Bio


My research and teaching interests include Climate Dynamics, Oceanography, Marine Ecology, and Biogeochemistry. I am interested in environmental policy directed towards problem-solving. My research group studies global environmental change with a focus on air-sea interactions, tropical marine ecosystems, polar climate, and biogeochemistry. In October, 2001, I became the founding director of the Interdisciplinary Graduate Program in Environment and Resources (now E-IPER), a position I maintained until 2005. In January, 2003, I was appointed the Victoria P. and Roger W. Sant Director of the Earth Systems Program, the largest undergraduate and co-terminal masters program in the School of Earth Sciences, an appointment that ran through 2012. In January, 2004, I was named the J. Frederick and Elisabeth B. Weintz University Fellow in Undergraduate Education in recognition of teaching and mentoring of Stanford undergraduate students. I was awarded the William M. Keck Professorship in 2008, the same year that I moved from the Department of Geological and Environmental Sciences to the newly created Department of Environmental Earth System Science. In 2009, I was elected as a Trustee for the Consortium for Ocean Leadership in Washington D.C. where I am active in promoting the Integrated Ocean Drilling Program and the Ocean Observatories Initiative. I am currently serving as the Chairperson of OL’s Board of Trustees. In 2004 I helped start the Palmyra Atoll Research Consortium (PARC) to promote research and conservation of Pacific coral reefs.

Academic Appointments


Administrative Appointments


  • Chairman of the Board of Trustees, Consortium for Ocean Leadership (2013 - Present)
  • Adjunct Professor Victoria, University of Wellington, New Zealand (2010 - Present)
  • Trustee, Consortium for Ocean Leadership (2009 - Present)
  • W.M. Keck Sr. Professor of Earth Sciences, Stanford University (2008 - Present)
  • Professor of Environmental Earth System Science, Stanford University (2007 - Present)
  • Senior Fellow, Woods Institute for the Environment, Stanford University (2004 - Present)
  • J. Frederick and Elisabeth B. Weintz University Fellow in Undergraduate Education, Stanford University (2004 - Present)
  • Victoria P. and Roger W. Sant Director of the Earth Systems Program, Stanford University (2003 - 2012)
  • Founding Director, Interdisciplinary Graduate Program in Environment and Resources, Stanford University (2001 - 2005)
  • Associate Chair, Geological and Environmental Sciences, Stanford University (2000 - 2004)
  • Senior Fellow Freeman Spogli Institute of International Studies, Stanford University (1998 - 2010)
  • Professor of Geological and Environmental Sciences, Stanford University (1997 - 2007)
  • Adjunct Professor of Geology and Geophysics, Rice University (1997 - 2004)
  • Professor of Geology and Geophysics, Rice University (1994 - 1997)
  • Visiting Scientist, National Geophysical Data Center (1994 - 1996)
  • Master of Baker College, Rice University (1989 - 1994)
  • Visiting Scientist, Geology Department, University of New Mexico, Albuquerque, New Mexico (1988 - 1988)
  • Visiting Research Fellow, School of Earth Sciences, Victoria University of Wellington, New Zealand (1988 - 1988)
  • Assistant/Associate Professor of Geology, Rice University (1982 - 1994)
  • Visiting Assistant Professor of Earth Sciences, University of California, San Diego (1981 - 1982)
  • Lecturer in Earth Sciences, University of California, San Diego (1979 - 1980)

Honors & Awards


  • TED Speaker, TED (Technology, Entertainment, Design) (2010)
  • Richard W. Lyman Award, Stanford University (2009)
  • W.M. Keck Sr. Professorship in Earth Sciences, Stanford University (2008)
  • J. Frederick and Elisabeth Brewer Weintz University Fellowship, Stanford University (2004)
  • S.T. Lee Lecturer in Antarctic Studies, Victoria University of Wellington, New Zealand (2003)
  • Best Paper Award, Coral Reefs Journal, 1995, International Society for Reef Studies (1996)
  • Antarctic Service Medal, The United States of America (1988)

Boards, Advisory Committees, Professional Organizations


  • Participant and Writer, Scientific Committee on Antarctic Research Horizon Scan (2014 - Present)
  • Chair, Board of Trustees, Consortium for Ocean Leadership (2013 - Present)
  • Committee Member, NAS/NRC Panel on "Future Science Opportunities in the Antarctic and Southern Ocean" (2013 - Present)
  • Member, Audit Committee, Consortium for Ocean Leadership (2013 - Present)
  • Re-elected to Board of Trustees, Consortium for Ocean Leadership (2012 - Present)
  • Member, HOLOCLIP project team, European Union (2011 - Present)
  • Member, Coral Reefs and Climate Change Working Group, Center for Ocean Solutions (2011 - Present)
  • Mentor, Jefferson High School Science Teacher, NASA Mentoring Program, Stanford University (2011 - Present)
  • Member, Working Group on Sea Level Rise and the Pacific Small Island and Developing States, Earth Justice and U.N. Foundation (2010 - Present)
  • Member, Sample Allocation Committee, IODP Expedition 318 (2010 - Present)
  • Member, Vice-Provost’s “critical engagement” focus group, Stanford University (2010 - Present)
  • Trustee, Trustee, Consortium for Ocean Leadership (2009 - Present)
  • Chair, Palmyra Atoll Research Consortium Finance Commitee (2008 - Present)
  • Member, Center for Ocean Solutions Management Committee (2008 - Present)
  • Proponent and Shipboard Participant, Integrative Ocean Drilling Program Expedition 318 to Antarctica (2008 - Present)
  • Stanford representative, Consortium for Ocean Leadership (2007 - Present)
  • Member, Palmyra Atoll Consortium Leadership Committee (2003 - Present)
  • Academic advisor to 19 Earth Systems students, 3 GES, and 2 IDM undergraduates, Stanford University (1998 - Present)
  • Chair, Ad-hoc committee on development of Oceans curricular track, Stanford University (1998 - Present)
  • Director, Stable Isotope Biogeochemistry Lab, Stanford University (1998 - Present)
  • Lead adviser to 24 M.S. or Ph.D. students, Stanford University (1997 - Present)
  • Invited Speaker, NASA/GISS (2013 - 2013)
  • U.S. Member, Science Implementation and Planning Committee, (SIPCOM),Intergated Ocean Drilling Program (2012 - 2014)
  • Co-Leader, GSA/UT Austin Geologic Field Trip to Antarctica (2012 - 2013)
  • Invited Plenary Speaker, 5th Scientific Committee on Antarctic Research Open Sciences Conference (2012 - 2012)
  • Invited participant, US-Korean-Italian Workshop on Time Series Observation in the Ross Sea, Incheon, Korea (2012 - 2012)
  • Invited speaker, SETI Institute (2012 - 2012)
  • Keynote speaker, Ecopoesis Conference, California College of the Arts (2012 - 2012)
  • Keynote speaker, UC Davis Graduate Ecology Symposium (2012 - 2012)
  • Member, Past Antarctic Ice Sheet Dynamics (PAIS) development team, Scientific Committee on Antarctic Research (2012 - 2012)
  • Chair, Public Policy Committee, Consortium for Ocean Leadership (2011 - 2013)
  • Member, Committee on Undergraduate Standards and Policy (C-USP), Stanford University (2011 - 2013)
  • Member, Faculty Search Committee for an appointment to “The Douglas Chair”, Stanford University (2011 - 2013)
  • Vice-Chair, Board of Trustees, Consortium for Ocean Leadership (2011 - 2013)
  • Coordinator, EESS weekly seminar series for Spring, 2012, Stanford University (2011 - 2012)
  • Invited Speaker, Northern Illinois University, Livermore Valley Association, Kennedy Middle School (2011 - 2011)
  • Session Chair and Keynote Speaker, International Symposium on Antarctic Earth Sciences, Edinburgh (2011 - 2011)
  • U.S. Member, Science Planning Committee (SPC), Intergated Ocean Drilling Program (2011 - 2011)
  • Chair, Scientific Ocean Drilling Subcommittee, Consortium for Ocean Leadership (2010 - 2013)
  • Member, Advisory Board, Haas Center for Public Service, Stanford University (2010 - 2013)
  • Member, Freshman and Sophomore Programs Advisory Committee, Stanford University (2010 - 2013)
  • Chair, NSF-UNOLS Polar Research Vessel Committee (2010 - 2012)
  • Member, New Ship Acquisition and Funding Committee, Consortium for Ocean Leadership (2010 - 2012)
  • Mentor of Middle School Science Teacher through NASA Mentoring Program, Stanford University (2010 - 2011)
  • Invited Participant, US-Italian Workshop on Time Series Observation in the Ross Sea, Ischia Italy (2010 - 2010)
  • Invited Speaker, Victoria University of Wellington, New Zealand, Los Altos Earth Day Event, Bohemian Grove, Steve Schneider Symposium (Monterey), Cal Academy of Arts and Sciences, Ocean Leadership (DC) (2010 - 2010)
  • Invited Speaker, TED Mission Blue (2010 - 2010)
  • Member, Visiting Review Committee, Ocean Sciences Program, Texas A&M University, Corpus Christi (2010 - 2010)
  • Presenter, Woods Institute, Oceans Salon, California Academy of Sciences (2010 - 2010)
  • Member, Committee of Visitors evaluating Office of Polar Programs at the US National Science Foundation (2009 - 2010)
  • Member, Committee of Visitors, Public evaluation of effectiveness of Office of Polar Research, US National Science Foundation (2009 - 2010)
  • Member, External Revue Panel, Department of Marine Sciences, University of Otago, Dunedin, New Zealand (2009 - 2010)
  • Member, Faculty Search Committee for Director of Center for Ocean Solutions, Stanford University (2009 - 2010)
  • Invited Lecturer, Stanford University, IAEA ENSO Workshop, Lima , Peru, ACE Science Conference, Granada, Spain, ANDRILL Workshop, Wellington, New Zealand, SF Exploratorium, Stanford Club of Monterey (2009 - 2009)
  • Invited Participant, INVEST Workshop on the Future of Ocean Drilling (2009 - 2009)
  • Member, Program Committee, Antarctic Climate Evolution Conference, Granada, Spain (2009 - 2009)
  • Member, Visiting Review Committee, Department of Marine Sciences, University of Otago, Dunedin, New Zealand (2009 - 2009)
  • Member, Visiting Review Committee, Oceanography Department, Texas A&M University, College Station, Texas (2009 - 2009)
  • Participant, McMurdo Ice Shelf Drilling Project Workshop, Wellington, New Zealand (2009 - 2009)
  • Speaker, Oceans Forum, Copenhagen Conference on Climate Change (COP-15) (2009 - 2009)
  • Member, Y2E2 Building Management Committee, Stanford University (2008 - 2012)
  • Member, Faculty Search Committee in area of Chemical Oceanography, Stanford University (2008 - 2010)
  • Member, External Revue Panel, College of Geoscience, Oceanography Department Texas A&M University (2008 - 2009)
  • Invited Lecturer, Stanford University, for Stanford Development Office (events in NYC and LA), San Francisco State University, British Antarctic Survey, SCAR-OSC, St. Petersburg, Russia (2008 - 2008)
  • Invited Speaker Stanford Admit Weekend, Stanford University (2008 - 2008)
  • Invited Speaker, Stanford Parents Day, Stanford University (2008 - 2008)
  • Peer Review Team Member, Department of Oceanography, Texas A&M University (2008 - 2008)
  • Member, Program Committee, 2008 SCAR Open Sciences Congress, St. Petersburg (2007 - 2008)
  • Chief Scientist, Deep Sea Coral Collectiion by Submersibles, RV KOK, Pisces V 2007 | Leader, Coral Coring expedition to Palmyra (2007 - 2007)
  • Co-Chief Scientist, Stanford@SEA, RV Robert Seamans (2007 - 2007)
  • Expert Panelist, Site visit for Foundation for Research, Science, and Technology review of Crown Research Institutes, New Zealand (2007 - 2007)
  • Invited Lecturer, University of Toronto, The Nature Conservancy, Australian National University, Stanford University (2007 - 2007)
  • Invited Speaker, Stanford Homecoming (2007 - 2007)
  • Invited Speaker, Stanford Admit Weekend, Stanford University (2007 - 2007)
  • Member, Woods Institute Research Committee (2007 - 2007)
  • Participant, Southern McMurdo Sound ANDRILL Project (2007 - 2007)
  • Invited Speaker, Stanford Parents Day, Stanford University (2006 - 2007)
  • Member, Search Committee for a faculty hire in Physical Oceanography, Stanford University (2006 - 2007)
  • Off-ice designated scientist, ANDRILL McMurdo Ice Shelf Project (2006 - 2007)
  • Scientist, Marine Biology, Biogeochemistry, and Ocean Physics, Ross Sea, Antarctica, R/V Nathaniel Palmer (2006 - 2007)
  • Faculty Leader, Stanford Travel Study Trip to New Guinea, Stanford University (2006 - 2006)
  • Invited Lecturer, U.S. Geological Survey, Hopkins Marine Station, University of Queensland, Australian National University (2006 - 2006)
  • Invited Speaker, End of Oil Symposium, Stanford (2006 - 2006)
  • Invited Speaker, Stanford Club of San Diego (2006 - 2006)
  • Invited Speaker, End of Oil Public Lecture Series, SES, Stanford University (2006 - 2006)
  • Keynote Plenary Speaker, SCAR Open Sciences Conference, Hobart, Australia (2006 - 2006)
  • Leader, IAEA sampling mission to Raja Ampat archipelago, West Papua, Indonesia (2006 - 2006)
  • Leader, Lake coring trip to Lago Fagnano, Tierra del Fuego, Argentina (2006 - 2006)
  • Member, American Geophysical Union Program Committee for 2006 Joint Meeting in Baltimore (2006 - 2006)
  • Member, Program Committee, 2006 SCAR (Scientific Committee for Antarctic Research) biannual Open Science Conference, Hobart Australia (2006 - 2006)
  • Plenary Speaker, SCAR Open Sciences Congress, Hobar (2006 - 2006)
  • Scientist, Coral Reef Control Volume Experiment, Heron Island, Australia (2006 - 2006)
  • Seminar speaker, Heron Island Marine Station, Australia, and at the University of Queensland, Brisbane, Australia (2006 - 2006)
  • Speaker, Stanford Alumni Clubs in San Diego, Los Angeles (2006 - 2006)
  • Elected Chair, International Atomic Energy Agency Cooperative Reserach Porject Isotopic Studies of El Nino (2005 - 2014)
  • Participant, ANDRILL (Antarctic Drilling) McMurdo Sound Drilling Program (2005 - 2013)
  • Co-Chair, Faculty search committee for a new hire in the area of Climate Science, Stanford University (2005 - 2009)
  • Chair, Antarctic Research Vessel Oversight Committee (2005 - 2008)
  • Member, AGU Program Committee, AGU 2006 Joint Meeting, Baltimore (2005 - 2006)
  • Scientist, Marine Biology, Biogeochemistry, and Ocean Physics, Ross Sea, Antarctica, R/V Nathaniel (2005 - 2006)
  • Chief Scientist, Deep submerisble diving expedition from Samoa to Hawaii (2005 - 2005)
  • Co-Chief Scientist, coral coring expedition to Palmyra Atoll, Stanford University (2005 - 2005)
  • Faculty Leader, Stanford Travel Study Trip to Antarctica, Stanford University (2005 - 2005)
  • Faculty Leader, Stanford Travel Study Trip to Russian Far East, Stanford University (2005 - 2005)
  • Invited Participant, East Antarctic Margin Drilling Workshop, Spoleto, Italy (2005 - 2005)
  • Invited Speaker, Stanford Club of Wyoming, Stanford Club of Monterey, Stanford Club of Philadelphia (2005 - 2005)
  • Invited Testimony, National Academy of Sciences Panel on future U.S. Polar Researh Vessel Needs (2005 - 2005)
  • Leader, Expedition to easter Island for coral coring and lake sediment coring (2005 - 2005)
  • Co-Chair, Interdisciplinary Grants Committee, Stanford's Institute for the Environment, Stanford University (2004 - 2006)
  • Member, Program Committee, 2008 SCAR Open Sciences Congress, Hobart, Australia (2004 - 2006)
  • Chair Science Committee, Palmyra Atoll Research Consortium (2004 - 2005)
  • Invited Participant, SCAR (Scientific Committee on Antarctic Research) meeting (2004 - 2005)
  • Member, Faculty search committee in the area of Paleobiology, Stanford University (2004 - 2005)
  • Chief Scientist, Deep submerisble diving in the Hawaiian Islands and at Cross Seamount, DSRV Pisces V and RV Kanaloa o Kamaikai (2004 - 2004)
  • Faculty Leader, Stanford Travel Study Trip to Alaska, Stanford University (2004 - 2004)
  • Invited Participant, SCAR (Scientific Committee on Antarctic Research) meeting, Bremen (2004 - 2004)
  • Invited Speaker, International Conference on Isotopes in Environmental Studies, Monoco (2004 - 2004)
  • Invited Speaker, Isotopes as climate tracers short course, IAEA, Trieste (2004 - 2004)
  • Lecturer, Instituto de Verano, Universidad de Concepcion, Chile (2004 - 2004)
  • Director, Earth Systems Program, Stanford University (2003 - 2012)
  • Faculty Leadership Committee, Stanford Institute for the Environment, Stanford University (2003 - 2009)
  • Member, Next Generation Polar Research Vessel Design Committee (2003 - 2008)
  • Governor, Joint Oceanographic Insitutions, Inc. (2003 - 2007)
  • Member. Scheduling Committee, AGU Ocean Sciences Meeting (2003 - 2004)
  • Faculty Leader, Stanford Travel Study Trip to Antarctica, Stanford University (2003 - 2003)
  • Invited Participant, Scientific Planning Committee, Integrated Ocean Drilling Program transition meeting, Sapporo (2003 - 2003)
  • Invited speaker, Holocene Climate Workshop, Eikom, Norway (2003 - 2003)
  • Leader, Lake coring team in Patagonia, Stanford University (2003 - 2003)
  • Member, Scientific Experts Group, IMAGES (2002 - 2008)
  • Member, Antarctic Research Vessel Oversight Committee (2002 - 2008)
  • Secretary, Paleoceanography and Paleoclimatology Focus Group, AGU (2002 - 2004)
  • Alternate Governor, Joint Oceanographic Institutions (2002 - 2003)
  • Chief Scientist, Marine Geology and Geophysics, Antarctic Peninsula, RV L.M. Gould (2002 - 2002)
  • Co-convener, IMAGES Southern Ocean Working Group conference, Barcelona, Spain (2002 - 2002)
  • Co-convener, IMAGES Southern Ocean Working Group conference II, Barcelona (2002 - 2002)
  • Invited Participant, National Science Foundation Earth System History RFP panel, Washington D.C. July (2002 - 2002)
  • Invited Participant, Antarctic Climate Evolution Data/Model Integration Workshop, Amherst, MA (2002 - 2002)
  • Invited Speaker, Climate Change in the Antarctic Peninsula Workshop, Hamilton, New York (2002 - 2002)
  • Invited participant, Conference on U.S. Participation (CUSP) in the Integrated Ocean Drilling Program, Washington D.C. (2002 - 2002)
  • Member of review panel, National Science Foundation Integrated Global C cycle (2002 - 2002)
  • Member, CEE faculty search committee, Stanford University (2002 - 2002)
  • Provost's Lecturer, SUNY Stony Brook (2002 - 2002)
  • Scientist, Deep submerisble diving expedition to the Gulf of Alaska, DSRV Alvin and RV Atlantis (2002 - 2002)
  • Scientist, Expedition to Eilat Israel to instrument coral reef for global change studies (2002 - 2002)
  • Director, Interdisciplinary Ph.D. Program in Environment and Resources, Stanford University (2001 - 2005)
  • Distinguished Lecture Speaker, Ocean Drilling Program: Portland State University, Columbus State University, SUNY Albany, Duke University, SUNY Stonybrook (2001 - 2002)
  • Co-convener, IMAGES Southern Ocean Working Group conference, Bremerhaven, June (2001 - 2001)
  • Convener, First ARTS (Annual Records of Tropical Systems) Open Science Meeting, Noumea, New Caledonia, November (2001 - 2001)
  • Invited Speaker, ANTOSTRAT symposium, Erice, Italy, September (2001 - 2001)
  • Member, Steering Committee, ACE (Antarctic Climate Evolution), a new SCAR project (2001 - 2001)
  • Member, American Geophysical Union Paleoceanography and Paleoclimatology Focus Group (2000 - 2008)
  • Associate Chair, Geological and Environmental Sciences, Stanford University (2000 - 2004)
  • Editor (with Jack Ditullio), American Geophysical Union, Antarctic Research Series monograph on Biogeochemistry of the Ross Sea Shelf (2000 - 2003)
  • Member, University Committee on Admissions and Financial Aid, Stanford University (2000 - 2003)
  • Elected representative, Academic Senate, Stanford University (2000 - 2002)
  • Chief Scientist, PISCO (Paleoenvironmental Investigations of Sediment in the Coastal Ocean), RVIB L.M. Gould, April/May (2000 - 2000)
  • Invited Speaker, University of California, Santa Barbara (2 talks); California Institute of Technology; University of California, Berkeley (2 talks), University of Idaho, Joint Global Ocean Flux Study Biogeochemistry Conference in Brest, France (2000 - 2000)
  • Invited participant and speaker, International Marine Geosciences Sampling (IMAGES) executive committee meeting, Woods Hole, MA; Shallow Water Drilling Workshop, St. Petersburg, FL; (2000 - 2000)
  • Session chair, Paleoclimate (2 sessions) (2000 - 2000)
  • Member, Earth Sciences Advisory Council, Stanford University (1999 - 2012)
  • Member, Provost's Committee on Environmental Science, Technology and Policy, Stanford University (1999 - 2008)
  • Leader, Annual Records of Tropical Systems (International Geosphere Biosphere Program IGBP/PAGES) (1999 - 2003)
  • Chair, Ion Microprobe Faculty Search Committee (1999 - 2000)
  • Invited Speaker, Gordon Conference on Polar Marine Processes, Ventura; Dean's Seminar Series, School of Earth Sciences, Stanford; Institute for the Study of Planet Earth, University of Arizona, Tuscon; Peninsula Geological Society Seminar Series, Stanford (1999 - 1999)
  • Invited participant and speaker, AESOPS Workshop, US Joint Global Ocean Flux Study, Keystone, Colorado, August (1999 - 1999)
  • Participant, Marine Geology and Geophysics cruise, Palmer Deep and Antarctic Peninsula, R/V Nathaniel B. Palmer March-April (1999 - 1999)
  • Session chair, COMPLEX workshop on the future of Ocean Scientific Drilling, Vancouver, Canada, May (1999 - 1999)
  • Member of CESP faculty (Center for Environmental Science and Policy), Stanford University (1998 - 2007)
  • Elected alternate representative, electoral unit 2, faculty senate, Stanford University (1998 - 1999)
  • Chief Scientist, ROAVERRS (Research on Ocean Atmosphere Variability and Ecosystem Response in the Ross Sea, RVIB N.B. Palmer, October-December, 1998) (1998 - 1998)
  • Co-leader, Submerged coral drilling, Galapagos Islands, RV Samba, June, 1998 (1998 - 1998)
  • Invited Speaker, American Quaternary Association Annual Meeting, Puerto Vallarta, Mexico; American Geophysical Union/American Society Limnology and Oceangraphy biennial meeting, San Diego; EastFest '98, Stanford; Stanford Parents Day Lectures; ENRON Corp (1998 - 1998)
  • Invited participant, PAGES Open Sciences Meeting, London; Sclerosponges as Paleoclimate indicators workshop, Miami (1998 - 1998)
  • Session organizer and chair, History of El Nio, PAGES Pole-Equator-Pole Americas Transect Workshop, Merida, Venezuela (1998 - 1998)
  • Earth Systems Program Steering Committee, Stanford University (1997 - 2012)
  • Graduate Student Admissions Committee, G&ES, Stanford University (1997 - 2000)
  • Executive Committee member, USSAC, the U.S. National Committee for Ocean Drilling (1997 - 1999)
  • Consulting member, search committee, New sedimentology faculty, Lehigh University (1997 - 1998)
  • Member, Oceans Faculty Search Committee, SES, Stanford University (1997 - 1998)
  • Chief Scientist Positions, ROAVERRS (Research on Ocean-Atmosphere Variability and Ecosystem Response in the Ross Sea), RVIB Palmer; Lake Titicaca piston coring, RV Neecho, May, 1997; Submersible Diving off Hawaii, RV Kaimikai O Kanaloa, DSRV Pisces V, Au (1997 - 1997)
  • Invited lecturer, Geophysical Fluid Dynamics Laboratory, Princeton; Princeton University, Department of Geology; Department of Mathematics and Applied Statistics, Rice University, Houston, Texas; Princeton University, Department of Ocean Sciences, UC San Diego (1997 - 1997)
  • Invited participant, Workshop on cross-validation of high-resolution climate proxies and instrument records, University of Washington; Warm Climates of the Tropics, International Center for Theoretical - Physics (ICTP), Trieste, Italy (1997 - 1997)
  • Leader, Research on Ocean/Atmosphere Variability and Ecosystem Response in the Ross Sea (ROAVERRS) Program (1996 - 2002)
  • Member, U.S. Science Advisory Council, Ocean Drilling Program (1996 - 1999)
  • Ocean Drilling Program Fellowship Proposal Review Panel, NSF-USSAC (1996 - 1998)
  • Co-leader, Annual Records of Tropical Systems Activity (PAGES) (1995 - 1998)
  • Member, steering committee, PEP-1 (Pole-Equator-Pole transects) (1995 - 1998)
  • Proposal Review Panel, Earth Systems History Program, NSF (1995 - 1997)
  • Committee Member, American Geophysical Union, Paleoceanography (1994 - 2000)

Professional Education


  • Ph.D., University of California, San Diego, Oceanography (1981)
  • B.S., University of Texas, Austin, Geology (1975)

Current Research and Scholarly Interests


Research

My group specializes in high resolution studies of climatic and oceanic variability during modern times as well as over the past 50 to 12,000 years. Our most productive archives for this work include the skeletons of long-lived corals from the tropics and the deep sea, as well as sediments from lakes and marine environments. We use chemical, isotopic, and morphological measurements of these materials to investigate the timing and rates of change associated with past climate and C cycle excursions. Current field areas include the American Samoa, Antarctica, the Line Islands, Easter Island, Chile, Patagonian Argentina, and Palau. We also collect deep sea corals to better understand their ecology as well as their self-contained records of change in the deep sea. We do this work using deep diving research submersibles in the Gulf of Alaska and the central tropical and north Pacific. We dive with the Hawaii Undersea Research Lab, using their two submersibles Pisces IV and Pisces V. We are currently working on several projects in Antarctica to assess the impacts of climate change on Southern Ocean ecosystems and C-system chemistry. Much of this work focuses on the Ross Sea where we are studying the modern uptake of carbon dioxide by the ocean and the sensitivity of primary production to changes in nutrients, temperature, sea ice cover, and CO2. We are also using sediment cores from fjords and shelf basins of East Antarctica and the Antarctic Peninsula to study past and changes in the Antarctic Ice Sheet. My lab participated in the ANDRILL program as shore-based and field-based scientists exploring the history of Antarctic climate at Windless Bight (McMurdo Ice Shelf Drilling) and Southern McMurdo Sound. I am also a proponent and participant on the 2010IODP Expedition 318 to Wilkes Land, Antarctica.

We have recently engaged in an extensive collaboration with colleagues in Civil and Environmental Engineering at Stanford to develop instrumentation and methodologies for directly measuring C system transformations (production/ respiration and calcification/ dissolution) in coastal marine systems. We are instrumenting coral reefs at several Pacific locations as well as a kelp forest in Monterey Bay. In parallel with our studies of field-scale variability in carbon system chemistry we have also been engaged in a series of efforts to understand the controls on carbonate biomineralization in organisms ranging from reef-building corals to clams from the deep sea. We hope that a better understanding of this process leads to better predictions for the impact of global environmental change on marine organisms.

Teaching

I teach both undergraduate and graduate courses in climate and global change, geochemistry, oceanography, marine geology, and paleoclimatology. I am particularly intrigued with teaching in the field and have taken over 250 Stanford students to remote locations such as Antarctica and the Line Islands to participate in educational and research expeditions.

Projects


  • Understanding Coral Reef Resilience to Advance Science and Conservation

    Location

    Palmyra Atoll

  • Collaborative Research: Developing a Continuous Reconstruction of Tropical Pacific Climate over the Last 500-700 Years: Analysis of Massive Porites Corals from American Samoa

    Location

    American Samoa

  • Collaborative Research: TRacing the fate of Algal Carbon Export in the Ross Sea (TRACERS)

    Location

    Ross Sea, Antarctica

  • Collaborative Research: An Ultra-High Resolution Holocene Climate Record from a Varved Sediment Sequence from the Adelie Coast, Antarctica (IODP Exp 318)

    Location

    Adelie Land, Antarctica

  • How marine species affect ocean acidification: the other side of the coin

    Location

    American Samoa

  • Holocene Climate Change in Southwestern Patagonia: New Insights from Large Lake Paleolimnology

    Location

    Puerto Natales, Chile

  • Observations and modeling of the C system dynamics at Palmyra Atoll: In support of the development of management strategies for ocean acidification impacts in the tropics

    Location

    Palmyra Atoll

  • Research Project, Stanford

    Location

    line islands

  • Research project, Stanford

    Location

    Chile

  • Research project, Stanford

    Location

    Patagonia Argentina

  • Research project, Stanford

    Location

    Tierra del Fuego

  • Research project, Stanford

    Location

    Palau

2014-15 Courses


Journal Articles


  • Identification of frequent La Nina events during the early 1800s in the east equatorial Pacific GEOPHYSICAL RESEARCH LETTERS Druffel, E. R., Griffin, S., Vetter, D., Dunbar, R. B., Mucciarone, D. M. 2015; 42 (5): 1512-1519
  • Environmental and ecological controls of coral community metabolism on Palmyra Atoll CORAL REEFS Koweek, D., Dunbar, R. B., Rogers, J. S., Williams, G. J., Price, N., Mucciarone, D., Teneva, L. 2015; 34 (1): 339-351
  • Long-range atmospheric transport of persistent organic pollutants to remote lacustrine environments. The Science of the total environment Ruiz-Fernández, A. C., Ontiveros-Cuadras, J. F., Sericano, J. L., Sanchez-Cabeza, J., Liong Wee Kwong, L., Dunbar, R. B., Mucciarone, D. A., Pérez-Bernal, L. H., Páez-Osuna, F. 2014; 493: 505-520

    Abstract

    Concentrations, temporal trends and fluxes of persistent organic pollutants (POPs: PAHs, PCBs and PBDEs) were determined in soil and (210)Pb-dated sediment cores from remote lacustrine environments (El Tule and Santa Elena lakes) in rural areas of Central Mexico. In both areas, the concentrations of target analytes in soil and sediment samples were comparable and indicative of slightly contaminated environments. The prevalence of low-molecular-weight PAHs in soils suggested their mainly atmospheric origin, in contrast to the aquatic sediments where runoff contribution was also significant. Increasing contamination trends of PCBs and PBDEs were evident, showing maximum fluxes of 4.8±2.1 and 0.3±0.1ngcm(-2)a(-1) for PCBs and PBDEs, respectively. The predominance of lower-brominated PBDEs and lower-chlorinated PCBs in soils and sediments indicated that their presence is mostly due to long-range atmospheric transport.

    View details for DOI 10.1016/j.scitotenv.2014.05.002

    View details for PubMedID 24971459

  • A 215-yr coral delta O-18 time series from Palau records dynamics of the West Pacific Warm Pool following the end of the Little Ice Age CORAL REEFS Osborne, M. C., Dunbar, R. B., Mucciarone, D. A., Druffel, E., Sanchez-Cabeza, J. 2014; 33 (3): 719-731
  • Oxygen and carbon isotope fractionation in calcitic deep-sea corals: Implications for paleotemperature reconstruction CHEMICAL GEOLOGY Kimball, J. B., Dunbar, R. B., Guilderson, T. P. 2014; 381: 223-233
  • Seasonal radiocarbon and oxygen isotopes in a Galapagos coral: Calibration with climate indices GEOPHYSICAL RESEARCH LETTERS Druffel, E. R., Griffin, S., Glynn, D. S., Dunbar, R. B., Mucciarone, D. A., Toggweiler, J. R. 2014; 41 (14): 5099-5105
  • (submitted) Nature's last stand: Locating and protecting the planet's most remote and biodiverse sites Nature McCauley, D. J., , D. J., McInturf, A., , A., Young, H. S., , H. S., Dunbar, R. B., , R. B., Hastie, T., , T., Mazumder, R., , R., Viladomat, J., , J., Dirzo, R., , R., Micheli, F., F. 2014
  • (submitted) 32Si dating of the upper Adelie Drift sediment core U1357C to resolve the 14C reservoir age Geochimica Cosmochimica Acta Morgenstern, U., Dunbar, R., Ditchburn, R., McKay, R., Crosta, X., Masse, G., Elod, J., Jimenez-Espejo, F., Escutia, C. 2014
  • (submitted) Seasonal radiocarbon and oxygen isotopes in a Galapagos coral: Calibration with climate indices Geophysical Research Letters Druffel, E., Griffin, S., Glynn, D., Dunbar, R., Mucciarone, D. 2014
  • A 215 year coral δ18O time series from Palau records dynamics of the West Pacific Warm Pool (WPWP) following the end of the Little Ice Age (LIA) Coral Reefs Osborne, M., Dunbar, R., Mucciarone, D., Druffel, E., Sanchez-Cabeza, J. 2014
  • (In Press) Dynamic coral community metabolism and its controls on Palmyra Atoll Coral Reefs Koweek, D., Dunbar, R. B., Rogers, J., Williams, G., Price, N., Mucciarone, D., Teneva, L. 2014
  • (submitted) Reef exposure metrics of environmental stress based on diel and seasonal trends in carbonate chemistry and temperature PLOS ONE Kline, D., Teneva, L., Schneider, K., Hauri, C., Miard, T., Chai, A., Marker, M., Dunbar, R., Caldeira, K., Lazar, B., Rivlin, T., Mitchell, B., Dove, S., Hoegh-Guldberg, O. 2014
  • Pushing back against paper-park pushers – Reply to Craigie et al. Biological Conservation McCauley, D., Power, E., Bird, D., Dunbar, R., Durham, W., Micheli, F., Young, H. 2014; 173
  • (submitted) Biological controls on coral reef seawater chemistry and potential capacity for offsetting future ocean acidification Limnology and Oceanography Teneva, L., Dunbar, R., Koweek, D., Mucciarone, D. 2014
  • (In Press) A community-based reconstruction of Antarctic Ice Sheet deglaciation since the Last Glacial Maximum Quaternary Science Reviews Bentley, M., Consortium, R., Dunbar, R. 2014
  • (In Press) Compound-specific 14C dating of IODP Expedition 318 Core 1357A obtained off the Wilkes Land Coast, Antarctica Radiocarbon Yamane, Y., Yokoyama, Y., Miyairi, Y., Suga, H., Matsuzaki, H., Dunbar, R., Ohkouchi, N. 2014
  • Conservation management options and actions: Putative decline of coral cover at Palmyra Atoll, Northern Line Islands, as a case study Marine Pollution Bulletin Gardner, J., Bartz, J., Brainard, R., Collen, J., Dunbar, R., Garton, D., Powell, S. 2014
  • (In Press) Underwater elephants: functionally important species and the importance of ecosystem functioning Conservation Biology McCauley, D. J., Young, H. S., Guevara, R., Power , E., Dunbar, R. B., Bird, D., Durham , W., Williams, G. J., Micheli, F. 2014
  • Retreat history of the East Antarctic Ice Sheet since the Last Glacial Maximum Quaternary Science Reviews Mackintosh, A. N., Verleyen, E., O’Brien, P. E., White, D., McKay, R., Gore, D. B., Dunbar, R. B., Fink, D., Jones, R. S., Post, A. L., Miura, H., Leventer, A., Goodwin, I., Lilly, K., Crosta, X., Golledge, N., Wagner, B., Berg, S., van Ommen, T., Zwartz, D., Hodgson, D. A., Roberts, S. J., Vyverman, W., Masse, G. 2014; 85
  • Oxygen and carbon isotope fractionation in calcitic deep-sea corals: Implications for paleotemperature reconstruction Chemical Geology Kimball, J. B., Dunbar, R. B., Guilderson, T. P. 2014; 381: 223-233
  • (in Press) Long-range atmospheric transport of persistent organic pollutants to remote lacustrine environments Science of the Total Environment Ruiz-Fernández, A. C., Ontiveros-Cuadras, J. F., Luis Sericano, J., Sánchez-Cabeza, J. A., Wee-Kwon, L. L., Dunbar, R. B., Mucciarone, D., Pérez-Bernal, H. L., Páez-Osuna, F. 2014
  • Regional calibration of coral-based climate reconstructions from Palau, West Pacific Warm Pool (WPWP) PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY Osborne, M. C., Dunbar, R. B., Mucciarone, D. A., Sanchez-Cabeza, J., Druffel, E. 2013; 386: 308-320
  • High-resolution carbon budgets on a Palau back-reef modulated by interactions between hydrodynamics and reef metabolism LIMNOLOGY AND OCEANOGRAPHY Teneva, L., Dunbar, R. B., Mucciarone, D. A., Dunckley, J. F., Koseff, J. R. 2013; 58 (5): 1851-1870
  • delta N-15 values of settling biogenic particles in the eastern Bransfield Basin (west Antarctic) and their records for the surface-water condition GEOSCIENCES JOURNAL Khim, B., Dunbar, R., Kim, D. 2013; 17 (3): 255-265
  • Conservation at the edges of the world BIOLOGICAL CONSERVATION McCauley, D. J., Power, E. A., Bird, D. W., McInturff, A., Dunbar, R. B., Durham, W. H., Micheli, F., Young, H. S. 2013; 165: 139-145
  • Spatial and temporal variations in variable fluoresence in the Ross Sea (Antarctica): Oceanographic correlates and bloom dynamics DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS Smith, W. O., Tozzi, S., Long, M. C., Sedwick, P. N., Peloquin, J. A., Dunbar, R. B., Hutchins, D. A., Kolber, Z., DiTullio, G. R. 2013; 79: 141-155
  • Bacterial abundance and composition in marine sediments beneath the Ross Ice Shelf, Antarctica GEOBIOLOGY Carr, S. A., Vogel, S. W., Dunbar, R. B., Brandes, J., Spear, J. R., Levy, R., Naish, T. R., Powell, R. D., Wakeham, S. G., Mandernack, K. W. 2013; 11 (4): 377-395

    Abstract

    Marine sediments of the Ross Sea, Antarctica, harbor microbial communities that play a significant role in the decomposition, mineralization, and recycling of organic carbon (OC). In this study, the cell densities within a 153-cm sediment core from the Ross Sea were estimated based on microbial phospholipid fatty acid (PLFA) concentrations and acridine orange direct cell counts. The resulting densities were as high as 1.7 × 10⁷ cells mL⁻¹ in the top ten centimeters of sediments. These densities are lower than those calculated for most near-shore sites but consistent with deep-sea locations with comparable sedimentation rates. The δ¹³C measurements of PLFAs and sedimentary and dissolved carbon sources, in combination with ribosomal RNA (SSU rRNA) gene pyrosequencing, were used to infer microbial metabolic pathways. The δ¹³C values of dissolved inorganic carbon (DIC) in porewaters ranged downcore from -2.5‰ to -3.7‰, while δ¹³C values for the corresponding sedimentary particulate OC (POC) varied from -26.2‰ to -23.1‰. The δ¹³C values of PLFAs ranged between -29‰ and -35‰ throughout the sediment core, consistent with a microbial community dominated by heterotrophs. The SSU rRNA gene pyrosequencing revealed that members of this microbial community were dominated by β-, δ-, and γ-Proteobacteria, Actinobacteria, Chloroflexi and Bacteroidetes. Among the sequenced organisms, many appear to be related to known heterotrophs that utilize OC sources such as amino acids, oligosaccharides, and lactose, consistent with our interpretation from δ¹³CPLFA analysis. Integrating phospholipids analyses with porewater chemistry, δ¹³CDIC and δ¹³CPOC values and SSU rRNA gene sequences provides a more comprehensive understanding of microbial communities and carbon cycling in marine sediments, including those of this unique ice shelf environment.

    View details for DOI 10.1111/gbi.12042

    View details for Web of Science ID 000320552800006

    View details for PubMedID 23682649

  • Reorganization of Southern Ocean plankton ecosystem at the onset of Antarctic glaciation. Science Houben, A. J., Bijl, P. K., Pross, J., Bohaty, S. M., Passchier, S., Stickley, C. E., Röhl, U., Sugisaki, S., Tauxe, L., van de Flierdt, T., Olney, M., Sangiorgi, F., Sluijs, A., Escutia, C., Brinkhuis, H., Dotti, C. E., Klaus, A., Fehr, A., Williams, T., Bendle, J. A., Carr, S. A., Dunbar, R. B., Flores, J., Gonzàlez, J. J., Hayden, T. G., Iwai, M., Jimenez-Espejo, F. J., Katsuki, K., Kong, G. S., McKay, R. M., Nakai, M., Pekar, S. F., Riesselman, C., Sakai, T., Salzmann, U., Shrivastava, P. K., Tuo, S., Welsh, K., Yamane, M. 2013; 340 (6130): 341-344

    Abstract

    The circum-Antarctic Southern Ocean is an important region for global marine food webs and carbon cycling because of sea-ice formation and its unique plankton ecosystem. However, the mechanisms underlying the installation of this distinct ecosystem and the geological timing of its development remain unknown. Here, we show, on the basis of fossil marine dinoflagellate cyst records, that a major restructuring of the Southern Ocean plankton ecosystem occurred abruptly and concomitant with the first major Antarctic glaciation in the earliest Oligocene (~33.6 million years ago). This turnover marks a regime shift in zooplankton-phytoplankton interactions and community structure, which indicates the appearance of eutrophic and seasonally productive environments on the Antarctic margin. We conclude that earliest Oligocene cooling, ice-sheet expansion, and subsequent sea-ice formation were important drivers of biotic evolution in the Southern Ocean.

    View details for DOI 10.1126/science.1223646

    View details for PubMedID 23599491

  • The roles of productivity and ecosystem size in determining food chain length in tropical terrestrial ecosystems ECOLOGY Young, H. S., McCauley, D. J., Dunbar, R. B., Hutson, M. S., Ter-Kuile, M., Dirzo, R. 2013; 94 (3): 692-701

    Abstract

    Many different drivers, including productivity, ecosystem size, and disturbance, have been considered to explain natural variation in the length of food chains. Much remains unknown about the role of these various drivers in determining food chain length, and particularly about the mechanisms by which they may operate in terrestrial ecosystems, which have quite different ecological constraints than aquatic environments, where most food chain length studies have been thus far conducted. In this study, we tested the relative importance of ecosystem size and productivity in influencing food chain length in a terrestrial setting. We determined that (1) there is no effect of ecosystem size or productive space on food chain length; (2) rather, food chain length increases strongly and linearly with productivity; and (3) the observed changes in food chain length are likely achieved through a combination of changes in predator size, predator behavior, and consumer diversity along gradients in productivity. These results lend new insight into the mechanisms by which productivity can drive changes in food chain length, point to potential for systematic differences in the drivers of food web structure between terrestrial and aquatic systems, and challenge us to consider how ecological context may control the drivers that shape food chain length.

    View details for Web of Science ID 000317044300016

    View details for PubMedID 23687895

  • Relative sea-level rise around East Antarctica during Oligocene glaciation Nature Geoscience Stocchi, P., Escutia, C., Houben, A.J.P., Vermeersen, B.L.A., Bijl, P.K., Brinkhuis, H., DeConto, R.M., Galeotti, S., Passchier, S., Pollard, D., Klaus, A., Fehr, A., Williams, T., Bendle, J.A.P., Bohaty, S.M., Carr, S.A., Dunbar, R.B., Flores, J.A., et al. 2013; 6: 380-384

    View details for DOI 10.1038/ngeo1783

  • Early Bomb Radiocarbon Detected in Palau Archipelago Corals Radiocarbon Glynn, D., Druffel, E., Griffin, S., Dunbar, R., Osborne, M., Sanchez-Cabeza, J. 2013
  • EARLY BOMB RADIOCARBON DETECTED IN PALAU ARCHIPELAGO CORALS RADIOCARBON Glynn, D., Druffel, E., Griffin, S., Dunbar, R., Osborne, M., Sanchez-Cabeza, J. A. 2013; 55 (2-3): 1659-1664
  • Late Holocene variations in Pacific surface circulation and biogeochemistry inferred from proteinaceous deep-sea corals BIOGEOSCIENCES Guilderson, T. P., McCarthy, M. D., Dunbar, R. B., Englebrecht, A., Roark, E. B. 2013; 10 (9): 6019-6028
  • Reorganization of Southern Ocean Plankton Ecosystem at the Onset of Antarctic Glaciation Science Houben, A.J.P., Bijl, P.K., Pross, J., Bohaty, S.M., Passchier, S., Stickley, C.E., Röhl, U., Sugisaki, S., Tauxe, L., van de Flierdt, T., Olney, M., Sangiorgi, F., Sluijs, A., Escutia, C.and Brinkhuis, H., Scientists, 3. 2013; 340: 341-344

    View details for DOI 10.1126/science.1223646

  • High-resolution carbon budgets on a Palau back-reef modulated by interactions between hydrodynamics and reef metabolism: insights for ocean acidification impacts Limnology and Oceanography Teneva, L., Dunckley, J. F., Dunbar, R. B., Mucciarone, D. A., Koseff, J. R. 2013; 58 (5): 1851-1870
  • Diatom evidence for the onset of Pliocene cooling from AND-1B, McMurdo Sound, Antarctica PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY Riesselman, C. R., Dunbar, R. B. 2013; 369: 136-153
  • Neogene tectonic and climatic evolution of the Western Ross Sea, Antarctica - Chronology of events from the AND-1B drill hole GLOBAL AND PLANETARY CHANGE Wilson, G. S., Levy, R. H., Naish, T. R., Powell, R. D., Florindo, F., Ohneiser, C., Sagnotti, L., Winter, D. M., Cody, R., Henrys, S., Ross, J., Krissek, L., Niessen, F., Pompillio, M., Scherer, R., Alloway, B. V., Barrett, P. J., Brachfeld, S., Browne, G., Carter, L., Cowan, E., Crampton, J., DeConto, R. M., Dunbar, G., Dunbar, N., Dunbar, R., von Eynatten, H., Gebhardt, C., Giorgetti, G., Graham, I., Hannah, M., Hansaraj, D., Harwood, D. M., Hinnov, L., Jarrard, R. D., Joseph, L., Kominz, M., Kuhn, G., Kyle, P., Laeufer, A., McIntosh, W. C., McKay, R., Maffioli, P., Magens, D., Millan, C., Monien, D., Morin, R., Paulsen, T., Persico, D., Pollard, D., Raine, J. I., Riesselman, C., Sandroni, S., Schmitt, D., Sjunneskog, C., Strong, C. P., Talarico, F., Taviani, M., Villa, G., Vogel, S., Wilch, T., Williams, T., Wilson, T. J., Wise, S. 2012; 96-97: 189-203
  • Assessing the effects of large mobile predators on ecosystem connectivity ECOLOGICAL APPLICATIONS McCauley, D. J., Young, H. S., Dunbar, R. B., Estes, J. A., Semmens, B. X., Michel, F. 2012; 22 (6): 1711-1717

    Abstract

    Large predators are often highly mobile and can traverse and use multiple habitats. We know surprisingly little about how predator mobility determines important processes of ecosystem connectivity. Here we used a variety of data sources drawn from Palmyra Atoll, a remote tropical marine ecosystem where large predators remain in high abundance, to investigate how these animals foster connectivity. Our results indicate that three of Palmyra's most abundant large predators (e.g., two reef sharks and one snapper) use resources from different habitats creating important linkages across ecosystems. Observations of cross-system foraging such as this have important implications for the understanding of ecosystem functioning, the management of large-predator populations, and the design of conservation measures intended to protect whole ecosystems. In the face of widespread declines of large, mobile predators, it is important that resource managers, policy makers, and ecologists work to understand how these predators create connectivity and to determine the impact that their depletions may be having on the integrity of these linkages.

    View details for Web of Science ID 000309437100001

  • A NEW US POLAR RESEARCH VESSEL FOR THE TWENTY-FIRST CENTURY OCEANOGRAPHY Dunbar, R. B., Alberts, J., Ashjian, C., Asper, V., Chayes, D., Domack, E., Ducklow, H., Huber, B., Lawver, L., Oliver, D., Russell, D., Smith, C. R., Vernet, M. 2012; 25 (3): 204-207
  • Seasonally laminated diatom-rich sediments from Dumont d'Urville Trough, East Antarctic Margin: Late-Holocene Neoglacial sea-ice conditions HOLOCENE Maddison, E. J., Pike, J., Dunbar, R. 2012; 22 (8): 857-875
  • Chronostratigraphic framework for the IODP Expedition 318 cores from the Wilkes Land Margin: Constraints for paleoceanographic reconstruction PALEOCEANOGRAPHY Tauxe, L., Stickley, C. E., SUGISAKI, S., Bijl, P. K., Bohaty, S. M., Brinkhuis, H., Escutia, C., Flores, J. A., Houben, A. J., Iwai, M., Jimenez-Espejo, F., McKay, R., Passchier, S., Pross, J., Riesselman, C. R., ROEHL, U., Sangiorgi, F., Welsh, K., Klaus, A., Fehr, A., Bendle, J. A., Dunbar, R., Gonzalez, J., Hayden, T., Katsuki, K., Olney, M. P., Pekar, S. F., Shrivastava, P. K., van de Flierdt, T., Williams, T., Yamane, M. 2012; 27
  • Resilience of cold-water scleractinian corals to ocean acidification: Boron isotopic systematics of pH and saturation state up-regulation GEOCHIMICA ET COSMOCHIMICA ACTA McCulloch, M., Trotter, J., Montagna, P., Falter, J., Dunbar, R., Freiwald, A., Foersterra, N., Lopez Correa, M., Maier, C., Ruggeberg, A., Taviani, M. 2012; 87: 21-34
  • A short-term in situ CO2 enrichment experiment on Heron Island (GBR) SCIENTIFIC REPORTS Kline, D. I., Teneva, L., Schneider, K., Miard, T., Chai, A., Marker, M., Headley, K., Opdyke, B., Nash, M., Valetich, M., Caves, J. K., Russell, B. D., Connell, S. D., Kirkwood, B. J., Brewer, P., Peltzer, E., Silverman, J., Caldeira, K., Dunbar, R. B., Koseff, J. R., Monismith, S. G., Mitchell, B. G., Dove, S., Hoegh-Guldberg, O. 2012; 2

    Abstract

    Ocean acidification poses multiple challenges for coral reefs on molecular to ecological scales, yet previous experimental studies of the impact of projected CO? concentrations have mostly been done in aquarium systems with corals removed from their natural ecosystem and placed under artificial light and seawater conditions. The Coral-Proto Free Ocean Carbon Enrichment System (CP-FOCE) uses a network of sensors to monitor conditions within each flume and maintain experimental pH as an offset from environmental pH using feedback control on the injection of low pH seawater. Carbonate chemistry conditions maintained in the -0.06 and -0.22 pH offset treatments were significantly different than environmental conditions. The results from this short-term experiment suggest that the CP-FOCE is an important new experimental system to study in situ impacts of ocean acidification on coral reef ecosystems.

    View details for DOI 10.1038/srep00413

    View details for Web of Science ID 000304394000002

    View details for PubMedID 22639723

  • From wing to wing: the persistence of long ecological interaction chains in less-disturbed ecosystems SCIENTIFIC REPORTS McCauley, D. J., DeSalles, P. A., Young, H. S., Dunbar, R. B., Dirzo, R., Mills, M. M., Micheli, F. 2012; 2

    Abstract

    Human impact on biodiversity usually is measured by reduction in species abundance or richness. Just as important, but much more difficult to discern, is the anthropogenic elimination of ecological interactions. Here we report on the persistence of a long ecological interaction chain linking diverse food webs and habitats in the near-pristine portions of a remote Pacific atoll. Using biogeochemical assays, animal tracking, and field surveys we show that seabirds roosting on native trees fertilize soils, increasing coastal nutrients and the abundance of plankton, thus attracting manta rays to native forest coastlines. Partnered observations conducted in regions of this atoll where native trees have been replaced by human propagated palms reveal that this complex interaction chain linking trees to mantas readily breaks down. Taken together these findings provide a compelling example of how anthropogenic disturbance may be contributing to widespread reductions in ecological interaction chain length, thereby isolating and simplifying ecosystems.

    View details for DOI 10.1038/srep00409

    View details for Web of Science ID 000304393800001

    View details for PubMedID 22624091

  • Antarctic and Southern Ocean influences on Late Pliocene global cooling PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA McKay, R., Naish, T., Carter, L., Riesselman, C., Dunbar, R., Sjunneskog, C., Winter, D., Sangiorgi, F., Warren, C., Pagani, M., Schouten, S., Willmott, V., Levy, R., DeConto, R., Powell, R. D. 2012; 109 (17): 6423-6428

    Abstract

    The influence of Antarctica and the Southern Ocean on Late Pliocene global climate reconstructions has remained ambiguous due to a lack of well-dated Antarctic-proximal, paleoenvironmental records. Here we present ice sheet, sea-surface temperature, and sea ice reconstructions from the ANDRILL AND-1B sediment core recovered from beneath the Ross Ice Shelf. We provide evidence for a major expansion of an ice sheet in the Ross Sea that began at ?3.3 Ma, followed by a coastal sea surface temperature cooling of ?2.5 °C, a stepwise expansion of sea ice, and polynya-style deep mixing in the Ross Sea between 3.3 and 2.5 Ma. The intensification of Antarctic cooling resulted in strengthened westerly winds and invigorated ocean circulation. The associated northward migration of Southern Ocean fronts has been linked with reduced Atlantic Meridional Overturning Circulation by restricting surface water connectivity between the ocean basins, with implications for heat transport to the high latitudes of the North Atlantic. While our results do not exclude low-latitude mechanisms as drivers for Pliocene cooling, they indicate an additional role played by southern high-latitude cooling during development of the bipolar world.

    View details for DOI 10.1073/pnas.1112248109

    View details for Web of Science ID 000303249100024

    View details for PubMedID 22496594

  • Radiocarbon and stable isotopes in Palmyra corals during the past century GEOCHIMICA ET COSMOCHIMICA ACTA Druffel-Rodriguez, K. C., Vetter, D., Griffin, S., Druffel, E. R., Dunbar, R. B., Mucciarone, D. A., Ziolkowski, L. A., Sanchez-Cabeza, J. 2012; 82: 154-162
  • Control of phytoplankton bloom inception in the Ross Sea, Antarctica, by Ekman restratification GLOBAL BIOGEOCHEMICAL CYCLES Long, M. C., Thomas, L. N., Dunbar, R. B. 2012; 26
  • Integrated biomagnetostratigraphy of the Wilkes Land Margin for reconstruction of 53 Ma of Antarctic Margin paleoceanography: New results from IODP Expedition 318 Paleoceanography Tauxe, L., Stickley, C., Sugisaki, S., Bijl, P., Bohaty, S., Brinkhuis, H., Escutia, C., Flores, J., Iwai, M., Jiménez-Espejo, F. J., McKay, R., Passchier, S., Pross, J., Riesselman, C., Roehl, U., Sangiorini, F., Welsh, K., Williams, T., Klaus, A., Fehr, A., Bendle, J., Dunbar, R., Gonzalez, J., Hayden, T., Olney, M., Pekar, S., Shrivastava, P., van de Flierdt, T., Yamane, M. 2012; 27

    View details for DOI 10.1029/2012PA002308

  • Seasonally-laminated diatom-rich sediments from Dumont d'Urville Trough, East Antarctic Margin: Late Holocene Neoglacial sea-ice conditions The Holocene Maddison, E. J., Pike, J., Leventer, A., Dunbar, R. 2012; 22: 1-19

    View details for DOI 10.1177/0959683611434223

  • Persistent near-tropical warmth on the Antarctic continent during the early Eocene epoch Nature Pross, J., Contreras, L., Bijl, P.K., Greenwood, D.R., Bohaty, S.M., Schouten, S., Bendle, J.A., Röhl, U., Tauxe, Dunbar, R., et. al. 2012; 488: 73-77
  • Early season depletion of dissolved iron in the Ross Sea polynya: Implications for iron dynamics on the Antarctic continental shelf JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Sedwick, P. N., Marsay, C. M., Sohst, B. M., Aguilar-Islas, A. M., Lohan, M. C., Long, M. C., Arrigo, K. R., Dunbar, R. B., Saito, M. A., Smith, W. O., DiTullio, G. R. 2011; 116
  • Effects of diagenesis on paleoclimate reconstructions from modern and young fossil corals GEOCHIMICA ET COSMOCHIMICA ACTA Sayani, H. R., Cobb, K. M., Cohen, A. L., Elliott, W. C., Nurhati, I. S., Dunbar, R. B., Rose, K. A., Zaunbrecher, L. K. 2011; 75 (21): 6361-6373
  • Vertical structure, seasonal drawdown, and net community production in the Ross Sea, Antarctica JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Long, M. C., Dunbar, R. B., Tortell, P. D., Smith, W. O., Mucciarone, D. A., DiTullio, G. R. 2011; 116
  • Holocene mass-wasting events in Lago Fagnano, Tierra del Fuego (54 degrees S): implications for paleoseismicity of the Magallanes-Fagnano transform fault BASIN RESEARCH Waldmann, N., Anselmetti, F. S., Ariztegui, D., Austin, J. A., Pirouz, M., Moy, C. M., Dunbar, R. 2011; 23 (2): 171-190
  • Retreat of the East Antarctic ice sheet during the last glacial termination NATURE GEOSCIENCE Mackintosh, A., Golledge, N., Domack, E., Dunbar, R., Leventer, A., White, D., Pollard, D., DeConto, R., Fink, D., Zwartz, D., Gore, D., Lavoie, C. 2011; 4 (3): 195-202

    View details for DOI 10.1038/NGEO1061

    View details for Web of Science ID 000287802300021

  • A geochemical and sedimentary record of high southern latitude Holocene climate evolution from Lago Fagnano, Tierra del Fuego EARTH AND PLANETARY SCIENCE LETTERS Moy, C. M., Dunbar, R. B., Guilderson, T. P., Waldmann, N., Mucciarone, D. A., Recasens, C., Ariztegui, D., Austin, J. A., Anselmetti, F. S. 2011; 302 (1-2): 1-13
  • The atmospheric lead record preserved in lagoon sediments at a remote equatorial Pacific location: Palmyra Atoll, northern Line Islands MARINE POLLUTION BULLETIN Collen, J. D., Baker, J. A., Dunbar, R. B., Rieser, U., Gardner, J. P., Garton, D. W., Christiansen, K. J. 2011; 62 (2): 251-257

    Abstract

    Anthropogenic lead (Pb) inputs to the atmosphere increased greatly over the past century and now dominate Pb supply to the oceans. However, the Pb content of sediments across the equatorial Pacific region is relatively unknown, and data exist only for deep sea sites where Pb deposition lags surface water inputs by up to a century. Here we present ICP-MS analyses of Pb of a core from a lagoon at Palmyra Atoll, northern Line Islands, that spans approximately the past 160 years. The non-bioturbated sediments of the euxinic lagoon, coupled with rapid rates of deposition, provide a unique fine-scale record of atmospheric Pb supply at a remote Pacific location. These first observations of historic Pb sedimentation in an atoll lagoon reveal a 63-fold increase in Pb flux to sediments during the past century and correlate directly with the North American consumption of leaded gasoline that began in 1926.

    View details for DOI 10.1016/j.marpolbul.2010.11.004

    View details for Web of Science ID 000288296400017

    View details for PubMedID 21094962

  • Early-season iron depletion in the Ross Sea polynya: Implications for iron dynamics on the Antarctic continental shelf Journal of Geophysical Research Sedwick, P. N., Marsay, C. M., Aguilar-Islas, A. M., Lohan, M. C., Sohst, B., Long, M. C., Arrigo, K. R., Bruland, K. W., DiTullio, G. R., Dunbar, R. B., Saito, M. A., Smith, W. O. 2011; 116

    View details for DOI 10.1029/2010JC006553

  • Iron limitation of a springtime bacterial and phytoplankton community in the Ross Sea: implications for vitamin B-12 nutrition FRONTIERS IN MICROBIOLOGY Bertrand, E. M., Saito, M. A., Lee, P. A., Dunbar, R. B., Sedwick, P. N., DiTullio, G. R. 2011; 2
  • Iron limitation of a springtime bacterial and phytoplankton community in the ross sea: implications for vitamin b(12) nutrition. Frontiers in microbiology Bertrand, E. M., Saito, M. A., Lee, P. A., Dunbar, R. B., Sedwick, P. N., DiTullio, G. R. 2011; 2: 160-?

    Abstract

    The Ross Sea is home to some of the largest phytoplankton blooms in the Southern Ocean. Primary production in this system has previously been shown to be iron limited in the summer and periodically iron and vitamin B(12) colimited. In this study, we examined trace metal limitation of biological activity in the Ross Sea in the austral spring and considered possible implications for vitamin B(12) nutrition. Bottle incubation experiments demonstrated that iron limited phytoplankton growth in the austral spring while B(12), cobalt, and zinc did not. This is the first demonstration of iron limitation in a Phaeocystis antarctica-dominated, early season Ross Sea phytoplankton community. The lack of B(12) limitation in this location is consistent with previous Ross Sea studies in the austral summer, wherein vitamin additions did not stimulate P. antarctica growth and B(12) was limiting only when bacterial abundance was low. Bottle incubation experiments and a bacterial regrowth experiment also revealed that iron addition directly enhanced bacterial growth. B(12) uptake measurements in natural water samples and in an iron fertilized bottle incubation demonstrated that bacteria serve not only as a source for vitamin B(12), but also as a significant sink, and that iron additions enhanced B(12) uptake rates in phytoplankton but not bacteria. Additionally, vitamin uptake rates did not become saturated upon the addition of up to 95 pM B(12). A rapid B(12) uptake rate was observed after 13 min, which then decreased to a slower constant uptake rate over the next 52 h. Results from this study highlight the importance of iron availability in limiting early season Ross Sea phytoplankton growth and suggest that rates of vitamin B(12) production and consumption may be impacted by iron availability.

    View details for DOI 10.3389/fmicb.2011.00160

    View details for PubMedID 21886638

  • Holocene climate variability at high-southern latitudes: an integrated perspective (HOLOCLIP) (not peer-reviewed) PAGES newsletter Stenni, B., Crosta, X., Oerter, H., Dotti, E. C., Renssen, H., Goosse, H., Pike, H., Dunbar, R. B. 2011; 19 (1): 37
  • Iron limitation of springtime bacterial and phytoplankton community in the Ross Sea: Implications for vitamin B12 nutrition Frontiers in Microbiology Bertrand, E. M., Saito, M. A., Lee, P. A., Dunbar, R. B., DiTullio, G. R. 2011; 2

    View details for DOI 10.3389/fmicb.2011.00160

  • Holocene climatic fluctuations and positioning of the Southern Hemisphere westerlies in Tierra del Fuego (54 degrees S), Patagonia JOURNAL OF QUATERNARY SCIENCE Waldmann, N., Ariztegui, D., Anselmetti, F. S., Austin, J. A., Moy, C. M., Stern, C., Recasens, C., Dunbar, R. B. 2010; 25 (7): 1063-1075

    View details for DOI 10.1002/jqs.1263

    View details for Web of Science ID 000283697100003

  • Stable isotope composition of dissolved inorganic carbon and particulate organic carbon in sea ice from the Ross Sea, Antarctica JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Munro, D. R., Dunbar, R. B., Mucciarone, D. A., Arrigo, K. R., Long, M. C. 2010; 115
  • Poleward decrease in the isotope effect of nitrate assimilation across the Southern Ocean GEOPHYSICAL RESEARCH LETTERS DiFiore, P. J., Sigman, D. M., Karsh, K. L., Trull, T. W., Dunbar, R. B., Robinson, R. S. 2010; 37
  • Uranium-series dating and growth characteristics of the deep-sea scleractinian coral: Enallopsammia rostrata from the Equatorial Pacific GEOCHIMICA ET COSMOCHIMICA ACTA Houlbreque, F., McCulloch, M., Roark, B., Guilderson, T., Meibom, A., Kimball, J., Mortimer, G., Cuif, J., Dunbar, R. 2010; 74 (8): 2380-2395
  • Interactive effects of iron, irradiance and CO2 on Ross Sea phytoplankton DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS Feng, Y., Hare, C. E., Rose, J. M., Handy, S. M., DiTullio, G. R., Lee, P. A., Smith, W. O., Peloquin, J., Tozzi, S., Sun, J., Zhang, Y., Dunbar, R. B., Long, M. C., Sohst, B., Lohan, M., Hutchins, D. A. 2010; 57 (3): 368-383
  • Plants cause ecosystem nutrient depletion via the interruption of bird-derived spatial subsidies PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Young, H. S., McCauley, D. J., Dunbar, R. B., Dirzo, R. 2010; 107 (5): 2072-2077

    Abstract

    Plant introductions and subsequent community shifts are known to affect nutrient cycling, but most such studies have focused on nutrient enrichment effects. The nature of plant-driven nutrient depletions and the mechanisms by which these might occur are relatively poorly understood. In this study we demonstrate that the proliferation of the commonly introduced coconut palm, Cocos nucifera, interrupts the flow of allochthonous marine subsidies to terrestrial ecosystems via an indirect effect: impact on birds. Birds avoid nesting or roosting in C. nucifera, thus reducing the critical nutrient inputs they bring from the marine environment. These decreases in marine subsidies then lead to reductions in available soil nutrients, decreases in leaf nutrient quality, diminished leaf palatability, and reduced herbivory. This nutrient depletion pathway contrasts the more typical patterns of nutrient enrichment that follow plant species introductions. Research on the effects of spatial subsidy disruptions on ecosystems has not yet examined interruptions driven by changes within the recipient community, such as plant community shifts. The ubiquity of coconut palm introductions across the tropics and subtropics makes these observations particularly noteworthy. Equally important, the case of C. nucifera provides a strong demonstration of how plant community changes can dramatically impact the supply of allochthonous nutrients and thereby reshape energy flow in ecosystems.

    View details for DOI 10.1073/pnas.0914169107

    View details for Web of Science ID 000274296300049

    View details for PubMedID 20133852

  • Coconut palm causes ecosystem nutrient depletion via the interruption of bird derived spatial subsidies Proceedings National Academy of Sciences Young, H. S., McCauley, D. J., Dunbar, R. B., Dirzo, R. 2010

    View details for DOI 10.1073/pnas.0914169107

  • Interactive Effects of CO2, Irradiance and Iron on Ross Sea Phytoplankton Deep Sea Research, Part I Feng, Y., Hare, C. E., Rose, J. M., Handy, S. M., DiTullio, G. R., Lee, P. A., Smith, W. O. Jr., Peloquin, J., Tozzi, S., Sun, J., Zhang, Y., Dunbar, R. B., Long, M. C., Sohst, B., Hutchins, D. A. 2010; 57: 368-383
  • Niche partitioning among and within sympatric tropical seabirds revealed by stable isotope analysis MARINE ECOLOGY PROGRESS SERIES Young, H. S., McCauley, D. J., Dirzo, R., Dunbar, R. B., Shaffer, S. A. 2010; 416: 285-294

    View details for DOI 10.3354/meps08756

    View details for Web of Science ID 000283446400023

  • Upper ocean nitrogen fluxes in the Polar Antarctic Zone: Constraints from the nitrogen and oxygen isotopes of nitrate GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS DiFiore, P. J., Sigman, D. M., Dunbar, R. B. 2009; 10
  • Late 20th century warming and freshening in the central tropical Pacific GEOPHYSICAL RESEARCH LETTERS Nurhati, I. S., Cobb, K. M., Charles, C. D., Dunbar, R. B. 2009; 36
  • Extreme longevity in proteinaceous deep-sea corals PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA Roark, E. B., Guilderson, T. P., Dunbar, R. B., Fallon, S. J., Mucciarone, D. A. 2009; 106 (13): 5204-5208

    Abstract

    Deep-sea corals are found on hard substrates on seamounts and continental margins worldwide at depths of 300 to approximately 3,000 m. Deep-sea coral communities are hotspots of deep ocean biomass and biodiversity, providing critical habitat for fish and invertebrates. Newly applied radiocarbon age dates from the deep water proteinaceous corals Gerardia sp. and Leiopathes sp. show that radial growth rates are as low as 4 to 35 mum year(-1) and that individual colony longevities are on the order of thousands of years. The longest-lived Gerardia sp. and Leiopathes sp. specimens were 2,742 years and 4,265 years, respectively. The management and conservation of deep-sea coral communities is challenged by their commercial harvest for the jewelry trade and damage caused by deep-water fishing practices. In light of their unusual longevity, a better understanding of deep-sea coral ecology and their interrelationships with associated benthic communities is needed to inform coherent international conservation strategies for these important deep-sea habitat-forming species.

    View details for DOI 10.1073/pnas.0810875106

    View details for Web of Science ID 000264790600046

    View details for PubMedID 19307564

  • Strontium-86 labeling experiments show spatially heterogeneous skeletal formation in the scleractinian coral Porites porites GEOPHYSICAL RESEARCH LETTERS Houlbreque, F., Meibom, A., Cuif, J., Stolarski, J., Marrocchi, Y., Ferrier-Pages, C., Domart-Coulon, I., Dunbar, R. B. 2009; 36
  • Synergistic effects of iron and temperature on Antarctic phytoplankton and microzooplankton assemblages BIOGEOSCIENCES Rose, J. M., Feng, Y., DiTullio, G. R., Dunbar, R. B., Hare, C. E., Lee, P. A., Lohan, M., Long, M., Smith, W. O., Sohst, B., Tozzi, S., Zhang, Y., Hutchins, D. A. 2009; 6 (12): 3131-3147
  • Recent advances in understanding Antarctic climate evolution ANTARCTIC SCIENCE Siegert, M. J., Barrett, P., Decont, R., Dunbar, R., Cofaigh, C. O., Passchier, S., Naish, T. 2008; 20 (4): 313-325
  • Isotopic evidence for hydrologic change related to the westerlies in SW Patagonia, Chile, during the last millennium QUATERNARY SCIENCE REVIEWS Moy, C. M., Dunbar, R. B., Moreno, P. I., Francois, J., Villa-Martinez, R., Mucciarone, D. M., Guilderson, T. P., Garreaud, R. D. 2008; 27 (13-14): 1335-1349
  • Persistence of depleted abalones in marine reserves of central California BIOLOGICAL CONSERVATION Micheli, F., Shelton, A. O., Bushinsky, S. M., Chiu, A. L., Haupt, A. J., Heiman, K. W., Kappel, C. V., Lynch, M. C., Martone, R. G., Dunbar, R. B., Watanabe, J. 2008; 141 (4): 1078-1090
  • Compositional variations at ultra-structure length scales in coral skeleton GEOCHIMICA ET COSMOCHIMICA ACTA Meibom, A., Cuif, J., Houlbreque, F., Mostefaoui, S., Dauphin, Y., Meibom, K. L., Dunbar, R. 2008; 72 (6): 1555-1569
  • Seismic stratigraphy of Lago Fagnano sediments (Tierra del Fuego, Argentina) - A potential archive of paleoclimatic change and tectonic activity since the Late Glacial GEOLOGICA ACTA Waldmann, N., Ariztegui, D., Anselmetti, F. S., Austin, J. A., Dunbar, R., Moy, C. M., Recasens, C. 2008; 6 (1): 101-110
  • CO2 sensitivity of Southern Ocean phytoplankton GEOPHYSICAL RESEARCH LETTERS Tortell, P. D., Payne, C. D., Li, Y., Trimborn, S., Rost, B., Smith, W. O., Riesselman, C., Dunbar, R. B., Sedwick, P., DiTullio, G. R. 2008; 35 (4)
  • Antarctic records of precession-paced insolation-driven warming during early Pleistocene Marine Isotope Stage 31 GEOPHYSICAL RESEARCH LETTERS Scherer, R. P., Bohaty, S. M., Dunbar, R. B., Esper, O., Flores, J., Gersonde, R., Harwood, D. M., Roberts, A. P., Taviani, M. 2008; 35 (3)
  • Multidecadal- to century-scale and episodes on the northern Altiplano during the middle Holocene PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY Theissen, K. M., Dunbar, R. B., Rowe, H. D., Mucciarone, D. A. 2008; 257 (4): 361-376
  • Multi-decadal to century scale arid episodes on the northern Altiplano during the middle Holocene Palaeogeography, Palaeoclimatology, Palaeoecology Theissen, K., Dunbar, R. B., Rowe, H. R., Mucciarone, D. A. 2008; 257: 361–376
  • Response of southern ocean phytoplankton to CO2 Geophysical Research Letters Tortell, P. D., Payne, C. D., Li, Y., S. Trimborn, B. Rost, Smith, W. O., Riesselman, C., Dunbar, R. B., Sedwick, P., DiTullio, G. R. 2008; 35

    View details for DOI 10.1029/2007GL032583

  • Sedimentary sterols as biogeochemical indicators in the Southern Ocean Organic Geochemistry Villinski, J. C., Hayes, J. M., Brassell, S., Riggert, V., Dunbar, R. B. 2008; 39: 569-588
  • Chemical variations at ultra-structure length-scales in coral skeleton: Towards an understanding of 'vital' effects Geochimica et Cosmochimica Acta Meibom, A., Cuif, J.-P., Mostefaoui, S., Dauphin, Y., Houlbreque, F., Meibom, K., Dunbar, R. 2008
  • Seasonal rhythms of net primary production and particulate organic carbon flux to depth describe the efficiency of biological pump in the global ocean JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Lutz, M. J., Caldeira, K., Dunbar, R. B., Behrenfeld, M. J. 2007; 112 (C10)
  • Oceanic climate and circulation changes during the past four centuries from radiocarbon in corals GEOPHYSICAL RESEARCH LETTERS Druffel, E. R., Griffin, S., Beaupre, S. R., Dunbar, R. B. 2007; 34 (9)
  • High apex predator biomass on remote Pacific islands CORAL REEFS Stevenson, C., Katz, L. S., Micheli, F., Block, B., Heiman, K. W., Perle, C., Weng, K., Dunbar, R., Witting, J. 2007; 26 (1): 47-51
  • East African soil erosion recorded in a 300 year old coral colony from Kenya GEOPHYSICAL RESEARCH LETTERS Fleitmann, D., Dunbar, R. B., McCulloch, M., Mudelsee, M., Vuille, M., McClanahan, T. R., Cole, J. E., Eggins, S. 2007; 34 (4)
  • Reconstruction of seasonal temperature variability in the tropical Pacific Ocean from the shell of the scallop, Comptopallium radula GEOCHIMICA ET COSMOCHIMICA ACTA Thebault, J., Chauvaud, L., Clavier, J., Guarini, J., Dunbar, R. B., Fichez, R., Mucciarone, D. A., Morize, E. 2007; 71 (4): 918-928
  • Biological forcing controls the chemistry of reef-building coral skeleton GEOPHYSICAL RESEARCH LETTERS Meibom, A., Mostefaoui, S., Cuif, J., Dauphin, Y., Houlbreque, F., Dunbar, R., Constantz, B. 2007; 34 (2)
  • Recent Advances in understanding Antarctic Climate Evolution (not peer-reviewed) PAGES Newsletter Siegert, M. J., Barrett, P. J., DeConto, R., Dunbar, R. B., Cofaigh, O., Passchier, S., Naish, T. R. 2007; 15: 9-11
  • Lago Fagnano (Tierra del Fuego, Argentina) - A continuous archive of paleoclimatic change and tectonic activity since the Late Glacial Geologica Acta Waldmann, N., Ariztegui, D., Anselmetti, F. S., Jr., Austin, J. A., Dunbar, R., M. Moy, C. M., Recasens, C. 2007; 5: 1-10
  • The history of soil erosion in Kenya recorded in a 300 year-long coral Geophysical Research Letters Fleitmann, D., Dunbar, R. B., McCulloch, M., Mudelsee, M., Vuille, M., McClanahan, T., Cole, J., Andrews, C., Mucciarone, D. A. 2007

    View details for DOI 10.1029/2006GL028525

  • Post-glacial seasonal diatom record of the Mertz Glacier Polynya, East Antarctica MARINE MICROPALEONTOLOGY Maddison, E. J., Pike, J., Leventer, A., Dunbar, R., Brachfeld, S., Domack, E. W., Manley, P., McClennen, C. 2006; 60 (1): 66-88
  • Vital effects in coral skeletal composition display strict three-dimensional control GEOPHYSICAL RESEARCH LETTERS Meibom, A., Yurimoto, H., Cuif, J., Domart-Coulon, I., Houlbreque, F., Constantz, B., Dauphin, Y., Tambutte, E., Tambutte, S., Allemand, D., Wooden, J., Dunbar, R. 2006; 33 (11)
  • Radiocarbon-based ages and growth rates of Hawaiian deep-sea corals MARINE ECOLOGY PROGRESS SERIES Roark, E. B., Guilderson, T. P., Dunbar, R. B., Ingram, B. L. 2006; 327: 1-14
  • Sediment colour analysis from digital images and correlation with sediment composition Geological Society, London, Special Publications Nederbragt, A. J., Dunbar, R. B., Osborn, A. T., Palmer , A., Thurow, J. W., Wagner, T. 2006; 267: 113-128
  • East Antarctic Margin Marine Sediment Record of Deglaciation GSA Today Leventer, A., Domack, E., Dunbar, R., Pike, J., Stickley, C., Maddison, E., Brachfeld, S., Manley, P., McClennen, C. 2006; 16: 4-10

    View details for DOI 10.1130/GSAT01612A.1

  • Deglacial ocean and climate seasonality in laminated diatom sediments, Mac.Robertson Shelf, Antarctica PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY Stickley, C. E., Pike, J., Leventer, A., Dunbar, R., Domack, E. W., Brachfeld, S., Manley, P., McClennan, C. 2005; 227 (4): 290-310
  • Coral skeletal delta N-15 reveals isotopic traces of an agricultural revolution MARINE POLLUTION BULLETIN Marion, G. S., Dunbar, R. B., Mucciarone, D. A., Kremer, J. N., Lansing, J. S., Arthawiguna, A. 2005; 50 (9): 931-944

    Abstract

    This study introduces a new method of tracing the history of nutrient loading in coastal oceans via delta(15)N analysis of organic nitrogen preserved in the skeleton of the massive Porites coral. Four coral cores were collected in Bali, Indonesia, from reefs exposed to high levels of fertilizers in agricultural run-off, from lagoonal corals impacted by sewage, and from a reef located 30 km offshore. Skeletal delta(15)N in the agriculturally exposed coral declined from 10.7+/-0.4 per thousand in 1970-1971, when synthetic fertilizers (-0.8 per thousand+/-0.2 per thousand) were introduced to Bali, to a depleted "anthropogenic" baseline of 3.5 per thousand+/-0.4% in the mid-1990s. delta(15)N values were negatively correlated with rainfall, suggesting that marine delta(15)N lowers during flood-bourn influxes of waste fertilizers. Reef cores exposed to untreated sewage in terrestrial discharge were enriched (7.8 and 7.3+/-0.4 per thousand), while the offshore core reflected background oceanic signals (6.2+/-0.4 per thousand). delta(15)N, N concentration, and C:N systematics indicate that the N isotopic composition of skeletal organic matter was generally well preserved over 30 years. We suggest that skeletal organic delta(15)N can serve as a recorder of past nitrogen sources. In Bali, this tracer suggests that the intensification of Western style agricultural practices since 1970 are contributing to the degradation of coastal coral reefs.

    View details for DOI 10.1016/j.marpolbul.2005.04.001

    View details for Web of Science ID 000232347600014

    View details for PubMedID 16054162

  • Shell of the Great Scallop Pecten maximus as a high-frequency archive of paleoenvironmental changes GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS Chauvaud, L., Lorrain, A., Dunbar, R. B., Paulet, Y. M., Thouzeau, G., Jean, F., Guarini, J. M., Mucciarone, D. 2005; 6
  • A comparative analysis of the nutritional and elemental composition of macroalgae from the western Antarctic Peninsula PHYCOLOGIA Peters, K. J., Amsler, C. D., Amsler, M. O., McClintock, J. B., Dunbar, R. B., Baker, B. J. 2005; 44 (4): 453-463
  • Record of redox status in laminated sediments from Lake Titicaca: A sulfur K-edge X-ray absorption near edge structure (XANES) study CHEMICAL GEOLOGY Bostick, B. C., Theissen, K. M., Dunbar, R. B., Vairavamurthy, M. A. 2005; 219 (1-4): 163-174
  • Intrabasin comparison of surface radiocarbon levels in the Indian Ocean between coral records and three-dimensional global ocean models GLOBAL BIOGEOCHEMICAL CYCLES Grumet, N. S., Duffy, P. B., Wickett, M. E., Caldeira, K., Dunbar, R. B. 2005; 19 (2)
  • Radiocarbon-based ages and growth rates of bamboo corals from the Gulf of Alaska GEOPHYSICAL RESEARCH LETTERS Roark, E. B., Guilderson, T. P., Flood-Page, S., Dunbar, R. B., Ingram, B. L., Fallon, S. J., McCulloch, M. 2005; 32 (4)
  • Pronounced occurrence of long-chain alkenones and dinosterol in a 25,000-year lipid molecular fossil record from Lake Titicaca, South America GEOCHIMICA ET COSMOCHIMICA ACTA Theissen, K. M., Zinniker, D. A., Moldowan, J. M., Dunbar, R. B., Rowe, H. D. 2005; 69 (3): 623-636
  • Record of Redox Status in Sediment Laminations from Lake Titicaca: A Sulfur K-edge X-ray Absorption Near Edge Structure (XANES) Study Chemical Geology Bostick, B. C., Theissen, K. T., Dunbar, R., Fendorf, S., Vairavamurthy, M. A. 2005; 219: 163-174
  • Distribution of magnesium in coral skeleton GEOPHYSICAL RESEARCH LETTERS Meibom, A., Cuif, J. P., Hillion, F. O., Constantz, B. R., Juillet-Leclerc, A., Dauphin, Y., Watanabe, T., Dunbar, R. B. 2004; 31 (23)
  • delta C-13 variation in scallop shells: Increasing metabolic carbon contribution with body size? GEOCHIMICA ET COSMOCHIMICA ACTA Lorrain, A., Paulet, Y. M., Chauvaud, L., Dunbar, R., Mucciarone, D., Fontugne, M. 2004; 68 (17): 3509-3519
  • Hydrologic-energy balance constraints on the Holocene lake-level history of lake Titicaca, South America CLIMATE DYNAMICS Rowe, H. D., Dunbar, R. B. 2004; 23 (3-4): 439-454
  • Coral radiocarbon records of Indian Ocean water mass mixing and wind-induced upwelling along the coast of Sumatra, Indonesia JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Grumet, N. S., Abram, N. J., Beck, J. W., Dunbar, R. B., Gagan, M. K., Guilderson, T. P., Hantoro, W. S., Suwargadi, B. W. 2004; 109 (C5)
  • Seismic stratigraphic correlations between ODP Sites 742 and 1166: implications for depositional paleoenvironments in Prydz Bay, Antarctica Proc. ODP, Sci. Results Erohina, T., Cooper, A., Handwerger, D., Dunbar, R., Cooper (ed.), A. K., O'Brien (ed.), P. E., Richter (ed.), C. 2004; 188: 21pp
  • Synthetic seismograms linking ODP sites to seismic profiles, continental rise and shelf of Prydz Bay, Antarctica Proc. ODP, Sci. Results Handwerger, D. A., Cooper, A. K., O'Brien, P. E., Williams, T., Barr, S. R., Dunbar, R. B., Leventer, A., Jarrard, R. D., Cooper (ed.), A. K., O'Brien (ed.), P. E., Richter (ed.) , C. 2004; 188
  • The Pleistocene evolution of the East Antarctic Ice Sheet in the Prydz bay region: stable isotopic evidence from ODP site 1167 GLOBAL AND PLANETARY CHANGE Theissen, K. M., Dunbar, R. B., Cooper, A. K., Mucciarone, D. A., Hoffmann, D. 2003; 39 (3-4): 227-256
  • Physical control of chlorophyll a, POC, and TPN distributions in the pack ice of the Ross Sea, Antarctica JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Arrigo, K. R., ROBINSON, D. H., Dunbar, R. B., Leventer, A. R., Lizotte, M. P. 2003; 108 (C10)
  • Late Quaternary lake-level changes constrained by radiocarbon and stable isotope studies on sediment cores from Lake Titicaca, South America GLOBAL AND PLANETARY CHANGE Rowe, H. D., Guilderson, T. P., Dunbar, R. B., Southon, J. R., Seltzer, G. O., Mucciarone, D. A., Fritz, S. C., Baker, P. A. 2003; 38 (3-4): 273-290
  • Monthly Strontium/Calcium oscillations in symbiotic coral aragonite: Biological effects limiting the precision of the paleotemperature proxy GEOPHYSICAL RESEARCH LETTERS Meibom, A., Stage, M., Wooden, J., Constantz, B. R., Dunbar, R. B., Owen, A., Grumet, N., Bacon, C. R., CHAMBERLAIN, C. P. 2003; 30 (7)
  • Sediment trap records of glacimarine sedimentation at Muller Ice Shelf, Lallemand Fjord, Antarctic Peninsula ARCTIC ANTARCTIC AND ALPINE RESEARCH Gilbert, R., Chong, A., Dunbar, R. B., Domack, E. W. 2003; 35 (1): 24-33
  • Global change - Leads, lags and the tropics NATURE Dunbar, R. B. 2003; 421 (6919): 121-122

    View details for DOI 10.1038/421121a

    View details for Web of Science ID 000180267200023

    View details for PubMedID 12520285

  • Decadal timescale shift in the C-14 record of a central equatorial Pacific coral RADIOCARBON Grottoli, A. G., Gille, S. T., DRUFFEL, E. R., Dunbar, R. B. 2003; 45 (1): 91-99
  • Stable isotopic measurements of sedimentary organic matter and N. pachyderma (s.) from Site 1166, Prydz Bay continental shelf Proc. ODP, Sci. Results Theissen, K. M., Dunbar, R. B., Cooper, A. K., Cooper (ed.), A. K., O'Brien (ed.), P. E., Richter (ed.), C. 2003; 188: 1-11
  • Antarctic Climate Evolution (ACE) Research Initiative Terra Antarctica Florindo, F., Dunbar, R., Siegert, M., DeConto, R., Barrett, P., Cooper, A., Escutia, C., Janecek, T., Larter, R., Naish, T., Powell, R. 2003; 9: 127-132
  • Global Change: Leads, lags, and the tropics Nature Dunbar, R. B. 2003; 421: 121-122

    View details for DOI 10.1038/421121a

  • Sediment trap records of glaciomarine sedimentation at Miller Ice Shelf, Lallemand Fjord, Antarctic Peninsula, Arctic Antarctic and Alpine Research Gilbert, R., Chong, A., Dunbar, R. B., Domack, E. W. 2003; 35: 24-33
  • Early deglaciation in the tropical Andes - Response SCIENCE Seltzer, G. O., Rodbell, D. T., Baker, P. A., Fritz, S. C., Tapia, P. M., Rowe, H. D., Dunbar, R. B. 2002; 298 (5591)
  • Taxon-specific differences in C/P and N/P drawdown for phytoplankton in the Ross Sea, Antarctica GEOPHYSICAL RESEARCH LETTERS Arrigo, K. R., Dunbar, R. B., Lizotte, M. P., ROBINSON, D. H. 2002; 29 (19)
  • Meridional transport in the Indian Ocean traced by coral radiocarbon JOURNAL OF MARINE RESEARCH Grumet, N. S., Guilderson, T. P., Dunbar, R. B. 2002; 60 (5): 725-742
  • Regional variability in the vertical flux of particulate organic carbon in the ocean interior GLOBAL BIOGEOCHEMICAL CYCLES Lutz, M., Dunbar, R., Caldeira, K. 2002; 16 (3)
  • Early warming of tropical South America at the Last Glacial-interglacial transition SCIENCE Seltzer, G. O., Rodbell, D. T., Baker, P. A., Fritz, S. C., Tapia, P. M., Rowe, H. D., Dunbar, R. B. 2002; 296 (5573): 1685-1686

    Abstract

    Glaciation in the humid tropical Andes is a sensitive indicator of mean annual temperature. Here, we present sedimentological data from lakes beyond the glacial limit in the tropical Andes indicating that deglaciation from the Last Glacial Maximum led substantial warming at high northern latitudes. Deglaciation from glacial maximum positions at Lake Titicaca, Peru/Bolivia (16 degrees S), and Lake Junin, Peru (11 degrees S), occurred 22,000 to 19,500 calendar years before the present, several thousand years before the Bølling-Allerød warming of the Northern Hemisphere and deglaciation of the Sierra Nevada, United States (36.5 degrees to 38 degrees N). The tropical Andes deglaciated while climatic conditions remained regionally wet, which reflects the dominant control of mean annual temperature on tropical glaciation.

    View details for Web of Science ID 000175976200057

    View details for PubMedID 12040193

  • Particulate barium fluxes in the Ross Sea MARINE GEOLOGY McManus, J., Dymond, J., Dunbar, R. B., Collier, R. W. 2002; 184 (1-2): 1-15
  • Late-Quaternary lowstands of Lake Titicaca: evidence from high-resolution seismic data PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY D'Agostino, K., Seltzer, G., Baker, P., Fritz, S., Dunbar, R. 2002; 179 (1-2): 97-111
  • Pre-bomb radiocarbon variability inferred from a Kenyan coral record RADIOCARBON Grumet, N. S., Guilderson, T. P., Dunbar, R. B. 2002; 44 (2): 581-590
  • Coral radiocarbon as a tracer for meridional transport in the Indian Ocean Journal of Marine Research Grumet, N. S., Guilderson, T. P., Dunbar, R. B. 2002; 60: 725-742
  • Late Quaternary seismic stratigraphy of Lake Titicaca (Peru/Bolivia) Palaeogeography, Palaeoclimatology, Palaeoecology D'Agostino, K., Seltzer, G. O., Baker, P. A., Fritz, S. C., Dunbar, R. B. 2002; 179: 97-111
  • Insolation, moisture balance and climate change on the South American Altiplano since the last glacial maximum CLIMATIC CHANGE Rowe, H. D., Dunbar, R. B., Mucciarone, D. A., Seltzer, G. O., Baker, P. A., Fritz, S. 2002; 52 (1-2): 175-199
  • Late quaternary climate and hydrology of tropical South America inferred from an isotopic and chemical model of Lake Titicaca, Bolivia and Peru QUATERNARY RESEARCH Cross, S. L., Baker, P. A., Seltzer, G. O., Fritz, S. C., Dunbar, R. B. 2001; 56 (1): 1-9
  • The history of South American tropical precipitation for the past 25,000 years SCIENCE Baker, P. A., Seltzer, G. O., Fritz, S. C., Dunbar, R. B., Grove, M. J., Tapia, P. M., Cross, S. L., Rowe, H. D., Broda, J. P. 2001; 291 (5504): 640-643

    Abstract

    Long sediment cores recovered from the deep portions of Lake Titicaca are used to reconstruct the precipitation history of tropical South America for the past 25,000 years. Lake Titicaca was a deep, fresh, and continuously overflowing lake during the last glacial stage, from before 25,000 to 15,000 calibrated years before the present (cal yr B.P.), signifying that during the last glacial maximum (LGM), the Altiplano of Bolivia and Peru and much of the Amazon basin were wetter than today. The LGM in this part of the Andes is dated at 21,000 cal yr B.P., approximately coincident with the global LGM. Maximum aridity and lowest lake level occurred in the early and middle Holocene (8000 to 5500 cal yr B.P.) during a time of low summer insolation. Today, rising levels of Lake Titicaca and wet conditions in Amazonia are correlated with anomalously cold sea-surface temperatures in the northern equatorial Atlantic. Likewise, during the deglacial and Holocene periods, there were several millennial-scale wet phases on the Altiplano and in Amazonia that coincided with anomalously cold periods in the equatorial and high-latitude North Atlantic, such as the Younger Dryas.

    View details for Web of Science ID 000166616000040

    View details for PubMedID 11158674

  • Chronology of the Palmer Deep site, Antarctic Peninsula: a Holocene palaeoenvironmental reference for the circum-Antarctic HOLOCENE Domack, E., Leventer, A., Dunbar, R., Taylor, F., Brachfeld, S., Sjunneskog, C. 2001; 11 (1): 1-9
  • ODP Leg 178 Scientific Party, 2001, Holocene Climate Variability in the Antarctic Peninsula The Holocene Domack, E., Leventer, A., Dunbar, R., Taylor, F., Brachfeld, S. 2001; 11: 1-9
  • El Nino - Clues from corals NATURE Dunbar, R. B. 2000; 407 (6807): 956-959

    View details for Web of Science ID 000090032500028

    View details for PubMedID 11069165

  • Carbon 13 Carbon 12 ratios of sedimentary organic matter from the Ross Sea, Antarctica: A record of phytoplankton bloom dynamics JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Villinski, J. C., Dunbar, R. B., Mucciarone, D. A. 2000; 105 (C6): 14163-14172
  • El Nino Southern Oscillation (ENSO) and decadal-scale climate variability at 10 degrees N in the eastern Pacific from 1893 to 1994: A coral-based reconstruction from Clipperton Atoll PALEOCEANOGRAPHY Linsley, R. K., Ren, L., Dunbar, R. B., Howe, S. S. 2000; 15 (3): 322-335
  • Phytoplankton taxonomic variability in nutrient utilization and primary production in the Ross Sea JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Arrigo, K. R., DiTullio, G. R., Dunbar, R. B., Robinson, D. H., VanWoert, M., Worthen, D. L., Lizotte, M. P. 2000; 105 (C4): 8827-8845
  • Rapid and early export of Phaeocystis antarctica blooms in the Ross Sea, Antarctica NATURE DiTullio, G. R., Grebmeier, J. M., Arrigo, K. R., Lizotte, M. P., ROBINSON, D. H., Leventer, A., Barry, J. B., VanWoert, M. L., Dunbar, R. B. 2000; 404 (6778): 595-598

    Abstract

    The Southern Ocean is very important for the potential sequestration of carbon dioxide in the oceans and is expected to be vulnerable to changes in carbon export forced by anthropogenic climate warming. Annual phytoplankton blooms in seasonal ice zones are highly productive and are thought to contribute significantly to pCO2 drawdown in the Southern Ocean. Diatoms are assumed to be the most important phytoplankton class with respect to export production in the Southern Ocean; however, the colonial prymnesiophyte Phaeocystis antarctica regularly forms huge blooms in seasonal ice zones and coastal Antarctic waters. There is little evidence regarding the fate of carbon produced by P. antarctica in the Southern Ocean, although remineralization in the upper water column has been proposed to be the main pathway in polar waters. Here we present evidence for early and rapid carbon export from P. antarctica blooms to deep water and sediments in the Ross Sea. Carbon sequestration from P. antarctica blooms may influence the carbon cycle in the Southern Ocean, especially if projected climatic changes lead to an alteration in the structure of the phytoplankton community.

    View details for Web of Science ID 000086400100051

    View details for PubMedID 10766240

  • Tropical Pacific forcing of decadal SST variability in the western Indian Ocean over the past two centuries SCIENCE Cole, J. E., Dunbar, R. B., McClanahan, T. R., Muthiga, N. A. 2000; 287 (5453): 617-619
  • New views of tropical paleoclimate from Corals Quaternary Science Reviews Gagan, M.K., Ayliffe, L.K., Beck, J.W., Cole, J.E., Druffel, E.R.M., Dunbar, R.B., Schrag, D.P. 2000; 19: 167-182
  • ENSO and decadal-scale climate variability at 10 Deg N in the eastern Pacific from 1893 to 1994: A coral-based reconstruction from Clipperton Atoll Paleoceanography Linsley, B. K., Ren, L., Dunbar, R. B., Howe, S. H. 2000; 15: 322-335
  • A new estimate of the Holocene lowstand level of Lake Titicaca, central Andes, and implications for tropical palaeohydrology HOLOCENE Cross, S. L., Baker, P. A., Seltzer, G. O., Fritz, S. C., Dunbar, R. B. 2000; 10 (1): 21-32
  • The vertical flux of biogenic and lithogenic material in the Ross Sea: Moored sediment trap observations 1996-1998 DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY Collier, R., Dymond, J., Honjo, S., Manganini, S., Francois, R., Dunbar, R. 2000; 47 (15-16): 3491-3520
  • Assessing between-colony oxygen isotope variability in the coral Porites lobata at Clipperton Atoll CORAL REEFS Linsley, B. K., Messier, R. G., Dunbar, R. B. 1999; 18 (1): 13-27
  • Phytoplankton community structure and the drawdown of nutrients and CO2 in the Southern Ocean SCIENCE Arrigo, K. R., ROBINSON, D. H., Worthen, D. L., Dunbar, R. B., DiTullio, G. R., VanWoert, M., Lizotte, M. P. 1999; 283 (5400): 365-367
  • Annual Records of Tropical Systems PAGES Workshop Report Series Dunbar, R.B. and , R. B., Cole, J.E., J. E. 1999; 99 (1)
  • Water column sediment fluxes in the Ross Sea, Antarctica: Atmospheric and sea ice forcing JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Dunbar, R. B., Leventer, A. R., Mucciarone, D. A. 1998; 103 (C13): 30741-30759
  • Experimental dendroclimatic reconstruction of the Southern Oscillation BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY Stahle, D. W., D'Arrigo, R. D., Krusic, P. J., Cleaveland, M. K., Cook, E. R., Allan, R. J., Cole, J. E., Dunbar, R. B., Therrell, M. D., Gay, D. A., Moore, M. D., Stokes, M. A., Burns, B. T., Villanueva-Diaz, J., Thompson, L. G. 1998; 79 (10): 2137-2152
  • High-resolution seismic reflection profiles from Lake Titicaca, Peru-Bolivia: Evidence for Holocene aridity in the tropical Andes GEOLOGY Seltzer, G. O., Baker, P., Cross, S., Dunbar, R., Fritz, S. 1998; 26 (2): 167-170
  • The relationship between new production and vertical flux on the Ross Sea Continental Shelf Journal of Marine Systems Smith, W. O. Jr., Dunbar, R. B. 1998; 17: 445-457
  • Factors influencing the distribution of diatoms and other algae in the Ross Sea JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Leventer, A., Dunbar, R. B. 1996; 101 (C8): 18489-18500
  • Lateral transport of settling particles in the Ross Sea and implications for the fate of biogenic material JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Jaeger, J. M., Nittrouer, C. A., DeMaster, D. J., Kelchner, C., Dunbar, R. B. 1996; 101 (C8): 18479-18488
  • Cycling of organic carbon and biogenic silica in the Southern Ocean: Estimates of water-column and sedimentary fluxes on the Ross Sea continental shelf JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Nelson, D. M., DeMaster, D. J., Dunbar, R. B., Smith, W. O. 1996; 101 (C8): 18519-18532
  • Calibration of stable oxygen isotope signatures in Galapagos corals PALEOCEANOGRAPHY Wellington, G. M., Dunbar, R. B., Merlen, G. 1996; 11 (4): 467-480
  • ENVIRONMENTAL CONTROLS ON URANIUM IN REEF CORALS GEOCHIMICA ET COSMOCHIMICA ACTA Shen, G. T., Dunbar, R. B. 1995; 59 (10): 2009-2024
  • STABLE ISOTOPIC SIGNATURE OF EL-NINO SOUTHERN OSCILLATION EVENTS IN EASTERN TROPICAL PACIFIC REEF CORALS CORAL REEFS Wellington, G. M., Dunbar, R. B. 1995; 14 (1): 5-25
  • A CORAL-BASED RECONSTRUCTION OF INTERTROPICAL CONVERGENCE ZONE VARIABILITY OVER CENTRAL-AMERICA SINCE 1707 JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS Linsley, B. K., Dunbar, R. B., Wellington, G. M., Mucciarone, D. A. 1994; 99 (C5): 9977-9994
  • EASTERN PACIFIC SEA-SURFACE TEMPERATURE SINCE 1600-AD - THE DELTA-O-18 RECORD OF CLIMATE VARIABILITY IN GALAPAGOS CORALS PALEOCEANOGRAPHY Dunbar, R. B., Wellington, G. M., COLGAN, M. W., Glynn, P. W. 1994; 9 (2): 291-315
  • THE LATE PLEISTOCENE HISTORY OF SURFACE-WATER DELTA-C-13 IN THE SULU SEA - POSSIBLE RELATIONSHIP TO PACIFIC DEEP-WATER DELTA-C-13 CHANGES PALEOCEANOGRAPHY Linsley, B. K., Dunbar, R. B. 1994; 9 (2): 317-340
  • DIATOM EVIDENCE FOR LATE HOLOCENE CLIMATIC EVENTS IN GRANITE HARBOR, ANTARCTICA PALEOCEANOGRAPHY Leventer, A., Dunbar, R. B., DeMaster, D. J. 1993; 8 (3): 373-386
  • COLLECTION OF CO2 FOR C-13-C-12 MEASUREMENTS AND SIMULTANEOUS C, H, N, AND S ANALYSIS USING AN ELEMENTAL ANALYZER JOURNAL OF SEDIMENTARY PETROLOGY Mucciarone, D. A., Dunbar, R. B. 1992; 62 (4): 731-733
  • PALEOCHEMISTRY OF MANGANESE IN CORALS FROM THE GALAPAGOS-ISLANDS CORAL REEFS Shen, G. T., Campbell, T. M., Dunbar, R. B., Wellington, G. M., COLGAN, M. W., Glynn, P. W. 1991; 10 (2): 91-100
  • OCEAN DRILLING PROGRAM - EVOLUTION OF THE JAPAN SEA NATURE Anonymous 1990; 346 (6279): 18-20
  • CENOZOIC MARINE SEDIMENTATION IN THE SECHURA AND PISCO BASINS, PERU PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY Dunbar, R. B., MARTY, R. C., Baker, P. A. 1990; 77 (3-4): 235-261
  • ODP in the Japan Sea: Results of Leg 128 Geotimes Scientific Party, L. 1990: 25-27
  • BIOGENIC SEDIMENTATION IN MCMURDO SOUND, ANTARCTICA MARINE GEOLOGY Dunbar, R. B., Leventer, A. R., STOCKTON, W. L. 1989; 85 (2-4): 155-179
  • Reply to Comment on.... Late Eocene diatomite from the Peruvian coastal desert Geology Marty, R., Dunbar, R., Baker, P., Martin, J. 1989; 17: 958-959
  • LATE EOCENE DIATOMITE FROM THE PERUVIAN COASTAL DESERT, COASTAL UPWELLING IN THE EASTERN PACIFIC, AND PACIFIC CIRCULATION BEFORE THE TERMINAL EOCENE EVENT GEOLOGY Marty, R., Dunbar, R., Martin, J. B., Baker, P. 1988; 16 (9): 819-822
  • EL-NINO AND LITTLE ICE-AGE EFFECTS ON UPWELLING IN THE EASTERN TROPICAL PACIFIC CHEMICAL GEOLOGY Shen, C. T., Dunbar, R. B., COLGAN, M. W., Glynn, P. W. 1988; 70 (1-2): 198-198
  • RECENT DIATOM RECORD OF MCMURDO SOUND, ANTARCTICA: IMPLICATIONS FOR HISTORY OF SEA ICE EXTENT PALEOCEANOGRAPHY Leventer, A., Dunbar, R. B. 1988; 3 (3): 259-274
  • Recent diatom record of McMurdo Sound, Antarctica: implications for the history of sea ice extent Paleoceanography Leventer, A., Dunbar, R. 1988: 259-274
  • DIATOM FLUX IN MCMURDO SOUND, ANTARCTICA MARINE MICROPALEONTOLOGY Leventer, A., Dunbar, R. B. 1987; 12 (1): 49-64
  • The role of suspended sediment transport, sedimentation, and resuspension in controlling water quality in Lake Houston, Texas Environmental Geology Matty, J., Anderson, J., Dunbar, R. 1987; 10: 175-186
  • STABLE ISOTOPIC VARIATION IN PTEROPODS AND ATLANTIDS FROM NORTH PACIFIC SEDIMENT TRAPS MARINE MICROPALEONTOLOGY Grossman, E. L., Betzer, P. R., Dudley, W. C., Dunbar, R. B. 1986; 10 (1-3): 9-22
  • STABLE ISOTOPE FRACTIONATION IN BENTHIC FORAMINIFERA FROM THE PERUVIAN CONTINENTAL-MARGIN MARINE GEOLOGY Dunbar, R. B., Wefer, G. 1984; 59 (1-4): 215-225
  • A DEAD CENTRAL AMERICAN CORAL-REEF TRACT - POSSIBLE LINK WITH THE LITTLE ICE-AGE JOURNAL OF MARINE RESEARCH Glynn, P. W., DRUFFEL, E. M., Dunbar, R. B. 1983; 41 (3): 605-637
  • A SEDIMENT TRAP INTERCOMPARISON STUDY IN THE SANTA-BARBARA BASIN EARTH AND PLANETARY SCIENCE LETTERS Dymond, J., Fischer, K., Clauson, M., COBLER, R., Gardner, W., Richardson, M. J., Berger, W., Soutar, A., Dunbar, R. 1981; 53 (3): 409-418
  • STABLE ISOTOPES IN A BRANCHING CORAL MONITOR SEASONAL TEMPERATURE-VARIATION NATURE Dunbar, R. B., Wellington, G. M. 1981; 293 (5832): 453-455
  • A sediment trap intercomparison study in Santa Barbara Basin Earth and Planetary Science Letters Dymond, J., Fischer, K., Clauson, M., Cobbler, R., Gardner, W., Sullivan, L., Soutar, A., Berger, W., Dunbar, R. 1981; 53
  • Fecal pellet flux to modern bottom sediments of Santa Barbara Basin (California) based on sediment trapping Geological Society of America Bulletin Dunbar, R., Berger, W. 1981; 92

Books and Book Chapters


  • Stazioni di Ricerca in Antartide, 20.1, Il sito di ricerca Mooring A, Ross Sea, Antarctica La rete Italiana per la ricerca ecologica lungo termine (LTER-Italia) Ravaioli, M., Giglio, F., Langone, L., Capotondi, L., Bergami, C., Chiarini, F., Dunbar, R., Aliani, S., Paschini, E., Meloni, R., Focaccia, P. edited by Bertoni, R. ARACNE. 2012
  • Climate change in southern South America during the last two millennia Past climate variability from the Last Glacial Maximum to the Holocene in South America and Surrounding Regions Moy, C. M., Moreno, P. I., Dunbar, R. B., Francois, J. P., Kaplan, M. R., Villalba, R., Haberzettl,, T. edited by Vimeux, F., Sylvestre, F., Khodri, M. Springer. 2009 : 353-393
  • High resolution stable isotope and carbonate variability during the early Oligocene climate transition: Walvis Ridge (ODP Site 1263) USGS OF-2007-1047, Short Research Paper 095 Riesselman, C. R., Dunbar, R. B., Mucciarone, D. A., Kitasei, S. S. U.S. Geological Survey and The National Academies. 2007
  • Solar forcing and El Niño-Southern Oscillation (ENSO) influences on productivity cycles interpreted from a late-Holocene high-resolution marine sediment record, Adélie Drift, East Antarctic Margin USGS OF-2007-1047, Short Research Paper 036 Costa, E., Dunbar, R. B., Kryc, K. A., Mucciarone, D. A., Brachfeld, S., Roark, E. B., Manley, P. L., Murray, R. W., Leventer, A. U.S. Geological Survey and The National Academies. 2007
  • Non-Redfield production and export of marine organic matter: a recurrent part of the annual cycle in the Ross Sea, Antarctica Biogeochemistry of the Ross Sea Dunbar, R. B., Arrigo, K. R., DiTullio, G. D., Leventer, A., Lizotte, M. P., Van Woert, M. L., Robinson, D. H. edited by DiTullio, G., Dunbar, R. American Geophysical Union. 2003: 179-196
  • Stable isotope record of El Nino-Southern Oscillation events from Easter Island Easter Island: Scientific exploration into the world's environmental problems in microcosm Mucciarone, D. A., Dunbar, R. B. edited by Loret, J., Tanacredi, J. T. Kluwer Academic/Plenum Publishers, LTD. London/New York. 2003: 113-132
  • The Ross Sea circulation during the 1990s Biogeochemistry of the Ross Sea Van Woert, M. L., Johnson, E. S., Langone, L., Worthen, D. L., Monaghan, A., Bromwich, D. H., Meloni, R., Dunbar, R. B. edited by DiTullio, G., Dunbar, R. American Geophysical Union. 2003: 5-34

    View details for DOI 10.1029/078ars02

  • Rapid sinkimg of biogenic material during the late austral (Summer) in the Ross Sea, Antarctica Biogeochemistry of the Ross Sea Langone, L., Dunbar, R. B., Mucciarone, D. A., Ravaioli, M., Meloni, R., Nittrouer, C. A. edited by DiTullio, G., Dunbar, R. American Geophysical Union. 2003: 221-234

    View details for DOI 10.1029/078ars14

  • Biogeochemistry of the Ross Sea: A Summary Biogeochemistry of the Ross Sea DiTullio, G. D., Dunbar, R. B. edited by DiTullio, G., Dunbar, R. American Geophysical Union. 2003: 355-358

    View details for DOI 10.1029/078ars22

  • Oceanographic versus bathymetric control of benthic megafaunal communities in the SW Ross Sea, Antarctica Biogeochemistry of the Ross Sea Barry, J. P., Grebmeier, J. M., Smith, J., Dunbar, R. B. edited by DiTullio, G., Dunbar, R. American Geophysical Union. 2003: 327-354

    View details for DOI 10.1029/078ars21

  • Biogeochemistry of the Ross Sea: An Introduction Biogeochemistry of the Ross Sea DiTullio, G. D., Dunbar, R. B. edited by DiTullio, G. D., Dunbar, R. B. American Geophysical Union. 2003: 1-4

    View details for DOI 10.1029/078ars01

  • Biogeochemistry of the Ross Sea Antarctic Research Series Monograph edited by DiTullio, G. D., Dunbar, R. B. American Geophysical Union. 2003; 78

    View details for DOI 10.1029/ar078

  • Geologic and paleontologic features of rock samples in the cooperative Monterey organic geochemistry study, Naples Beach and Lions Head sections, California The Monterey Formation: From Rocks to Molecules Isaacs, C. M., Pollastro, R. M., Barron, J. A., Ingle, J. C., Bukry, D., Dunba, R. B., Keller, M. A., Tomson, J. H., Lewan, M. edited by Dsaacs, C. M., Rullkotte, J. Columbia University Press, New York. 2001: 373-392
  • The biological, chemical, and physical limnology of Lake Titicaca, Bolivia/Peru The Great Lakes of the World (GLOW): Food-web, Health, and Integrity Pawley, A., Fritz, S. C., Baker, P. A., Seltzer, G. O., Dunbar, R. B. edited by Munawar, M., Hecky, R. e. Backhuys Publishers, Leiden, Netherlands. 2001: 195-215
  • On the origin of carbonaceous matter, fullerenes, and elemental sulfur in rocks of the Whitewater Group, Susbury Impact Structure, Ontario, Canada Special Publications 339: Large Meteorite Impacts and Planetary Evolution II Heymann, D., Dressler, B. O., Buseck, P. R., Knell, J., Thiemens, M. H., Dunbar, R. B., Mucciarone, D., Sharpton, V. L. edited by Dressler, B. O. Geological Society of America . 2000: 345-360
  • Holocene climate variability: an update, 2000 The Way the Wind Blows: Climate, History, and Human Action Dunbar, R. B. edited by McIntosh, R. E., McIntosh, S. K., Tainter, J. E. Columbia University Press. 2000: 45-88
  • Diagenetic reactions in deeply buried sediments of the Japan Sea: a synthesis of interstitial water chemistry results from Leg 127 and Leg 128 Proceedings of the Ocean Drilling Program, Scientific Results, 127/128 Murray, R., Brumsack, H., von Breymann, M., Sturz, A., Dunbar, R., Gieskes, J. Ocean Drilling Program. 1992: 1261-1274
  • Late Pliocene-Quaternary biosiliceous sedimentation at site 798, Japan Sea Proceedings of the Ocean Drilling Program, Scientific Results, 127/128 Dunbar, R., deMenocal, P., Burckle, L. Ocean Drilling Program. 1992: 439-456
  • Eastern tropical Pacific corals monitor low latitude climate during the past 400 years Proceedings of the Seventh Annual Pacific Climate (PACLIM) Workshop, April 1990 Dunbar, R., Wellington, G., Colgan, M., Glynn, P. California Department of Water Resources. 1991: 183-198
  • Reef-building corals and identification of ENSO warming episodes Global ecological consequences of the 1982-83 El Nino-Southern Oscillation Druffel, E., Dunbar, R., Wellington, G., Minnis, S. Elsevier. 1990: 233-254
  • A cooperative study of upper ocean particulate fluxes in the Weddell Sea Proceedings of the Ocean Drilling Program, Initial Reports, 113 Biggs, D., Berkowitz, S., Altabet, M., Bidigare, R., DeMaster, D., Dunbar, R., Leventer, A., Macko, S., Nittrouer, C., Ondrusek, M. 1988: 77-86
  • Morphology of stacked marine delta lobes, East Pisco Basin, Peru. In: A. W. Bally (ed.) Atlas of Seismic Stratigraphy AAPG Studies in Geology Wright, R., Dunbar, R., Allen, M., Baker, P. 1988: 192-196
  • Phosphatic sediments of the Pisco Basin Cenozoic Geology of the Pisco Basin Allen, M., Dunbar, R. IGCP. 1988: 109-126
  • Geology of Quebrada Huaracangana Cenozoic Geology of the Pisco Basin Stock, C., Wright, R., Dunbar, R. IGCP. 1988: 79-98
  • Geologic setting, stratigraphy, and biogenic sediments of the Pisco Basin Cenozoic Geology of the Pisco Basin Dunbar, R., Baker, P., Marty, R., Cruzado, J. IGCP. 1988: 7-41
  • Role of sediment in the persistence and transport of enteric viruses in the estuarine environment Viruses in soils, sediments, and sludges Ellender, R., Anderson, J., Dunbar, R. CRC Press. 1987: 37-55
  • Oceanographic influences on sedimentation along the Antarctic continental shelf Oceanology of the Antarctic Shelf Dunbar, R., Anderson, J., Domack, E., Jacobs, S. American Geophysical Union. 1985: 291-312
  • Stable isotopes in foraminifera off Peru recording high fertility and change in upwelling history Coastal Upwelling: Its Sediment Record Wefer, G., Dunbar, R., Suess, E. Plenum Press. 1983: 295-310
  • Stable isotope record of upwelling and climate from Santa Barbara Basin, California Coastal Upwelling: Its Sediment Record Dunbar, R. Plenum Press. 1983: 217-246

Conference Proceedings


  • The Coral Proto - Free Ocean Carbon Enrichment System (CP-FOCE): Engineering and Development IEEE Engineering and Development, OCEANS' 10 Marker, M. D., Kline, I., Kirkwood, W. J., Headley, K., Brewer, P. G., Peltzer, E. T., Miard, T., Chai, A., James, M., Schneider, K., Silverman, J., Caldeira, K., Koseff, J. R., Monismith, S., Opdyke, B., Dunbar, R., White, R., Dove, S., Hoegh-Guldberg, O. 2010
  • Sedimentary sterols as biogeochemical indicators in the Southern Ocean Villinski, J. C., Hayes, J. M., Brassell, S. C., Riggert, V. L., Dunbar, R. B. PERGAMON-ELSEVIER SCIENCE LTD. 2008: 567-588
  • Glacial morphology and sediment formation in the Mertz Trough, East Antarctica McMullen, K., Domack, E., Leventer, A., Olson, C., Dunbar, R., Brachfeld, S. ELSEVIER SCIENCE BV. 2006: 169-180
  • Cenozoic ice sheet history from East Antarctic Wilkes Land continental margin sediments Escutia, C., De Santis, L., Donda, F., Dunbar, R. B., Cooper, A. K., Brancolini, G., Eittreim, S. L. ELSEVIER SCIENCE BV. 2005: 51-81
  • A Late Quaternary diatom record of tropical climatic history from Lake Titicaca (Peru and Bolivia) Tapia, P. M., Fritz, S. C., Baker, P. A., Seltzer, G. O., Dunbar, R. B. ELSEVIER SCIENCE BV. 2003: 139-164
  • Multisite Record of Climate Change from Indian Ocean Corals 9th International Coral Reef Symposium Grumet, N. S., Dunbar, R. B., Cole, J. E. 2002: 359-364
  • Paleoclimate reconstruction along the Pole-Equator-Pole transect of the Americas (PEP 1) Markgraf, V., Baumgartner, T. R., Bradbury, J. P., Diaz, H. F., Dunbar, R. B., Luckman, B. H., Seltzer, G. O., Swetnam, T. W., Villalba, R. PERGAMON-ELSEVIER SCIENCE LTD. 2000: 125-140
  • New views of tropical paleoclimates from corals Gagan, M. K., Ayliffe, L. K., Beck, J. W., Cole, J. E., DRUFFEL, E. R., Dunbar, R. B., Schrag, D. P. PERGAMON-ELSEVIER SCIENCE LTD. 2000: 45-64