Bio
I am an engineer and oceanographer who is interested in studying how physical processes shape coastal waters – combining principles of fluid mechanics, oceanography, and ecology. I use both field observations and numerical tools to examine circulation in the ocean, its natural variability, and influence on marine ecosystems and human-nature interactions. I joined Stanford department of Oceans in 2024. Before that, I was an Associate Professor in the Department of Civil & Environmental Engineering at the University of California, Irvine.
2024-25 Courses
- Introduction to Physical Oceanography
CEE 162D, CEE 262D, EARTHSYS 164, ESS 148 (Win) - Introduction to Physical Oceanography
OCEANS 162D, OCEANS 262D (Win) -
Independent Studies (1)
- Research
OCEANS 300 (Aut, Win, Spr, Sum)
- Research
Stanford Advisees
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Postdoctoral Faculty Sponsor
Griffin Srednick, Shuwen Tan -
Doctoral Dissertation Advisor (AC)
Madolyn Kelm -
Doctoral Dissertation Co-Advisor (AC)
Cameron Hallett
All Publications
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Seaweed blue carbon: Ready? Or Not?
MARINE POLICY
2023; 155
View details for DOI 10.1016/j.marpol.2023.105747
View details for Web of Science ID 001147738500001
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Large global variations in the carbon dioxide removal potential of seaweed farming due to biophysical constraints
COMMUNICATIONS EARTH & ENVIRONMENT
2023; 4 (1)
View details for DOI 10.1038/s43247-023-00833-2
View details for Web of Science ID 001008695900001
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Author Correction: Economic and biophysical limits to seaweed farming for climate change mitigation.
Nature plants
2023
View details for DOI 10.1038/s41477-023-01393-1
View details for PubMedID 36918722
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Economic and biophysical limits to seaweed farming for climate change mitigation.
Nature plants
2022
Abstract
Net-zero greenhouse gas (GHG) emissions targets are driving interest in opportunities for biomass-based negative emissions and bioenergy, including from marine sources such as seaweed. Yet the biophysical and economic limits to farming seaweed at scales relevant to the global carbon budget have not been assessed in detail. We use coupled seaweed growth and technoeconomic models to estimate the costs of global seaweed production and related climate benefits, systematically testing the relative importance of model parameters. Under our most optimistic assumptions, sinking farmed seaweed to the deep sea to sequester a gigaton of CO2 per year costs as little as US$480 per tCO2 on average, while using farmed seaweed for products that avoid a gigaton of CO2-equivalent GHG emissions annually could return a profit of $50 per tCO2-eq. However, these costs depend on low farming costs, high seaweed yields, and assumptions that almost all carbon in seaweed is removed from the atmosphere (that is, competition between phytoplankton and seaweed is negligible) and that seaweed products can displace products with substantial embodied non-CO2 GHG emissions. Moreover, the gigaton-scale climate benefits we model would require farming very large areas (>90,000km2)-a >30-fold increase in the area currently farmed. Our results therefore suggest that seaweed-based climate benefits may be feasible, but targeted research and demonstrations are needed to further reduce economic and biophysical uncertainties.
View details for DOI 10.1038/s41477-022-01305-9
View details for PubMedID 36564631
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On Internal Tides Driving Residual Currents and Upwelling on an Island
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
2022; 127 (7)
View details for DOI 10.1029/2021JC018261
View details for Web of Science ID 000819232200001
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Fate of Internal Waves on a Shallow Shelf
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
2020; 125 (5)
View details for DOI 10.1029/2019JC015377
View details for Web of Science ID 000548601000030
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Turbulence and Coral Reefs.
Annual review of marine science
2020
Abstract
The interaction of coral reefs, both chemically and physically, with the surrounding seawater is governed, at the smallest scales, by turbulence. Here, we review recent progress in understanding turbulence in the unique setting of coral reefs-how it influences flow and the exchange of mass and momentum both above and within the complex geometry of coral reef canopies. Flow above reefs diverges from canonical rough boundary layers due to their large and highly heterogeneous roughness and the influence of surface waves. Within coral canopies, turbulence is dominated by large coherent structures that transport momentum both into and away from the canopy, but it is also generated at smaller scales as flow is forced to move around branches or blades, creating wakes. Future work interpreting reef-related observations or numerical models should carefully consider the influence that spatial variation has on momentum and scalar flux. Expected final online publication date for the Annual Review of Marine Science, Volume 13 is January 3, 2021. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
View details for DOI 10.1146/annurev-marine-042120-071823
View details for PubMedID 32762591
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Temporal Variability in Thermally Driven Cross-Shore Exchange: The Role of Semidiurnal Tides
JOURNAL OF PHYSICAL OCEANOGRAPHY
2018; 48 (7): 1513–31
View details for DOI 10.1175/JPO-D-17-0257.1
View details for Web of Science ID 000437725400001
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High frequency temperature variability reduces the risk of coral bleaching (vol 9, 2018)
NATURE COMMUNICATIONS
2018; 9: 2244
Abstract
The original version of the Article was missing an acknowledgement of a funding source. The authors acknowledge that A. Safaie and K.Davis were supported by National Science Foundation Award No. 1436254 and G. Pawlak was supported by Award No. 1436522. This omission has now been corrected in the PDF and HTML versions of the Article.
View details for PubMedID 29872073
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High frequency temperature variability reduces the risk of coral bleaching
NATURE COMMUNICATIONS
2018; 9: 1671
Abstract
Coral bleaching is the detrimental expulsion of algal symbionts from their cnidarian hosts, and predominantly occurs when corals are exposed to thermal stress. The incidence and severity of bleaching is often spatially heterogeneous within reef-scales (<1 km), and is therefore not predictable using conventional remote sensing products. Here, we systematically assess the relationship between in situ measurements of 20 environmental variables, along with seven remotely sensed SST thermal stress metrics, and 81 observed bleaching events at coral reef locations spanning five major reef regions globally. We find that high-frequency temperature variability (i.e., daily temperature range) was the most influential factor in predicting bleaching prevalence and had a mitigating effect, such that a 1 °C increase in daily temperature range would reduce the odds of more severe bleaching by a factor of 33. Our findings suggest that reefs with greater high-frequency temperature variability may represent particularly important opportunities to conserve coral ecosystems against the major threat posed by warming ocean temperatures.
View details for PubMedID 29700296
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The Modification of Bottom Boundary Layer Turbulence and Mixing by Internal Waves Shoaling on a Barrier Reef
JOURNAL OF PHYSICAL OCEANOGRAPHY
2011; 41 (11): 2223-2241
View details for DOI 10.1175/2011JPO4344.1
View details for Web of Science ID 000298020600012
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Flow effects on benthic grazing on phytoplankton by a Caribbean reef
LIMNOLOGY AND OCEANOGRAPHY
2010; 55 (5): 1881-1892
View details for DOI 10.4319/lo.2010.55.5.1881
View details for Web of Science ID 000283667100007
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Effects of western boundary current dynamics on the internal wave field of the Southeast Florida shelf
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
2008; 113 (C9)
View details for DOI 10.1029/2007JC004699
View details for Web of Science ID 000259001900006
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Submarine groundwater discharge: An important source of new inorganic nitrogen to coral reef ecosystems
LIMNOLOGY AND OCEANOGRAPHY
2006; 51 (1): 343-348
View details for DOI 10.4319/lo.2006.51.1.0343
View details for Web of Science ID 000237399700035