Bio


I am a geophysicists who studies the near-surface hydrology of ice sheets and glaciers and the role that this system plays in their mass balance and stability in a warming world. My primary tool is airborne ice penetrating radar, and much of my work focuses on combining radar scattering models, field observations, and geophysical inverse methods to link physical conditions in the ice sheet to their expression in radar data. This approach lets me observe shallow water processes from the kilometer to ice-sheet scales over decades, illuminating the influence of climate on near-surface hydrology and the role of this system in modulating water and heat exchange between the glacier surface and bed. I also use some of these terrestrial observations as analogs to study near-surface cryo-hydrologic processes on icy satellites such as Europa.

Honors & Awards


  • Fellow, Stanford Diversifying Academia, Recruiting Excellence (DARE) Doctoral Fellowship (2021)
  • Mikio Takagi Student Prize, IEEE Geoscience and Remote Sensing Symposium Student Paper Competition (2020)
  • Best Student Poster, West Antarctic Ice Sheet Workshop (2019)
  • Best Student Oral Presentation, IGS Symposium on Five Decades of Radioglaciology (2019)
  • Fellow, National Defense Science and Engineering Graduate Fellowship (2019)
  • Steel Order of the De Fleury Medal, Army Engineer Association (2014)
  • Award for the Highest Composite Standing in Applied Science and Engineering, United States Military Academy (2012)
  • U. S. Grant Memorial Award for Excellence in Computer Science, United States Military Academy (2012)
  • Excellence in Geospatial Information Science Award, United States Military Academy (2012)

Professional Affiliations and Activities


  • Member, International Glaciological Society (2019 - Present)
  • Member, IEEE Geoscience and Remote Sensing Society (2018 - Present)
  • Member, American Geophysical Union (2018 - Present)

Education & Certifications


  • M.S., Stanford University, Electrical Engineering (2019)
  • B.S., United States Military Academy, Computer Science and Geospatial Information Science (2012)

Stanford Advisors


Lab Affiliations


Work Experience


  • Engineer Officer, United States Army (5/26/2012 - 9/1/2017)

    Location

    Joint Base Lewis-McChord, Washington, USA

  • Associate Research Analyst, Antennas and Radio Frequency Systems Division, Toyon Research Corporation (6/18/2018 - 9/15/2018)

    Location

    Santa Barbara, CA, USA

All Publications


  • Inferring Ice Fabric From Birefringence Loss in Airborne Radargrams: Application to the Eastern Shear Margin of Thwaites Glacier, West Antarctica JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE Young, T. J., Schroeder, D. M., Jordan, T. M., Christoffersen, P., Tulaczyk, S. M., Culberg, R., Bienert, N. L. 2021; 126 (5)
  • Extreme melt season ice layers reduce firn permeability across Greenland. Nature communications Culberg, R., Schroeder, D. M., Chu, W. 2021; 12 (1): 2336

    Abstract

    Surface meltwater runoff dominates present-day mass loss from the Greenland Ice Sheet. In Greenland's interior, porous firn can limit runoff by retaining meltwater unless perched low-permeability horizons, such as ice slabs, develop and restrict percolation. Recent observations suggest that such horizons might develop rapidly during extreme melt seasons. Here we present radar sounding evidence that an extensive near surface melt layer formed following the extreme melt season in 2012. This layer was still present in 2017 in regions up to 700m higher in elevation and 160km further inland than known ice slabs. We find that melt layer formation is driven by local, short-timescale thermal and hydrologic processes in addition to mean climate state. These melt layers reduce vertical percolation pathways, and, under appropriate firn temperature and surface melt conditions, encourage further ice aggregation at their horizon. Therefore, the frequency of extreme melt seasons relative to the rate at which pore space and cold content regenerates above the most recent melt layer may be a key determinant of the firn's multi-year response to surface melt.

    View details for DOI 10.1038/s41467-021-22656-5

    View details for PubMedID 33879796

  • Firn Clutter Constraints on the Design and Performance of Orbital Radar Ice Sounders IEEE Transactions on Geoscience and Remote Sensing Culberg, R., Schroeder, D. M. 2020: 1-18
  • STRONG POTENTIAL FOR THE DETECTION OF REFROZEN ICE LAYERS IN GREENLAND'S FIRN BY AIRBORNE RADAR SOUNDING Culberg, R., Schroeder, D. M., IEEE IEEE. 2020: 7033-7036
  • Radar-Detected Englacial Debris in the West Antarctic Ice Sheet GEOPHYSICAL RESEARCH LETTERS Winter, K., Woodward, J., Ross, N., Dunning, S. A., Hein, A. S., Westoby, M. J., Culberg, R., Marrero, S. M., Schroeder, D. M., Sugden, D. E., Siegert, M. J. 2019
  • RADAR SCATTERING IN FIRN AND ITS IMPLICATIONS FOR VHF/UHF ORBITAL ICE SOUNDING Culberg, R., Schroeder, D. M., IEEE IEEE. 2019: 4137–40