IEDA
Project Information
Collaborative Research: Synthesis of Thwaites Glacier Dynamics: Diagnostic and Prognostic Sensitivity Studies of a West Antarctic Outlet System
Description/Abstract
This award supports a three-year study to isolate essential physical processes affecting Thwaites Glacier (TG) in the Amundsen Sea Embayment (ASE) of West Antarctica using a suite of existing numerical models in conjunction with existing and International Polar Year (IPY)-proposed data sets. Four different models will be utilized to explore the effects of embayment geometry, ice-shelf buttressing, basal-stress distribution, surface mass balance, surface climate, and inland dynamic perturbations on the present and future dynamics of TG. This particular collection of models is ideally suited for the broad nature of this investigation, as they incorporate efficient and complementary simplifications of the stress field (shallow-ice and shelf-stream), system geometry (1-d and 2-d plan-view and flowline; depth-integrated and depth-dependent), and mass-momentum energy coupling (mechanical and thermo-mechanical). The models will be constrained and validated by data sets (including regional maps of ice thickness, surface elevation, basal topography, ice surface velocity, and potential fields) and geophysical data analyses (including increasing the spatial resolution of surface elevations, improving regional estimates of geothermal flux, and characterizing the sub-glacial interface of grounded ice as well as the grounding-zone transition between grounded and floating ice). The intellectual merit of the research focuses on several of the NSF Glaciology program's emphases, including: ice dynamics, numerical modeling, and remote sensing of ice sheets. In addition, the research directly addresses the following specific NSF objectives: "investigation of the physics of fast glacier flow with emphasis on processes at glacier beds"; "investigation of ice-shelf stability"; and "identification and quantification of the feedback between ice dynamics and climate change". The broader impacts of this research effort will help answer societally relevant questions of future ice sheet stability and sea-level change. The research also will aid in the early career development of two young investigators and will contribute to the education of both graduate and undergraduate students directly involved in the research, and results will be incorporated into courses and informal presentations.
Personnel
Person Role
Carter, Sasha P. Investigator
Dupont, Todd K. Co-Investigator
Holt, John W. Co-Investigator
Morse, David L. Co-Investigator
Parizek, Byron R. Investigator
Young, Duncan A. Co-Investigator
Kempf, Scott D. Co-Investigator
Blankenship, Donald D. Investigator
Funding
Antarctic Glaciology Award # 0758274
Antarctic Glaciology Award # 0636724
Data Management Plan
None in the Database
Publications
  1. Walker, R. T., Christianson, K., Parizek, B. R., Anandakrishnan, S., & Alley, R. B. (2012). A viscoelastic flowline model applied to tidal forcing of Bindschadler Ice Stream, West Antarctica. Earth and Planetary Science Letters, 319-320, 128–132. (doi:10.1016/j.epsl.2011.12.019)
  2. Nowicki, S., Bindschadler, R. A., Abe-Ouchi, A., Aschwanden, A., Bueler, E., Choi, H., … Wang, W. L. (2013). Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project I: Antarctica. Journal of Geophysical Research: Earth Surface, 118(2), 1002–1024. (doi:10.1002/jgrf.20081)
  3. Nowicki, S., Bindschadler, R. A., Abe-Ouchi, A., Aschwanden, A., Bueler, E., Choi, H., … Wang, W. L. (2013). Insights into spatial sensitivities of ice mass response to environmental change from the SeaRISE ice sheet modeling project II: Greenland. Journal of Geophysical Research: Earth Surface, 118(2), 1025–1044. (doi:10.1002/jgrf.20076)
  4. Lampkin, D. J., Amador, N., Parizek, B. R., Farness, K., & Jezek, K. (2013). Drainage from water-filled crevasses along the margins of Jakobshavn Isbrae: A potential catalyst for catchment expansion. Journal of Geophysical Research: Earth Surface, 118(2), 795–813. (doi:10.1002/jgrf.20039)
  5. Damiani, T. M., Jordan, T. A., Ferraccioli, F., Young, D. A., & Blankenship, D. D. (2014). Variable crustal thickness beneath Thwaites Glacier revealed from airborne gravimetry, possible implications for geothermal heat flux in West Antarctica. Earth and Planetary Science Letters, 407, 109–122. (doi:10.1016/j.epsl.2014.09.023)
  6. Schroeder, D. M., Blankenship, D. D., Raney, R. K., & Grima, C. (2015). Estimating Subglacial Water Geometry Using Radar Bed Echo Specularity: Application to Thwaites Glacier, West Antarctica. IEEE Geoscience and Remote Sensing Letters, 12(3), 443–447. (doi:10.1109/lgrs.2014.2337878)
  7. Schroeder, D. M., Blankenship, D. D., Young, D. A., Witus, A. E., & Anderson, J. B. (2014). Airborne radar sounding evidence for deformable sediments and outcropping bedrock beneath Thwaites Glacier, West Antarctica. Geophysical Research Letters, 41(20), 7200–7208. (doi:10.1002/2014gl061645)

This project has been viewed 17 times since May 2019 (based on unique date-IP combinations)