USAP-DC

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Model Investigation of Ice Stream/Subglacial Lake Systems Description/Abstract Sergienko/0838811 This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). This award supports a project to conduct a modeling study of the ice stream ? sub-glacial water system. A suite of numerical models of various dimensionality and complexity will be constructed in a sequential, hierarchical fashion to formulate and test hypotheses regarding how sub-glacial lakes form under ice streams, determine the effect of sub-glacial lakes on ice-stream flow and mass balance, and to determine feedback effects whereby the ice stream ? sub-glacial water system can elicit both stable and unstable responses to environmental perturbations. This research will address one of the only observationally verified fast-time-scale processes apparent within the Antarctic Ice Stream system. The intellectual merit of the project is that understanding the origins and consequences of near-grounding-line sub-glacial lakes is a priority in glaciological research designed to predict short-term variations in Antarctica?s near-term future mass balance. The broader impacts of the proposed work are that it will contribute to better understanding of a system that has important societal relevance through contribution to sea level rise. Participation of a graduate student in the project will provide the student?s training and education in application of the numerical modeling in geosciences. Personnel Person Role Sergienko, Olga Investigator Hulbe, Christina Co-Investigator Funding Antarctic Glaciology Award # 0838811 AMD - DIF Record(s) NSIDC-0583_1 sergienko_0838811 Data Management Plan None in the Database Product Level: Not provided Datasets Repository Title (link) Format(s) Status USAP-DC Interaction of Ice Stream Flow with Heterogeneous Beds netCDF exist Publications Sergienko, O. V. (2012). The effects of transverse bed topography variations in ice-flow models. Journal of Geophysical Research: Earth Surface, 117(F3), n/a–n/a. (doi:10.1029/2011jf002203) Sergienko, O. V., Goldberg, D. N., & Little, C. M. (2013). Alternative ice shelf equilibria determined by ocean environment. Journal of Geophysical Research: Earth Surface, 118(2), 970–981. (doi:10.1002/jgrf.20054) Sergienko, O. V. (2013). Basal channels on ice shelves. Journal of Geophysical Research: Earth Surface, 118(3), 1342–1355. (doi:10.1002/jgrf.20105) Keywords Basal Stress Direct Numerical Simulation Ice Stream Subglacial And Supraglacial Water Depth Platforms and Instruments