Model Investigation of Ice Stream/Subglacial Lake Systems

Sergienko/0838811该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。冰下水系 一套不同维度和复杂性的数值模型将被构建在一个连续的，分层的方式来制定和测试假设冰下湖泊如何形成冰流，确定冰下湖泊对冰流流量和质量平衡的影响，并确定反馈效应，从而冰流？冰下水系统对环境扰动的反应既有稳定的也有不稳定的。 这项研究将解决南极冰流系统内唯一经观测证实的快速时间尺度过程之一。 该项目的智力价值在于，了解近接地线冰下湖泊的起源和后果是旨在预测南极短期变化的冰川学研究的优先事项。近期未来质量平衡。拟议工作的更广泛影响是，它将有助于更好地了解一个通过促进海平面上升而具有重要社会意义的系统。研究生参与该项目将提供学生？在地学数值模拟应用方面的培训和教育。

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.