Collaborative Research: Integrated Study of East Antarctic Ice Sheet Tills (ISET): Tracers of Ice Flow and Proxies of the Ice-covered Continental Shield

合作研究：东南极冰盖蒂尔综合研究（ISET）：冰流示踪剂和冰覆盖大陆盾的替代物

• 批准号: 0440177
• 负责人: Lang Farmer
• 金额: $ 4.87万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-06-15 至 2008-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440177&HistoricalAwards=false
• 关键词: Collaborative; Research; Integrated; Study; East

This project studies till from the glaciers that drain the East Antarctic ice sheet through the Transantarctic Mountains into the Ross Embayment. Glaciers from both East and West Antarctica converge in this area, creating the Ross Ice Shelf, whose size is a sensitive indicator of global climate change. This work will determine till provenance through petrologic, geochemical, and isotopic studies. Its goal is to understand the flow paths of ice sheets into this area during the late Quaternary period, especially focused on the last glacial maximum approximately 18,000 yrs ago. This knowledge is critical to modeling ice sheet formation and behavior. While the East Antarctic ice sheet is considered stable, West Antarctica hosts rapidly flowing ice streams that may be affected by global climate change. The work will also improve our knowledge of the crustal rocks of East Antarctica. Covered by kilometer-thick ice sheets, its basic geology is largely unknown. The provenance studies will also be used in field-based curriculum workshops for Indiana Earth Science educators. Other broader impacts include graduate and undergraduate education, and improving society's understanding of global climate change. Antarctica's ice sheets play a pivotal role in atmospheric and oceanic circulation, and are key factors in sea-level rise. Models of ice sheet behavior rely on accurate reconstructions of past ice sheet configurations that this study will provide.

这个项目研究的冰川从南极东部冰盖通过南极横贯山脉进入罗斯海湾。东南极洲和西南极洲的冰川在这一地区汇合，形成了罗斯冰架，其大小是全球气候变化的敏感指标。这项工作将通过岩石学、地球化学和同位素研究来确定其来源。它的目标是了解晚第四纪时期进入该地区的冰盖的流动路径，特别是关注大约18,000年前的最后一次冰川高峰。这些知识对于模拟冰盖的形成和行为至关重要。虽然东南极洲冰盖被认为是稳定的，但西南极洲拥有快速流动的冰流，可能受到全球气候变化的影响。这项工作还将提高我们对东南极洲地壳岩石的认识。它被数公里厚的冰盖覆盖，其基本地质情况在很大程度上是未知的。来源研究也将用于印第安纳州地球科学教育者的实地课程研讨会。其他更广泛的影响包括研究生和本科教育，以及提高社会对全球气候变化的理解。南极洲的冰盖在大气和海洋环流中起着关键作用，也是海平面上升的关键因素。冰盖行为模型依赖于本研究将提供的对过去冰盖结构的精确重建。