COLLABORATIVE RESEARCH: Terrestrial Exposure-Age Constraints on the last Glacial Maximum Extent of the Antarctic Ice Sheet in the Western Ross Sea

合作研究：西罗斯海南极冰盖末次冰期最大范围的陆地暴露年龄限制

基本信息

批准号：
1341364
负责人：
Claire Todd
金额：
$ 11.02万
依托单位：
Pacific Lutheran University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2014
资助国家：
美国
起止时间：
2014-08-01 至 2017-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1341364&HistoricalAwards=false
关键词：
COLLABORATIVE RESEARCH Terrestrial Exposure Age

项目摘要

The investigators will map glacial deposits and date variations in glacier variability at several ice-free regions in northern Victoria Land, Antarctica. These data will constrain the nature and timing of past ice thickness changes for major glaciers that drain into the northwestern Ross Sea. This is important because during the Last Glacial Maximum (15,000 - 18,000 years ago) these glaciers were most likely flowing together with grounded ice from both the East and West Antarctic Ice Sheets that expanded across the Ross Sea continental shelf to near the present shelf edge. Thus, the thickness of these glaciers was most likely controlled in part by the extent and thickness of the Ross Sea ice sheet and ice shelf. The data the PIs propose to collect can provide constraints on the position of the grounding line in the western Ross Sea during the Last Glacial Maximum, the time that position was reached, and ice thickness changes that occurred after that time. The primary intellectual merit of this project will be to improve understanding of a period of Antarctic ice sheet history that is relatively unconstrained at present and also potentially important in understanding past ice sheet-sea level interactions. This proposal will support an early career researcher's ongoing program of undergraduate education and research that is building a socio-economically diverse student body with students from backgrounds underrepresented in the geosciences. This proposal will also bring an early career researcher into Antarctic research.

研究人员将绘制冰川沉积物和南极北部维多利亚州北部几个无冰区域的冰川变异性的日期变化。这些数据将限制过去冰厚度变化的性质和时机，这些变化的主要冰川进入了西北罗斯海。这很重要，因为在最后的冰川最大值（15,000-18，000年前），这些冰川很可能与来自东部和南极冰盖的地面冰一起流动，这些冰块遍布罗斯海大陆架延伸到目前的架子边缘。因此，这些冰川的厚度很可能部分由罗斯海冰板和冰架的程度和厚度控制。 PI提议收集的数据可以在最后一次冰川最大值，达到位置的时间以及在此之后发生的冰厚发生变化的情况下，在西罗斯海的接地线位置提供约束。该项目的主要智力优点是提高对目前相对不受欢迎的南极冰盖历史时期的理解，并且在理解过去的冰盖海平面相互作用方面也可能很重要。该建议将支持一项早期的职业研究员正在进行的本科教育和研究计划，该计划正在建立一个社会经济多样化的学生团体，其背景的学生在地球科学中的代表不足。该提案还将将早期的职业研究员带入南极研究。