Collaborative Research: Fluctuations of the West Antarctic Ice-Sheet in Relation to Lake History in Taylor Valley, Antarctica Since the Last Glacial Maximum

合作研究：自末次盛冰期以来西南极冰盖的波动与南极洲泰勒谷湖泊历史的关系

• 批准号: 0539983
• 负责人: Steven Arcone
• 金额: $ 3.6万
• 依托单位: Department of Army Cold Regions Research & Engineering Lab
• 依托单位国家: 美国
• 项目类别: Interagency Agreement
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-07-15 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0539983&HistoricalAwards=false
• 关键词: Collaborative; Research; Fluctuations; West; Antarctic

0540073PrenticeThis award supports a project to examine the stratigraphy of near-surface sediments in Taylor Valley, Antarctica. Two contrasting hypotheses have been proposed for surface sediments in lower Taylor Valley, which have important and very different implications for how the West Antarctic Ice Sheet (WAIS) responded to the sea-level rise of the last deglaciation and Holocene environmental changes. One hypothesis holds that the sediments, designated Ross I drift, directly reflect 10,000 14C-years of WAIS shrinkage in the Ross Sea during and perhaps driven by deglacial sea-level rise. The other hypothesis, holds that the Taylor sediments have little significance for WAIS change during the deglaciation. These two hypotheses reflect fundamentally different interpretations of the sediment record. Over the course of two field seasons and a third year at the home institutions, the project will test these two hypotheses using glacial geology, geochemistry, ground penetrating radar (GPR) at both 100 MHz and 400 MHz, and portable sediment coring. The intellectual merit of the proposed work is that it will test these two hypotheses and make novel use of the subsurface record that may result in new insights into WAIS sensitivity during the deglaciation. The study will also directly test the conclusion that Glacial Lake Washburn was much larger than previously proposed during the Last Glacial Maximum (LGM). This occurrence, if real, represents a stunning climate anomaly. Answers to these local ice sheet and lake questions directly pertain to larger scale issues concerning the influences of sea-level rise, climate change, and internal ice-sheet dynamics on the recession of the WAIS since the LGM. There are numerous broader impacts to this project. Understanding the glacial and lake history in the McMurdo Sound region has important implications for the role that the WAIS will play in future sea-level and global climate change. Moreover, the history of Taylor Valley has significance for the ecosystem studies currently being conducted by the LTER group. Lastly, during the course of the proposed research, the project will train two graduate and undergraduate students and the research will be featured prominently in the teaching of students.

0540073 PrenticeThis Award支持一个项目，以检查南极泰勒谷近地表沉积物的地层。已经提出了针对下泰勒山谷中的表面沉积物的两个对比假设，这些假设对南极冰盖（WAIS）如何响应了最后一次脱土和全新世的海平面上升，这对西南极冰盖（WAIS）的响应具有重要意义。一个假设认为，指定的罗斯一世的沉积物直接反映了在罗斯海中的10,000年14c年的WAIS收缩，也许是由冰流冰层海平面上升驱动的。另一个假设认为，泰勒沉积物对脱胶过程中的wais变化几乎没有意义。 这两个假设反映了沉积物记录的根本不同的解释。在两个田间季节和家庭机构的第三年的过程中，该项目将使用冰川地质，地球化学，100 MHz和400 MHz的地面穿透性雷达（GPR）以及便携式沉积物芯来检验这两个假设。提出的工作的智力优点是，它将检验这两个假设，并对地下记录进行新颖的使用，这可能会导致对脱胶过程中WAIS敏感性的新见解。该研究还将直接检验以下结论：冰川湖沃什伯恩湖比以前在上次冰川最大（LGM）中提出的要大得多。如果真实的话，这种情况代表了令人惊叹的气候异常。这些当地的冰盖和湖泊问题的答案直接涉及有关LGM以来对海洋衰退的海平面上升，气候变化和内部冰上动态影响的大规模问题。该项目有许多更广泛的影响。 了解McMurdo Sound地区的冰川和湖泊历史对WAI在未来的海平面和全球气候变化中所扮演的角色具有重要意义。此外，泰勒河谷的历史对于目前由LTER组进行的生态系统研究具有重要意义。最后，在拟议的研究过程中，该项目将培训两名毕业生和本科生，该研究将在学生的教学中突出。