Collaborative research: A new reconstruction of the last West Antarctic Ice Sheet deglaciation in the Ross Sea

合作研究：罗斯海最后一次西南极冰盖消融的新重建

• 批准号: 1042974
• 负责人: Nathaniel Lifton
• 金额: $ 5.53万
• 依托单位: Purdue University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1042974&HistoricalAwards=false
• 关键词: Collaborative; research; new; reconstruction; last

1043517/ClarkThis award supports a project to develop a better understanding of the response of the WAIS to climate change. The timing of the last deglaciation of the western Ross Sea will be improved using in situ terrestrial cosmogenic nuclides (3He, 10Be, 14C, 26Al, 36Cl) to date glacial erratics at key areas and elevations along the western Ross Sea coast. A state-of-the art ice sheet-shelf model will be used to identify mechanisms of deglaciation of the Ross Sea sector of WAIS. The model results and forcing will be compared with observations including the new cosmogenic data proposed here, with the aim of better determining and understanding the history and causes of WAIS deglaciation in the Ross Sea. There is considerable uncertainty, however, in the history of grounding line retreat from its last glacial maximum position, and virtually nothing is known about the timing of ice- surface lowering prior to ~10,000 years ago. Given these uncertainties, we are currently unable to assess one of the most important questions regarding the last deglaciation of the global ice sheets, namely as to whether the Ross Sea sector of WAIS contributed significantly to meltwater pulse 1A (MWP-1A), an extraordinarily rapid (~500-year duration) episode of ~20 m sea-level rise that occurred ~14,500 years ago. The intellectual merit of this project is that recent observations of startling changes at the margins of the Greenland and Antarctic ice sheets indicate that dynamic responses to warming may play a much greater role in the future mass balance of ice sheets than considered in current numerical projections of sea level rise. The broader impacts of this work are that it has direct societal relevance to developing an improved understanding of the response of the West Antarctic ice sheet to current and possible future environmental changes including the sea-level response to glacier and ice sheet melting due to global warming. The PI will communicate results from this project to a variety of audiences through the publication of peer-reviewed papers and by giving talks to public audiences. Finally the project will support a graduate student and undergraduate students in all phases of field-work, laboratory work and data interpretation.

1043517/Clarkthis Award支持一个项目，以更好地了解WAIS对气候变化的反应。使用原位陆地宇宙核素（3HE，10BE，14C，26AL，36Cl），西部罗斯海最后一次脱位的时机将改善，迄今为止，在西部罗斯海沿岸的关键区域和海拔高度。 最先进的冰盖架模型将用于确定WAIS Ross Sea Seector脱胶的机制。将模型结果和强迫与观察结果进行比较，包括此处提出的新宇宙基因数据，以更好地确定和理解罗斯海中Wais脱气的历史和原因。然而，在接地线从其最后一次冰川最大位置撤退的历史中存在很大的不确定性，几乎没有关于冰层降低的时机在〜10，000年前降低的时机。鉴于这些不确定性，我们目前无法评估有关全球冰盖最后一次脱气的最重要问题之一，即，关于WAIS的罗斯海域是否对甲壳虫脉冲1A（MWP-1A）的贡献是显着贡献，这是一个非常快速的（〜500年年度持续时间），这是〜20 m sea-level升级的〜20 m ease lip stip the live the the the the the the the the the the at 〜14,500 〜14,500。该项目的智力优点在于，最近观察到格陵兰岛和南极冰盖边缘令人震惊的变化的观察表明，对变暖的动态反应在未来的冰盖质量平衡中的作用可能比当前海平面上升的数值预测中所考虑的要大得多。这项工作的更广泛的影响是，它与对南极冰盖对当前和未来可能的环境变化的反应有了改进的理解具有直接的社会意义，包括由于全球变暖而导致的冰川和冰盖融化的海平面反应。 PI将通过出版同行评审的论文并向公众观众进行会谈，将该项目的结果传达给各种受众。 最终，该项目将在现场工作，实验室工作和数据解释的各个阶段支持研究生和本科生。