EAR-PF: Developing early Holocene records of terrestrial climate in Baffin Bay to understand ice sheet response time to climate change

EAR-PF：开发巴芬湾全新世早期陆地气候记录，以了解冰盖对气候变化的响应时间

• 批准号: 1349595
• 负责人: Elizabeth Thomas
• 金额: $ 8.7万
• 依托单位: Thomas Elizabeth K
• 依托单位国家: 美国
• 项目类别: Fellowship Award
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-11-01 至 2017-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1349595&HistoricalAwards=false
• 关键词: EAR; PF; Developing; early; Holocene

Dr. Elizabeth K. Thomas has been awarded an NSF Earth Sciences Postdoctoral Fellowship to conduct research and outreach at the University of Massachusetts, Amherst and the State University of New York at Buffalo. She will reconstruct climate change of the early Holocene (7-10 thousand years ago) on western Greenland and eastern Baffin Island to better constrain the factors that control ice sheet margin change. Understanding the speed and nature of ice sheet response to climate change is at the forefront of the scientific community and public interest, as this is a major uncertainty of state-of-the-art sea level rise predictions. Dr. Thomas' research will place constraints on the speed and nature of ice sheet response to climate change on human-relevant timescales, with direct benefits to communities working to adapt to sea level rise. Dr. Thomas will broaden participation in Earth Sciences by mentoring undergraduate researchers and developing outreach programs in Amherst, MA and Buffalo, NY, communities with significant populations that are underrepresented in Earth Science. Both of these communities lie near features deposited by the Laurentide Ice Sheet thousands of years ago, and thus provide natural laboratories for learning about ice sheets and discussing challenges that scientists and society face today regarding climate change, ice sheets, and sea level rise.Quantifying ice sheet responses to climate change is critical for predicting sea level rise in a warming world. During the early Holocene, the Baffin Bay sectors of the Laurentide and Greenland ice sheets advanced rapidly and dramatically, likely in response to abrupt (10s to 100s of years) climate changes at 9.3 and 8.2 ka. The character of early Holocene decadal-scale temperature and precipitation changes in the Baffin Bay region remains unknown, however, so direct comparison of climate and ice sheet reconstructions currently is not possible. Dr. Thomas will use organic compounds (branched glycerol dialkyl glycerol tetraethers and leaf wax hydrogen isotopes) preserved in lake sediments near the margins of the Greenland and Laurentide ice sheets to reconstruct decadal-scale temperature and precipitation changes. She will then compare the climate reconstructions to ice sheet reconstructions to elucidate ice sheet response time to climate change.

伊丽莎白·K博士托马斯已被授予美国国家科学基金会地球科学博士后奖学金，在马萨诸塞州大学，阿默斯特和纽约布法罗的州立大学进行研究和推广。她将重建格陵兰岛西部和巴芬岛东部全新世早期（7- 1万年前）的气候变化，以更好地限制控制冰盖边缘变化的因素。了解冰盖对气候变化的反应速度和性质是科学界和公众利益的最前沿，因为这是最先进的海平面上升预测的主要不确定性。托马斯博士的研究将限制冰盖对人类相关时间尺度上气候变化的反应速度和性质，直接有利于努力适应海平面上升的社区。托马斯博士将通过指导本科研究人员和开发阿默斯特，麻州和布法罗，纽约州，社区与地球科学代表性不足的人口显著拓展计划，扩大在地球科学的参与。这两个群落都位于数千年前劳伦泰德冰盖沉积的特征附近，因此为了解冰盖和讨论科学家和社会今天面临的关于气候变化、冰盖和海平面上升的挑战提供了天然实验室。量化冰盖对气候变化的反应对于预测全球变暖中的海平面上升至关重要。在全新世早期，巴芬湾部门的Laurentide和格陵兰冰盖的进展迅速，戏剧性的，可能在9.3和8.2万年的气候变化突然（10年代至100年代）。然而，巴芬湾地区全新世早期十年尺度温度和降水变化的特征仍然未知，因此目前不可能直接比较气候和冰盖重建。托马斯博士将使用保存在格陵兰岛和劳伦泰德冰盖边缘附近湖泊沉积物中的有机化合物（支链甘油二烷基甘油四醚和叶蜡氢同位素）来重建十年尺度的温度和降水变化。然后，她将比较气候重建冰盖重建阐明冰盖对气候变化的反应时间。

项目成果

Early Holocene Laurentide Ice Sheet Retreat Influenced Summer Atmospheric Circulation in Baffin Bay

• DOI: 10.1029/2023gl103428
• 发表时间: 2023-06
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: E. Thomas;A. Cluett;M. Erb;N. McKay;J. Briner;I. Castañeda;M. Corcoran;O. Cowling;D. Gorbey-D.-Go