Collaborative Research: Sensitivity of local glaciers in central East Greenland to Holocene climate change

合作研究：格陵兰东部中部当地冰川对全新世气候变化的敏感性

• 批准号: 0909270
• 负责人: Meredith Kelly
• 金额: $ 26.16万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0909270&HistoricalAwards=false
• 关键词: Collaborative; Research; Sensitivity; local; glaciers

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This award will support an investigation of Holocene glacier fluctuations in the Scoresby Sund region of central East Greenland (~70-72°N, 22-28°W) along a transect from a coastal maritime setting to the continental conditions adjacent to the Greenland Ice Sheet. The 'Intellectual Merit' of the proposed study lies in the potential to affirm, or otherwise, the widely-held view that the scale of glacier and ice sheet change being observed today in Greenland is not unique in the Holocene. The current recession of glaciers in the Scoresby Sund region is exposing sub-fossil vegetation that grew at times when glaciers were smaller than at present. These emerging records yield a rare opportunity to examine both the biota of these warm times and, more critically, the response of the glaciers to temperatures as high as, or higher than, at present. Development of a chronology for a network of sites in the Scoresby Sund region, including a site adjacent to the Renland ice core, across an environmental gradient can provide insights into recent patterns of ice sheet distribution. However, to place these in context requires a longer temporal framework. Thus, two additional objectives emerge. First, compare late-Holocene glacier fluctuations in Greenland with glacier fluctuations in other mid-to-high Northern Hemisphere locations. This will assess whether glaciers in Greenland are more or less sensitive than their counterparts in other high-latitude locations. Second, document a continuous pattern of glacier fluctuations in Greenland during Holocene time. When contrasted with paleoclimate indicators, such as the GRIP borehole paleotemperature record, how Scoresby Sund glaciers responded to warmer-than-present times, such as the so-called Holocene Climatic Optimum (~5000-9000 years ago), can be assessed. The proposed study has numerous 'Broader Impacts'. It will contribute to the educational development of graduate and undergraduate students at Dartmouth College, the University of Maine, and the University of Cincinnati, and tie in with the IGERT program at Dartmouth College. The PIs will also visit elementary schools and present public lectures on climate change. The results of the study will be added to an interactive, Web-based learning system and stand-alone kiosk deployed at Acadia National Park.

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该奖项将支持对格陵兰中部东部Scoresby Sund地区（~70-72°N, 22-28°W）全新世冰川波动的研究，该地区沿着从沿海海洋环境到格陵兰冰盖附近大陆条件的样带。这项拟议研究的“学术价值”在于有可能肯定或否定一个广泛持有的观点，即今天在格陵兰岛观测到的冰川和冰盖变化的规模在全新世并非独一无二。斯科兹比桑德地区目前的冰川消退正在暴露出在冰川比现在小的时候生长的亚化石植被。这些新出现的记录提供了一个难得的机会，既可以研究这些温暖时期的生物群，更重要的是，可以研究冰川对与当前温度相同或更高的温度的反应。为Scoresby Sund地区的一个站点网络开发年表，包括一个毗邻Renland冰芯的站点，跨越环境梯度，可以深入了解冰盖分布的最新模式。然而，要把这些放在上下文中需要一个更长的时间框架。因此，出现了两个额外的目标。首先，将格陵兰岛晚全新世冰川波动与北半球其他中高位置的冰川波动进行比较。这将评估格陵兰岛的冰川是否比其他高纬度地区的冰川更敏感。其次，记录全新世期间格陵兰岛冰川波动的连续模式。当与古气候指标（如GRIP钻孔古温度记录）对比时，可以评估Scoresby Sund冰川对比现在更温暖的时期（如所谓的全新世气候最佳时期（~5000-9000年前））的反应。拟议的研究有许多“更广泛的影响”。它将为达特茅斯学院、缅因大学和辛辛那提大学的研究生和本科生的教育发展做出贡献，并与达特茅斯学院的IGERT项目相结合。他们还将访问小学，并就气候变化问题进行公开演讲。这项研究的结果将被添加到一个交互式的、基于网络的学习系统和部署在阿卡迪亚国家公园的独立信息亭中。