A GIS database and Map of Marine and Terrestrial Glacial Features Related to Mid- to Late-Pleistocene Arctic Ocean Glaciation

与中更新世北冰洋冰川作用相关的海洋和陆地冰川特征GIS数据库和地图

• 批准号: 2203061
• 负责人: Louise Farquharson
• 金额: $ 23万
• 依托单位: University of Alaska Fairbanks Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-05-01 至 2026-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2203061&HistoricalAwards=false
• 关键词: GIS; database; Map; Marine; Terrestrial

The Arctic is now at the frontline of climate change as surface air temperatures warm twice as fast as the rest of the globe. Unprecedented reductions in sea ice cover are pushing the Arctic into unknown conditions. Among the most critical components of the cryosphere are high-latitude glaciers, which hold more than 99% of the world’s fresh water. These glaciers are inherently unstable and thus sensitive to climate change. We can look to how glacial systems responded to climate change in the past to better understand future glacier dynamics and to constrain future projections of glacial contributions to sea level rise. Evidence is building in support of a thick ice-sheet that spanned the Arctic Ocean, possibly multiple times, during the past 130,000 years. This project aims to bring together a diverse array of geologic evidence from the Arctic Ocean and the surrounding coastal plains, to explore the timing and extent of Arctic Ocean glaciation during the mid- to late-Pleistocene. This research will help us better understand whether an Arctic Ocean wide ice sheet existed in the past, which will in turn help us better understand future ice sheet changes.Ice sheets and ice shelves at high latitudes are of particular interest in understanding future glacier dynamics because geologic records suggest that they may advance and retreat out-of-phase with glaciers at mid-latitudes due to moisture limitations in full glacial conditions. As such, high-latitude glaciation may display non-intuitive behavior in response to climate change. The main objective of the project is to improve our understanding of the extent of glaciation in the western Arctic Ocean during the mid to late Pleistocene and to identify the main sources of ice that contributed to ice-sheet build up. The project will build a geographic information system database of previously collected geologic evidence of Arctic Ocean glaciation in the Beaufort-Chukchi region, allowing researchers to test the hypothesis that glaciation was extensive in the western Arctic Ocean at several points during the Pleistocene. Existing datasets that will be synthesized from data archives, publications and reports include (1) marine survey data from hull mounted chirp and multibeam sonars collected by numerous scientific cruises to the region, (2) marine sediment cores, and (3) terrestrial records of glacial erratic boulders and ancient raised beach ridges. Results from this research will improve our understanding of how high-latitude ice sheets can behave during periods of climatic change. This project will support one MSc student and a female early career PI.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

北极现在处于气候变化的最前沿，因为海冰覆盖面积前所未有的减少正在将北极推向未知的状况，其中最关键的部分是高-。纬度冰川拥有世界上 99% 以上的淡水，这些冰川本质上是不稳定的，因此对气候变化很敏感。我们可以研究冰川系统过去如何应对气候变化，以更好地了解未来。冰川动态并限制未来对冰川对海平面上升的影响的预测正在建立证据支持过去 13 万年期间可能多次跨越北冰洋的厚冰盖。来自北冰洋和周围沿海平原的一系列地质证据，以探索中更新世中晚期北冰洋冰川作用的时间和范围。这项研究将帮助我们更好地了解北冰洋是否存在广阔的冰盖。过去存在的，这反过来将帮助我们更好地了解未来的冰盖变化。高纬度的冰盖和冰架对于了解未来的冰川动态特别感兴趣，因为地质记录表明它们可能会异相前进和后退由于全冰川条件下的水分限制，中纬度地区的冰川可能会表现出非直观的气候变化行为，该项目的主要目标是提高我们对冰川作用范围的了解。该项目将建立一个地理信息系统数据库，其中包含以前收集的波弗特北冰洋冰川作用的地质证据。 -楚科奇地区，使研究人员能够检验更新世期间北冰洋西部多个地点的冰川作用广泛的假设，现有数据集将从数据档案、出版物和报告中合成，包括（1）海洋调查。来自船体安装的啁啾和多波束声纳的数据是通过对该地区的多次科学航行收集的，(2)海洋沉积物岩心，以及(3)冰川飘忽不定的巨石和古代凸起的海滩山脊的陆地记录，这项研究的结果将提高我们对如何进行了解。高纬度冰盖在气候变化期间的表现该项目将支持一名理学硕士学生和一名女性早期职业 PI。该奖项反映了 NSF 的法定使命，并被认为值得通过以下方式获得支持。使用基金会的智力价值和更广泛的影响审查标准进行评估。