Collaborative Research: Behavior of Supraglacial Lakes and Their Role in Outlet Glacier Dynamics and Mass Balance of the Greenland Ice Sheet

合作研究：冰上湖泊的行为及其在格陵兰冰盖出口冰川动力学和质量平衡中的作用

• 批准号: 0520077
• 负责人: Sarah Das
• 金额: --
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-10-01 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0520077&HistoricalAwards=false
• 关键词: Collaborative; Research; Behavior; Supraglacial; Lakes

ABSTRACTDasOPP-0520077JoughinOPP-0520382 This is a collaborative proposal by Principal Investigators from the University of Washington and Woods Hole Oceanographic Institution. This proposal has also been submitted to NASA and will be jointly funded by OPP and NASA. The Principal Investigators will use geophysical field measurements and remote sensing to investigate the role of Greenland's supraglacial lakes in delivering melt water to the ice sheet's bed and in modulating ice flow on short time scales. Recent results demonstrate a correlation between ice velocity and surface melt draining through moulins to the bed, which may provide a mechanism for rapid response of the Greenland Ice Sheet (GIS) to climate change. Supraglacial lakes are one of the critical links between surface melting and enhanced basal flow, have the potential to rapidly respond to future climate change, and are the focus of the research project described here.Intellectual Merit: The major result of this project will be significant new knowledge about the formation and dynamics of Greenland's supraglacial lakes and the role of surface melt and lake drainage in modulating ice sheet flow. Over the entire GIS, the project's results will provide the first clear understanding of where and why lakes form around Greenland, the total melt-water volume stored in these lakes, and their relationship to outlet glacier drainage basins. Over the dynamic and climatically sensitive Jakobshavn region, the results will show the interannual variability in lake systems and the available melt water flux from supraglacial lakes to the ice sheet's bed. These observations will be used to test emerging hypotheses concerning the role of supraglacial lakes in moulin formation. New observations of how local and regional climate control lake behavior will yield insight into the potential for lake systems to respond to future climate change. Ground-based measurements and experiments will: 1) allow account for the role of lake drainage in ice flow variability, 2) relate local climate controls to changing lake volume and moulin formation, and 3) provide better constraint on how models predict future ice sheet response to climate change. Broader Impacts: Arctic change and Greenland's contribution to sea level rise is of great societal interest and concern. The results of this research will be disseminated to the public through ongoing Principal Investigator efforts including K-12 classroom visits, web sites, press interviews, and other opportunities. Results will be of immediate interest to scientists working to understand past and future changes to the GIS. They will present results in specialized journals and conferences, and will speak in departmental seminars that reach a broad cross-section of the earth science community. This research will contribute to the establishment of a new glaciological program at WHOI and to new collaborations at UW.

这是由华盛顿大学和伍兹霍尔海洋研究所的主要研究人员合作提出的一项建议。 这一提议也已提交给NASA，将由NASA和NASA共同资助。 主要研究人员将使用地球物理场测量和遥感来调查格陵兰岛的冰上湖泊在将融水输送到冰盖床和在短时间尺度上调节冰流方面的作用。最近的研究结果表明，冰的速度和表面融化排水通过冰臼床，这可能提供了一种机制，格陵兰冰盖（GIS）对气候变化的快速反应之间的相关性。冰上湖是表面融化和增强的基底流之间的关键环节之一，有可能迅速应对未来的气候变化，是这里描述的研究项目的重点。智力优点：这个项目的主要结果将是显着的新知识的形成和动态格陵兰岛的冰上湖和表面融化和湖泊排水调节冰盖流动的作用。在整个地理信息系统中，该项目的结果将首次清楚地了解格陵兰周围湖泊的形成地点和原因，这些湖泊中储存的融水总量，以及它们与出口冰川流域的关系。在动态和气候敏感的雅各布港地区，结果将显示湖泊系统的年际变化和可用的融水通量从冰上湖冰盖的床。 这些观测结果将被用来测试新出现的假设冰臼形成的作用冰上湖。对当地和区域气候如何控制湖泊行为的新观察将深入了解湖泊系统应对未来气候变化的潜力。基于地面的测量和实验将：1）考虑到湖泊排水在冰流变化中的作用，2）将当地气候控制与变化的湖泊体积和冰臼形成联系起来，3）为模型预测未来冰盖对气候变化的反应提供更好的约束。更广泛的影响：北极的变化和格陵兰岛对海平面上升的贡献是巨大的社会利益和关注。这项研究的结果将通过正在进行的主要研究者的努力，包括K-12教室访问，网站，新闻采访和其他机会向公众传播。研究结果将立即引起科学家的兴趣，以了解过去和未来的变化的地理信息系统。 他们将在专业期刊和会议上展示成果，并将在地球科学界广泛的部门研讨会上发言。这项研究将有助于在WHOI建立一个新的冰川学计划，并在华盛顿大学建立新的合作。