Collaborative Research: Petermann Gletscher, Greenland - Paleoceanography and Paleoclimatology

合作研究：Petermann Gletscher，格陵兰岛 - 古海洋学和古气候学

• 批准号: 1417787
• 负责人: Larry Mayer
• 金额: $ 24.93万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-11-01 至 2018-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1417787&HistoricalAwards=false
• 关键词: Collaborative; Research; Petermann; Gletscher; Greenland

This project will take a multi-disciplinary approach to understanding the response of Petermann Glacier in northern Greenland to climate change in the past. Petermann Glacier drains a significant fraction of the northern Greenland ice sheet and terminates in a large floating ice shelf that is sensitive to ice-ocean interactions. Ice retreat over the last decade opens access to the fjord and presents an opportunity to understand sedimentation processes under the area previously covered by ice shelf and to calibrate reconstructions of past ice shelf variations. Using a variety of technologies and approaches on land, ice, and at sea, the investigators will map the bottom of the fjord in front of and under the ice shelf; reconstruct ocean conditions and their role in ice shelf variations through time; reconstruct the past extent of the glacier on land and the floating ice shelf; and reconstruct local relative sea level. Together these efforts will create a comprehensive picture of the climate conditions and response of the Petermann Glacier to these conditions over the last 10,000 years.Of key interest will be the timing, extent, rates of change, and variability (on land and in the sea) during the early Holocene when local relative sea level was over 100 meters higher than today (due to lagging isostatic rebound of the crust in response to deglaciation), but the inland ice sheet was still large relative to today. The investigators will address dynamic responses to multiple interacting variables over a range of response times (from tens to thousands of years) relevant to potential future impacts. Specific research questions include: 1) How sensitive is Petermann ice shelf extent to documented climate changes within the Holocene? 2) Is shelf response independent of, or linked to, variations in the grounded Petermann Glacier, ocean thermal conditions, or relative sea level (i.e., sill depth)? 3) What are the rates of change and variability of these systems in response to early Holocene warming, Neoglacial cooling, and recent warming? The project will support several young investigators and will provide them with both ship and land-based training experiences. The project includes significant international collaborations, with substantial in-kind contributions from non-U.S. sources that add value to the project. Planned outreach includes teacher participation in the field program and meaningful classroom involvement at several levels.

该项目将采用多学科方法来了解格陵兰岛北部彼得曼冰川过去对气候变化的反应。彼得曼冰川排干了格陵兰岛北部冰盖的很大一部分，终止于一个对冰-海洋相互作用敏感的大型浮动冰架。过去十年的冰退缩开辟了通往峡湾的通道，并提供了了解先前被冰架覆盖的区域下的沉积过程和校准过去冰架变化的重建的机会。研究人员将利用陆地、冰上和海上的各种技术和方法，绘制冰架前和冰架下峡湾底部的地图；重建海洋状况及其在冰架随时间变化中的作用；重建陆地上冰川和漂浮冰架过去的范围；并重建当地相对海平面。这些努力将共同描绘出过去一万年的气候条件以及彼得曼冰川对这些条件的响应的全面图景。重点关注的是变化的时间、范围、速率和变异性（陆地和海洋） ）在全新世早期，当时当地相对海平面比今天高出100多米（由于地壳响应冰消退的滞后均衡回弹），但内陆冰盖相对于今天仍然很大。研究人员将在与未来潜在影响相关的一系列响应时间（从数十年到数千年）内解决对多个相互作用变量的动态响应。具体的研究问题包括：1）彼得曼冰架范围对全新世记录的气候变化有多敏感？ 2) 陆架响应与接地彼得曼冰川、海洋热条件或相对海平面（即窗台深度）的变化无关还是相关？ 3）这些系统对全新世早期变暖、新冰期变冷和近期变暖的反应的变化率和变异率是多少？该项目将支持几名年轻的研究人员，并为他们提供舰载和陆基培训经验。该项目包括重要的国际合作，以及来自非美国来源的大量实物捐助，为该项目增加了价值。计划的外展活动包括教师参与实地计划以及多个层面的有意义的课堂参与。