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: 1418053
• 负责人: Alan Mix
• 金额: $ 145.36万
• 依托单位: Oregon State University
• 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 2019-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1418053&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.

该项目将采用一种多学科的方法来理解格陵兰北部北部冰川过去对气候变化的反应。 Petermann冰川排出了很大一部分格陵兰冰盖，并终止于对冰山相互作用敏感的大型浮冰架中。在过去的十年中，ICE撤退可以打开峡湾的访问权限，并提供了一个机会，可以理解冰架先前覆盖的区域下的沉积过程，并校准过去冰架变化的重建。调查人员使用各种技术和方法在冰架前和下方绘制峡湾的底部；重建海洋状况及其在冰架变化中的作用；重建冰川在陆地和浮冰架上的过去；并重建当地的相对海平面。这些努力将共同创造全面的描述，即彼得曼冰川对这些状况的响应在过去的10，000年中。关键的兴趣将是当地海平面在当地海平面比今天高100米以上的时间，较大的相对相对的相对相对的相对冰期的质量，在整个全新时期，当地海平面上的时间，变化率，变化率和可变性（在土地上和海上）的响应率仍然高于今天，却是deg的响应。研究人员将在与潜在的未来影响有关的一系列响应时间（从数十年到数千年中）中对多个相互作用变量的动态响应。具体的研究问题包括：1）Petermann Ice Branf对全新世内的气候变化的敏感程度如何？ 2）货架响应是否与接地的彼得曼冰川，海洋热条件或相对海平面（即缝隙深度）的变化无关或与之相关？ 3）这些系统的变化率和可变性是多少，以响应早期的全新世变暖，新冰分冷却和最近的变暖？该项目将支持几名年轻调查人员，并将为他们提供船舶和陆基培训经验。该项目包括重要的国际合作，并从非美国的资料来源提供了实物的大量贡献，这些资料为该项目增加了价值。计划的外展活动包括教师参与现场计划和有意义的课堂参与。