Collaborative Research: GreenDrill: The response of the northern Greenland Ice Sheet to Arctic Warmth - Direct constrains from sub-ice bedrock

合作研究：GreenDrill：格陵兰岛北部冰盖对北极温暖的响应 - 来自冰下基岩的直接限制

• 批准号: 1933938
• 负责人: Jason Briner
• 金额: $ 54.47万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-10-01 至 2024-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1933938&HistoricalAwards=false
• 关键词: Collaborative; Research; GreenDrill; response; northern

The GreenDrill project is motivated by a need to understand past and future change in the extent of the Greenland Ice Sheet. The Greenland Ice Sheet (GrIS) holds about 24 feet (7.4 m) of sea level equivalent, yet it remains difficult to predict the rate of melt and possible tipping points in the stability of the ice sheet. In GreenDrill, the team of investigators will sample bedrock from under ice at sites in northern Greenland, analyzing cosmogenic nuclides to determine past periods of ice free conditions. These data will provide better understanding of how this region of the GrIS has responded to warm periods in the past. The team will also use these data in computer models to place results in the context of the entire ice sheet to explore mechanisms and climate forcing driving past periods of ice sheet disintegration, which in turn will inform projections of future ice sheet behavior and sea level rise. In addition to the high relevance of this research to society, the GreenDrill project includes broader impacts such as development of a new television episode called Adventures in Science, educational programs for middle and high school students via the Scientists are Superheroes program, and training for early career postdoctoral scientists, graduate students, and undergraduates.In this project, the investigators propose to gather new data to test the sensitivity of the northern Greenland Ice Sheet (GrIS) and its potential to contribute to sea level rise in the future. Specifically, data from the GreenDrill project will better constrain the response of the GrIS to past periods of warmth and address the hypothesis that the northern GrIS is more sensitive to Arctic warming than the southern GrIS. The team will drill through the ice at sites in northern Greenland, sample bedrock obtained from those cores, and analyze a suite of cosmogenic nuclides (Beryllium-10, Aluminum-26, Chlorine-36, Carbon-14, and Neon-21) that can act as signatures of changes to the GrIS margin. These data will deliver direct observations of periods when the GrIS was substantially smaller than today and ice sheet margins retreated inland. Results will be incorporated into a numerical ice sheet model with a built-in cosmogenic nuclide module to identify plausible ice sheet histories. The modeling experiments will help understand the mechanisms and climate forcing underlying past periods of ice sheet retreat and help inform predictions of the future. Based on the melting scenarios, a first-order map of sea level rise fingerprints and inundation scenarios for major port cities will be produced.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.

Greendrill项目的激励是要了解格陵兰冰盖范围的过去和将来变化。格陵兰冰盖（GRIS）拥有约24英尺（7.4 m）的海平面等效物，但是很难预测冰盖稳定性的熔体速率和可能的临界点。在格林德里尔（Greendrill），调查人员团队将从格陵兰北部北部的冰层中采样基岩，分析宇宙核素以确定过去无冰条件的时期。这些数据将更好地了解Gris的这个地区过去对温暖时期的反应。该团队还将在计算机模型中使用这些数据将结果置于整个冰盖的背景下，以探索机制和气候迫使驱动过去的冰盖瓦解时期，这又将为未来的冰盖行为和海平面上升提供预测。除了这项研究与社会的高度相关性外，Greendrill项目还包括更广泛的影响，例如开发一个名为“科学冒险”的新电视节目，通过科学家为中学生提供的教育计划，以及对早期职业生涯的早期职业上的博士后科学家，研究生培训，研究员和研究人员的培训，以便在研究人员中培训新的冰计划。潜力有助于未来的海平面上升。具体而言，Greendrill项目的数据将更好地限制Gris对过去温暖时期的反应，并解决了以下假设：北部Gris对北极变暖比南部的Gris更敏感。该团队将在北格林兰北部的冰中钻探冰层，从这些核心获得的样品基岩，并分析一套宇宙核素（Beryllium-10，Aluminum-26，Aluminum-26，Choriline-36，Carbon-14和Neon-21），可以用作对Gris利率变化的标志。这些数据将直接观察GRIS比今天小得多的时期，并且冰盖边缘撤退了内陆。结果将纳入具有内置宇宙核素模块的数值冰盖模型，以识别合理的冰盖历史。建模实验将有助于了解冰盖静修过去的基本时期的机制和气候，并有助于为未来提供预测。基于熔化方案，将生产出主要港口城市的海平面上升指纹和淹没方案的一阶地图。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的评估标准来评估的。