Unraveling the history of the Greenland Ice Sheet from its internal radiostratigraphy

从内部放射地层学揭示格陵兰冰盖的历史

• 批准号: 1503907
• 负责人: Michelle Koutnik
• 金额: $ 28.41万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1503907&HistoricalAwards=false
• 关键词: Unraveling; history; Greenland; Ice; Sheet

The internal structure of glaciers and ice sheets, revealed by ice-penetrating radars, has transformed our ability to understand ice evolution. Two investigators propose to use a recently developed compilation of available radar data from Greenland, in combination with ice-flow models, to increase understanding of the history of the Greenland Ice Sheet that will provide context for its response to current and future changes. This is the first time such a project is possible across most of the Greenland Ice Sheet to address how the climate and the ice sheet have changed over time. The major objectives of the proposed work include: 1) validating inferences from the recently available ice-sheet-wide dated radiostratigraphy of the Greenland Ice Sheet against those from internal reflections mapped by targeted ground-based and airborne data collected along flowlines; 2) defining and applying strategies to use Greenland Ice Sheet radiostratigraphy; to constrain its history and to evaluate hypotheses regarding its evolution; 3) determining reconstructions of Greenland's past climate and ice flow that match the radiostratigraphy; and 4) providing a foundation for future continental-scale ice-flow modeling that will seek to assimilate an extensive radiostratigraphy. Broader impacts will include support of two early-career investigators, mentoring graduate and undergraduate students, public outreach, and incorporation of the research into formal classes.

冰川和冰盖的内部结构，由冰穿透雷达揭示，已经改变了我们理解冰演化的能力。两名研究人员建议使用最近开发的格陵兰岛可用雷达数据汇编，结合冰流模型，以增加对格陵兰冰盖历史的了解，这将为其对当前和未来变化的反应提供背景。这是第一次在格陵兰冰盖的大部分地区进行这样的项目，以解决气候和冰盖如何随着时间的推移而变化。拟议工作的主要目标包括：1）根据最近可用的格陵兰冰盖全冰盖放射性地层学的推断，与沿着流线收集的有针对性的地面和空中数据绘制的内部反射的推断进行验证; 2）确定和应用使用格陵兰冰盖放射性地层学的战略;限制其历史并评估有关其演变的假设; 3）确定与放射性地层学相匹配的格陵兰岛过去气候和冰流的重建;以及4）为未来的大陆尺度冰流建模提供基础，该模型将寻求吸收广泛的放射性地层学。更广泛的影响将包括支持两个早期职业调查，指导研究生和本科生，公共宣传，并将研究纳入正式课程。