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

冰层穿透雷达揭示的冰川和冰原的内部结构，改变了我们理解冰层演变的能力。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)验证最近获得的格陵兰冰盖全冰盖放射地层学的推断，与沿着流线收集的目标地面和机载数据绘制的内部反射图的推断相比较；2)确定和应用格陵兰冰盖放射地层学策略；限制它的历史，并评估关于它的演变的假设；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；4)为未来大陆尺度的冰流模型提供基础，该模型将寻求吸收广泛的放射地层学。更广泛的影响将包括支持两名早期职业研究者，指导研究生和本科生，公共宣传以及将研究纳入正式课程。

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.