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

穿透冰层的雷达揭示的冰川和冰盖的内部结构，改变了我们理解冰演化的能力。两名研究人员提议利用最近编制的格陵兰现有雷达数据汇编，结合冰流模型，增进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。这是第一次有可能在格陵兰冰盖的大部分地区开展这样的项目，以解决气候和冰盖随着时间的变化而发生的变化。拟议工作的主要目标包括：1)验证根据最近提供的格陵兰冰盖全冰盖放射性地层学得出的推断，对照沿流向收集的目标地面和空中数据绘制的内部反射图得出的推断；2)确定和适用利用格陵兰冰盖辐射地层学的战略；限制其历史并评估有关其演变的假设；3)确定与辐射地层学相匹配的格陵兰过去气候和冰流的重建；以及4)为今后大陆范围的冰流模拟奠定基础，这将寻求同化大范围的放射性地层学。更广泛的影响将包括支持两名职业生涯早期的调查人员，指导研究生和本科生，公众宣传，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.