Postdoctoral Fellowship: OPP-PRF: Spatiotemporal Evolution of Firn Hydrology on the Juneau Icefield, Alaska

博士后奖学金：OPP-PRF：阿拉斯加朱诺冰原冰水文的时空演化

• 批准号: 2318348
• 负责人: Annika Horlings
• 金额: $ 34.68万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-10-01 至 2025-09-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2318348&HistoricalAwards=false
• 关键词: Postdoctoral; Fellowship; OPP; PRF; Spatiotemporal

The alpine glaciers of Alaska constitute some of the most rapidly changing parts of the Earth’s cryosphere and collectively contribute 25% of land-ice loss to global sea level. Understanding the physical processes involved in meltwater flow through a glacier remains a key challenge in predicting a glacier’s behavior and environmental impact. Specifically, the firn (the material through which freshly fallen snow compacts into glacial ice) influences the speed, volume, and geochemical composition of meltwater flow through a glacier. Water flow through the firn is, on a broad level, fundamental for characterizing glacier behavior, glacier mass loss and gain, and ultimately sea level, downstream ecology, and regional water resources. This research uses modeling and a variety of new and historical field data from the Juneau Icefield in Southeast Alaska to advance understanding of meltwater flow through the firn on Alaskan glaciers within the context of climate change. This project advances inclusive research practices by strengthening connections between the Juneau Icefield Research Program (JIRP) and Alaska Indigenous communities. This project: (1) measures changes in surface melt and firn properties that are key to understanding changes in firn hydrology on the Juneau Icefield, and (2) builds on novel applications of water-isotope stratigraphy to determine changes in timing and variability of meltwater infiltration in the firn. Accomplishing these objectives requires the assembly of ice-penetrating radar data, water-isotope records, meteorological data, and other in-situ measurements. This comprehensive dataset will facilitate analyses of field measurements and execution of meltwater-isotope model simulations to quantify surface-melt rates, melt timing, melt-infiltration rates, firn temperature, and englacial hydrological features such as firn-aquifer and ice-layer formation and evolution over sub-seasonal and inter-annual time periods. The comprehensive assessment of firn hydrology generated by this project will advance understanding of glacier change in Alaska and with broader implications for improved understanding of the Greenland and Antarctic ice sheets.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.

阿拉斯加的高山冰川构成了地球冰圈中一些最快变化的部分，共同贡献了土地钢铁损失的25％。了解通过冰川流动的物理过程仍然是预测冰川行为和环境影响的关键挑战。具体而言，第一种（刚落下雪成冰川冰冰块的材料）会影响融合流通过冰川流动的速度，体积和地球化学成分。在广泛的水平上，流经FIR的水流是表征冰川行为，冰川质量损失和增益，以及最终的海平面，下游生态和区域水资源的基础。这项研究使用了来自阿拉斯加东南部朱诺冰菲尔德的建模和各种新的和历史的数据，以促进在气候变化的背景下对阿拉斯加冰川上的FIR流过的融合水流的了解。该项目通过加强朱诺Icefield研究计划（JIRP）和阿拉斯加土著社区之间的联系来推进包容性研究实践。该项目：（1）测量表面熔体和FIR性能的变化，这是理解朱诺冰菲尔德（Juneau Icefield）的FIR水文学变化的关键，并且（2）建立在水 - 同位素层学的新应用基础上，以确定FIRN中融合水的时间和变化的变化和变化。实现这些目标需要组装冰根化辐射数据，水 - 异位记录，气象数据和其他原位测量值。这个全面的数据集将有助于分析现场测量和执行融化的异位模型模拟模拟，以量化表面熔融速率，熔体时机，融化浸润速率，FIRN温度以及诸如FIRN-Aquifer和Ice-layer形成和冰期和进化的时间范围内的时间和互联性时期的时间。该项目对公司产生的企业学的全面评估将提高人们对阿拉斯加冰川变化的了解，并具有更广泛的意义，以改善对格陵兰和南极冰盖的了解。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响审查标准来通过评估来获得的支持。