RII Track 4: Expanding Research Capacity across Arctic Systems: Expertise Development in Coupled Ice Sheet - Groundwater Processes

RII 轨道 4：扩大北极系统的研究能力：耦合冰盖 - 地下水过程的专业知识开发

• 批准号: 1929068
• 负责人: Toby Meierbachtol
• 金额: $ 16.47万
• 依托单位: University of Montana
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-02-01 至 2023-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1929068&HistoricalAwards=false
• 关键词: RII; Track; Expanding; Research; Capacity

Ice sheets are tightly connected to the underlying earth upon which they rest. Where liquid water resides at the bottom of an ice sheet, it can exchange with the groundwater system. Whether the bottom of an ice sheet is frozen or melted is therefore an important control on the connection between ice and groundwater but depends on the complex ways in which water and heat pass between ice and earth systems. In this project the PI, with expertise in glacier science, will work closely with groundwater experts at New Mexico Institute of Mining and Technology, sharing discipline-specific knowledge to overcome challenges to understanding connections between ice sheets and groundwater systems. The PI will carry out computer modeling that connects both ice sheet and groundwater systems to determine how groundwater flow influences where the bottom of the ice sheet is frozen or melted. Where a glacier or ice sheet is frozen or melted at its base controls where it can slide, and also determines where water can recharge the groundwater system. Outcomes from the project are therefore relevant to both ice sheet dynamics and groundwater flow in cold regions. The project will increase research capacity and student opportunities at University of Montana, and guest lectures to Montana high schools will benefit the local jurisdiction.Water cycling in the Arctic is distinctly unique from the global hydrologic cycle due to the presence of large ice masses that source and generally drive groundwater to adjacent terrestrial and ocean systems. Linking coupling processes between ice sheet and groundwater systems, however, requires merging the knowledgebase and skillsets of a spectrum of scientific sub-disciplines. The objective of this project is to overcome discipline-specific barriers by enabling close collaboration, sharing of expertise, and educational exchange between experts in ice sheet processes and groundwater systems. Project research is focused on mass and energy feedbacks on the inland extent of melted conditions at the bottom of an ice sheet: a key problem that is highly relevant to both glaciology and hydrogeology disciplines. The problem will be addressed through novel modeling of coupled ice sheet and groundwater systems: the PI will be an early adopter of modeling packages developed by host collaborators, and generate new thermal coupling between systems. Outcomes of the project will advance understanding of heat and water fluxes across ice sheet and groundwater systems: two critical components of the Arctic that impact sea level rise, groundwater resources at the global scale, and submarine fluxes of fresh groundwater. Activities will generate new learning opportunities for students at the University of Montana, increase the institution’s research capacity, and yield jurisdictional benefits through outreach lectures to Montana high schools.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.

冰盖与它们所处的底层土地紧密相连。当液态水存在于冰盖底部时，它可以与地下水系统交换。因此，冰盖底部是冻结还是融化是冰和地下水之间联系的重要控制因素，但这取决于水和热在冰和地球系统之间传递的复杂方式。在这个项目中，具有冰川科学专业知识的PI将与新墨西哥州采矿和技术研究所的地下水专家密切合作，分享特定学科的知识，以克服理解冰盖和地下水系统之间联系的挑战。PI将进行连接冰盖和地下水系统的计算机建模，以确定地下水流如何影响冰盖底部冻结或融化的地方。冰川或冰盖在其底部冻结或融化的位置控制着它可以滑动的位置，也决定了水可以补充地下水系统的位置。因此，该项目的成果与寒冷地区的冰盖动力学和地下水流有关。该项目将增加蒙大拿大学的研究能力和学生的机会，并为蒙大拿州高中提供客座讲座，这将使当地司法管辖区受益。北极的水循环在全球水文循环中是独特的，因为存在大量的冰块，这些冰块通常会将地下水带到邻近的陆地和海洋系统。然而，要将冰盖和地下水系统之间的耦合过程联系起来，就需要融合一系列科学分支学科的知识基础和技能。该项目的目标是通过促进冰盖过程和地下水系统专家之间的密切合作、分享专门知识和教育交流，克服特定学科的障碍。项目研究的重点是冰盖底部融化条件的内陆范围的质量和能量反馈：这是一个与冰川学和水文地质学学科高度相关的关键问题。这个问题将通过耦合冰盖和地下水系统的新建模来解决：PI将是主机合作者开发的建模包的早期采用者，并在系统之间产生新的热耦合。该项目的成果将促进对冰盖和地下水系统的热量和水通量的理解：北极影响海平面上升的两个关键组成部分，全球范围的地下水资源，以及淡水地下水的海底通量。这些活动将为蒙大拿大学的学生创造新的学习机会，提高该机构的研究能力，并通过对蒙大拿州高中的推广讲座产生管辖权利益。该奖项反映了NSF的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Millennial-scale migration of the frozen/melted basal boundary, western Greenland ice sheet

格陵兰岛西部冰盖冻结/融化的基底边界的千年规模迁移

• DOI: 10.1017/jog.2021.134
• 发表时间: 2022
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: Stansberry, Aidan;Harper, Joel;Johnson, Jesse V.;Meierbachtol, Toby
• 通讯作者: Meierbachtol, Toby

Rapid and sensitive response of Greenland’s groundwater system to ice sheet change

• DOI: 10.1038/s41561-021-00813-1
• 发表时间: 2021-09
• 期刊: Nature Geoscience
• 影响因子: 18.3
• 作者: L. Liljedahl;T. Meierbachtol;J. Harper;D. van As;J. Näslund;J. Selroos;J. Saito;S. Follin;T. Ruskeeniemi;A. Kontula;N. Humphrey

Multi-decadal elevation changes of the land terminating sector of West Greenland

西格陵兰陆地终止区的数十年高程变化

• DOI: 10.1017/jog.2022.47
• 发表时间: 2023
• 期刊: Journal of Glaciology
• 影响因子: 3.4
• 作者: Saito, Jun;Meierbachtol, Toby;Harper, Joel
• 通讯作者: Harper, Joel