Collaborative Research: GLACIOME: Developing a comprehensive model of the glacier-ocean-melange system

合作研究：GLACIOME：开发冰川-海洋-混合系统的综合模型

• 批准号: 2025764
• 负责人: Jason Amundson
• 金额: $ 9.72万
• 依托单位: University of Alaska Southeast Juneau Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2025764&HistoricalAwards=false
• 关键词: Collaborative; Research; GLACIOME; Developing; comprehensive

A limited understanding of how glacier-ocean interactions lead to iceberg calving and melting at the ice-ocean boundary contributes to uncertainty in predictions of sea level rise. Dense packs of icebergs and sea ice, known as ice mélange, occur in many Greenland fjords, and may occur near many Antarctic glaciers in the future. Observations suggest that ice mélange may directly affect iceberg calving by pressing against the glacier front and indirectly affect glacier melting by controlling where and when icebergs melt which can impact ocean circulation and ocean heat transport towards glaciers. However, the interactions between ice mélange, ocean circulation, and iceberg calving have not been systematically investigated due to the difficulty of conducting field work in Greenland fjords. The GLACIOME project will investigate the complex interactions between glaciers, ice mélange and the ocean using laboratory experiments and models to provide the first comprehensive model of the co-evolution of these systems.The GLACIOME project will use detailed process models and laboratory experiments to investigate thermodynamic and mechanical couplings between ice mélange and fjord waters. A stand-alone, numerical model of ice mélange granular flow will be developed using state-of-the-art continuum approaches from granular physics. This standalone model will be used to test the sensitivity of ice mélange flow and stress to external forcings. Results from experiments and simulations will be used in the development of a fully coupled glacier-ocean-mélange model (GLACIOME), which includes the new standalone mélange model, the Ice-Sheet and Sea-Level System Model (ISSM) and the MITgcm ocean model. The coupled GLACIOME model will be used to test the impact of ice mélange on glacier stability over decadal time scales. In addition to the scientific advances, the GLACIOME project will provide opportunities for career development and outreach. The project will support two early career PIs, two graduate students, and one postdoctoral fellow. The students and postdoc will receive interdisciplinary training that is essential for addressing scientific issues with major societal impacts, such as climate change and sea level rise. The PIs will communicate results to the public through lectures and organizing events for the Atlanta Science Festival.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.

对冰川与海洋相互作用如何导致冰山崩解和融化的了解有限，这导致了海平面上升预测的不确定性。许多格陵兰峡湾出现了密集的冰山和海冰（称为混合冰）。未来可能会发生在许多南极冰川附近。观测表明，混冰可能会通过挤压冰川前沿来直接影响冰山崩解，并间接影响冰山崩解。通过控制冰山融化的地点和时间来控制冰川融化，这可能会影响海洋环流和海洋向冰川的热量传输。然而，由于在格陵兰岛进行实地工作的困难，冰混合物、海洋环流和冰山崩解之间的相互作用尚未得到系统的研究。 GLACIOME 项目将利用实验室实验和模型研究冰川、混冰和海洋之间的复杂相互作用，以提供这些系统共同进化的第一个综合模型。 GLACIOME 项目将使用详细的过程模型和实验室实验来研究混冰和峡湾水域之间的热力学和机械耦合，并将使用最先进的颗粒连续介质方法开发独立的混冰颗粒流数值模型。该独立模型将用于测试冰混合物流动和应力对外部强迫的敏感性，实验和模拟的结果将用于开发完全耦合的模型。冰川海洋混合模型（GLACIOME），包括新的独立混合模型、冰盖和海平面系统模型（ISSM）以及MITgcm海洋模型，耦合的GLACIOME模型将用于测试冰的影响。除了科学进步之外，GLACIOME 项目还将提供职业发展和推广的机会 该项目将支持两个早期项目。职业 PI、两名研究生和一名博士后将接受跨学科培训，这对于解决气候变化和海平面上升等具有重大社会影响的科学问题至关重要。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。