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 - 海洋边界处的冰川相互作用如何导致冰山产犊和融化的有限理解有助于海平面上升预测的不确定性。茂密的冰山和海冰，被称为冰泥，发生在许多格陵兰峡湾中，将来可能发生在许多南极冰川附近。观察结果表明，冰混合可能直接通过压在冰川前部，并间接影响冰川产犊，并通过控制冰山融化的何时何时融化冰川融化，从而影响海洋循环和海洋热量向冰川。但是，由于在格陵兰峡湾进行现场工作的困难，尚未系统地研究冰混合，海洋循环和冰山产犊之间的相互作用。冰川群项目将使用实验室实验和模型研究冰川，冰混合和海洋之间的复杂相互作用，以提供这些系统共同发展的第一个综合模型。冰川项目将使用详细的过程模型和实验室实验来研究冰泥和Fjord和Fjord和Fjord Waters之间的热力学和机械耦合。将使用颗粒物理学的最新连续方法开发出独立的，冰混合颗粒流的数值模型。该独立模型将用于测试冰混合流动和对外部强迫的压力的敏感性。实验和仿真的结果将用于开发完全耦合的冰川 - 外山模型模型（冰川），该模型包括新的独立Mélange模型，冰片和海平面系统模型（ISSM）和MITGCM海洋模型。耦合冰川模型将用于测试冰混合在衰老时间尺度上对冰川稳定性的影响。除了科学进展外，冰川群项目还将为职业发展和外展提供机会。该项目将支持两个早期的职业生涯，两名研究生和一名博士后研究员。学生和博士后将接受跨学科培训，这对于解决具有重大社会影响的科学问题，例如气候变化和海平面上升至关重要。 PI将通过讲座和组织亚特兰大科学节的活动向公众传达结果。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响评估标准，通过评估来诚实地获得支持。