Model Studies of Surface Water Behavior on Ice Shelves

冰架上地表水行为的模型研究

• 批准号: 0944248
• 负责人: Douglas MacAyeal
• 金额: $ 23.23万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-04-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0944248&HistoricalAwards=false
• 关键词: Model; Studies; Surface; Water; Behavior

MacAyeal/0944248This award supports a project to develop a better understanding of the processes and conditions that trigger ice shelf instability and explosive disintegration. A significant product of the proposed research will be the establishment of parameterizations of micro- and meso-scale ice-shelf surface processes needed in large scale ice-sheet models designed to predict future sea level rise. The proposed research represents a 3-year effort to conduct numerical model studies of 6 aspects of surface-water evolution on Antarctic ice shelves. These 6 model-study areas include energy balance models of melting ice-shelf surfaces, with treatment of surface ponds and water-filled crevasses, distributed, Darcian water flow modeling to simulate initial firn melting, brine infiltration, pond drainage and crevasse filling, ice-shelf surface topography evolution modeling by phase change (surface melting and freezing), surface-runoff driven erosion and seepage flows, mass loading and flexure effects of ice-shelf and iceberg surfaces; feedbacks between surface-water loads and flexure stresses; possible seiche phenomena of the surface water, ice and underlying ocean that constitute a mechanism for, inducing surface crevassing., surface pond and crevasse convection, and basal crevasse thermohaline convection (as a phenomena related to area 5 above). The broader impacts of the proposed work bears on the socio-environmental concerns of climate change and sea-level rise, and will contribute to the important goal of advising public policy. The project will form the basis of a dissertation project of a graduate student whose training will contribute to the scientific workforce of the nation and the PI and graduate student will additionally participate in a summer science-enrichment program for high-school teachers organized by colleagues at the University of Chicago.

MacAyeal/0944248该奖项支持一个项目，旨在更好地了解引发冰架不稳定和爆炸性崩解的过程和条件。拟议研究的一个重要成果将是建立旨在预测未来海平面上升的大规模冰盖模型所需的微观和中观冰架表面过程的参数化。 拟议的研究代表了为期三年的努力，对南极冰架表面水演化的六个方面进行数值模型研究。这 6 个模型研究领域包括融化冰架表面的能量平衡模型、地表池塘和充水裂缝的处理、分布式达西水流模型以模拟初始冰融化、盐水渗透、池塘排水和裂缝填充、冰- 通过相变（表面融化和冻结）、地表径流驱动的侵蚀和渗流、冰架和冰山表面的质量载荷和弯曲效应进行陆架表面地形演化建模；地表水荷载和弯曲应力之间的反馈；地表水、冰和底层海洋可能存在的seiche现象，构成诱发地表裂隙、地表池塘和裂隙对流以及基底裂隙温盐对流（作为与上述区域5相关的现象）的机制。 拟议工作的更广泛影响涉及气候变化和海平面上升的社会环境问题，并将有助于实现公共政策咨询的重要目标。该项目将构成研究生论文项目的基础，研究生的培训将为国家科学劳动力做出贡献，PI和研究生还将参加由同事组织的高中教师夏季科学强化项目。芝加哥大学。