East Antarctic Grounding Line Experiment (EAGLE)

南极东部接地线实验（EAGLE）

• 批准号: 1543452
• 负责人: Donald Blankenship
• 金额: $ 72.45万
• 依托单位: University of Texas at Austin
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-08-01 至 2019-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1543452&HistoricalAwards=false
• 关键词: East; Antarctic; Grounding; Line; Experiment

Previous studies of the Indo-Pacific region of Antarctica show that the margin of the ice sheet in this region has advanced and retreated into deep interior basins many times in the past. The apparent instability of this region makes it an important target for study in terms of understanding the future of the East Antarctic ice sheet and sea level rise. This project will study a number of processes that control the ice-shelf stability of this region, with the aim of improving projections of the rate and magnitude of future sea-level rise. This project will engage a range of students and train this next generation of scientists in the complex, interdisciplinary issue of ice-ocean interaction.The project will integrate geophysical data collected from aircraft over three criticalsections of the East Antarctic grounding line (Totten Glacier, Denman Glacier, andCook Ice Shelf) with an advanced ocean model. Using Australian and French assets,the team will collect new data around Denman Glacier and Cook Ice Shelf whereas analysis of Totten Glacier will be based on existing data. The project will assess three hypotheses to isolate the processes that drive the differences in observed grounding line thinning among these three glaciers: 1. bathymetry and large-scale ocean forcing control cavity circulation; 2. ice-shelf draft and basal morphology control cavity circulation; 3. subglacial freshwater input across the grounding line controls cavity circulation. The key outcomes of this new project will be to: 1. evaluate of ice-ocean coupling in areas of significant potential sea-level contribution; 2. relate volume changes of grounded and floating ice to regional oceanic heat transport and sub-ice shelf ocean dynamics in areas of significant potential sea-level and meridional overturning circulation impacts; and 3. improve boundary conditions to evaluate mass, heat, and freshwater budgets of East Antarctica's continental margins.

以前对南极洲印太地区的研究表明，该地区冰盖的边缘在过去曾多次前进和后退到深处的内陆盆地。 这一区域明显的不稳定性使其成为了解南极东部冰盖未来和海平面上升的重要研究目标。 该项目将研究控制该区域冰架稳定性的若干过程，目的是改进对未来海平面上升速度和幅度的预测。 该项目将使一系列学生参与进来，并就冰与海洋相互作用这一复杂的跨学科问题对下一代科学家进行培训，该项目将把从飞机上收集的东南极接地线三个关键部分（托滕冰川、登曼冰川和库克冰架）的地球物理数据与先进的海洋模型相结合。利用澳大利亚和法国的资产，该小组将收集登曼冰川和库克冰架周围的新数据，而对托滕冰川的分析将基于现有数据。 该项目将评估三个假设，以隔离导致这三个冰川之间观测到的接地线变薄差异的过程：1。水深测量和大尺度海洋强迫控制空洞环流; 2.冰架吃水和底部地形控制空洞环流; 3.冰下淡水输入跨越接地线控制腔循环。 这个新项目的主要成果将是：1。在对海平面有重大潜在贡献的地区评估冰-海耦合; 2.在潜在的海平面和赤道翻转环流影响显著的地区，将固定冰和浮冰的体积变化与区域海洋热输送和冰下陆架海洋动力学联系起来; 3.改进边界条件以评估南极洲东部大陆边缘质量、热量和淡水收支。

项目成果

Antarctic Bedmap data: Findable, Accessible, Interoperable, and Reusable (FAIR) sharing of 60 years of ice bed, surface, and thickness data

• DOI: 10.5194/essd-15-2695-2023
• 发表时间: 2023-07-17
• 期刊: EARTH SYSTEM SCIENCE DATA
• 影响因子: 11.4
• 作者: Fremand, Alice C.;Fretwell, Peter;Zirizzotti, Achille
• 通讯作者: Zirizzotti, Achille