The Amundsen Continental Shelf and the Antarctic Ice Sheet

阿蒙森大陆架和南极冰盖

• 批准号: 0440775
• 负责人: Stanley Jacobs
• 金额: --
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440775&HistoricalAwards=false
• 关键词: Amundsen; Continental; Shelf; Antarctic; Ice

This collaborative study between Columbia University and the Southampton Oceanography Centre will investigate the dynamics of warm water intrusions under antarctic floating ice shelves. The study will focus on the Amundsen Sea and Pine Island Glacier, and will document how this water gains access to the continental shelf, transports heat into the ice shelf cavities via deep, glacially-scoured troughs, and rises beneath the ice to drive basal melting. The resulting seawater-meltwater mixtures upwell near the ice fronts, contributing to the formation of atypical coastal polynyas with strong geochemical signatures. Multidecadal freshening downstream is consistent with thinning ice shelves, which may be triggering changes inland, increasing the flow of grounded ice into the sea. This work will be carried out in combination with parallel modeling, remote sensing and data based projects, in an effort to narrow uncertainties about the response of West Antarctic Ice Sheet to climate change. Using state-of-the-art facilities and instruments, this work will enhance knowledge of water mass production and modification, and the understanding of interactions between the ocean circulation, sea floor and ice shelves. The data and findings will be reported to publicly accessible archives and submitted for publication in the scientific literature. The information obtained should prove invaluable for the development and validation of general circulation models, needed to predict the future role of the Antarctic Ice Sheet in sea level change.

哥伦比亚大学和南安普顿海洋学中心的这项合作研究将调查南极浮冰架下温水入侵的动力学。 这项研究将侧重于阿蒙森海和松岛冰川，并将记录这些水如何进入大陆架，通过深的冰川冲刷槽将热量输送到冰架空腔，并在冰下上升以推动基底融化。由此产生的海水-融水混合物在冰锋附近上升，有助于形成具有强烈地球化学特征的非典型沿海冰穴。下游数十年的淡水化与冰架变薄是一致的，这可能会引发内陆的变化，增加流入海洋的地面冰。这项工作将结合并行建模、遥感和基于数据的项目进行，以努力缩小南极西部冰盖对气候变化反应的不确定性。 这项工作将利用最先进的设施和仪器，增进关于水的大量产生和改变的知识，并增进对海洋环流、海底和冰架之间相互作用的了解。 这些数据和发现将报告给公众查阅的档案馆，并提交科学文献发表。所获得的信息对于发展和验证预测南极冰盖在海平面变化中的未来作用所需的大气环流模型应该是非常宝贵的。