Genesis of the Antarctic Slope Current in West Antarctica
Genesis of the Antarctic Slope Current in West Antarctica
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DOI：
10.1029/2020gl087802
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发表时间：
2020-08
影响因子：
5.2
通讯作者：
A. Thompson;K. Speer;L. S. Schulze Chretien
中科院分区：
文献类型：
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作者：
A. Thompson;K. Speer;L. S. Schulze Chretien
西南极冰盖（WAIS）的稳定性取决于海洋热量向其底部的输送，并且仍然是海平面上升预测的不确定性来源。南极斜坡流（ASC）是海洋全球环流的一个主要边界流，是向南极洲输送热量的动态门户。在这里，我们使用从别林斯高晋海收集到的观测数据，提出了一个向西流动的ASC开始的机制解释。整个别林斯高晋海因海洋-海冰和海洋-冰架相互作用而改变的沃茨以狭窄的、地形转向的西边界流的形式输出到大陆坡。这种集中的外流在陆架坡折处产生了一个局部锋，支持了新兴的ASC。这种机制强调了浮力强迫的重要性，集成在大陆架上，而不是当地的风强迫，在生成机制，并建议远程控制WAIS的最大的冰架融化率的潜力。
The stability of the West Antarctic Ice Sheet (WAIS) depends on ocean heat transport toward its base and remains a source of uncertainty in sea level rise prediction. The Antarctic Slope Current (ASC), a major boundary current of the ocean's global circulation, serves as a dynamic gateway for heat transport toward Antarctica. Here, we use observations collected from the Bellingshausen Sea to propose a mechanistic explanation for the initiation of the westward‐flowing ASC. Waters modified throughout the Bellingshausen Sea by ocean‐sea‐ice and ocean‐ice‐shelf interactions are exported to the continental slope in a narrow, topographically steered western boundary current. This focused outflow produces a localized front at the shelf break that supports the emerging ASC. This mechanism emphasizes the importance of buoyancy forcing, integrated over the continental shelf, as opposed to local wind forcing, in the generation mechanism and suggests the potential for remote control of melt rates of WAIS' largest ice shelves.