Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier
Antarctic Slope Current Modulates Ocean Heat Intrusions Towards Totten Glacier
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DOI：
10.1029/2021gl094149
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发表时间：
2021-08
影响因子：
5.2
通讯作者：
Y. Nakayama;C. Greene;F. Paolo;Vigan Mensah;Hong Zhang;Haruhiko Kashiwase;D. Simizu;J. Greenbaum;D. Blankenship;A. Abe‐Ouchi;S. Aoki
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作者：
Y. Nakayama;C. Greene;F. Paolo;Vigan Mensah;Hong Zhang;Haruhiko Kashiwase;D. Simizu;J. Greenbaum;D. Blankenship;A. Abe‐Ouchi;S. Aoki
近年来，东南极洲的托滕冰架（TIS）由于基础融化率较高而受到越来越多的关注，这与冰锋处观察到的温暖的改良环极深水（mCDW）的存在有关。我们发现，当南极坡流（ASC）减弱时，mCDW 对 TIS 的陆架入侵会加强。这表明 ASC 具有阻断效应，并且 ASC 减弱会导致货架入侵，正如之前的观察研究所提出的那样。 ASC 的年际变化主要受我们区域模型域之外的大气和海洋条件的控制。我们进一步表明，对TIS外大陆架的热侵入不受外陆变暖的影响，而是随着海岸清新而增强，这表明冰融化和上游清新可以启动连锁反应，导致融化增加和进一步的海岸清新的正反馈。
The Totten ice shelf (TIS) in East Antarctica has received increasing attention in recent years due to high basal melt rates, which have been linked to a presence of warm modified Circumpolar Deep Water (mCDW) observed at the ice front. We show that mCDW on‐shelf intrusions towards the TIS strengthen when the Antarctic Slope Current (ASC) weakens. This demonstrates that the ASC has a blocking effect and ASC weakening leads to on‐shelf intrusions, as proposed by previous observational studies. The interannual variability of the ASC is controlled primarily by atmospheric and oceanic conditions beyond our regional model domain. We further show that heat intrusions onto the continental shelf off the TIS are not influenced by off‐shelf warming but are enhanced with coastal freshening, suggesting positive feedback whereby ice melt and freshening upstream could start a chain reaction, leading to increased melt, and further coastal freshening.