Warm surface waters increase Antarctic ice shelf melt and delay dense water formation
Warm surface waters increase Antarctic ice shelf melt and delay dense water formation
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DOI：
10.1038/s43247-022-00456-z
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发表时间：
2022-06
影响因子：
7.9
通讯作者：
S. Aoki;Tomoki Takahashi;Kaihe Yamazaki;D. Hirano;Kazuya Ono;K. Kusahara;T. Tamura;Guy D. Williams-Guy
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文献类型：
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作者：
S. Aoki;Tomoki Takahashi;Kaihe Yamazaki;D. Hirano;Kazuya Ono;K. Kusahara;T. Tamura;Guy D. Williams-Guy
南极洲周围融化的冰架控制着大量淡水进入海洋，并在全球热量重新分配中发挥着复杂的作用。埃默里冰架调节冬季海冰的生长和密集的冰架水的形成。我们研究了温暖的南极地表水在冰架融化中的作用及其对密集陆架水的影响。在这里，我们表明，2016/17年夏季的沿海海洋几乎没有海冰，导致表面水温较高。冰川融水在地表水中的比例是有记录以来最高的，假设是由于异常的冰架融化。2017年初过多的热量和淡水推迟了密集陆架水的季节性演变。人们把注意力集中在深层冰架融化上，却忽视了变暖的表层沃茨的重要性和影响。在气候变暖的情况下，地表水加热的增加将减少沿海海冰的产生，并可能减少南极底层水的形成。
Melting ice shelves around Antarctica control the massive input of freshwater into the ocean and play an intricate role in global heat redistribution. The Amery Ice Shelf regulates wintertime sea-ice growth and dense shelf water formation. We investigated the role of warm Antarctic Surface Water in ice shelf melting and its impact on dense shelf water. Here we show that the coastal ocean in summer 2016/17 was almost sea-ice free, leading to higher surface water temperatures. The glacial meltwater fraction in surface water was the highest on record, hypothesised to be attributable to anomalous ice shelf melting. The excess heat and freshwater in early 2017 delayed the seasonal evolution of dense shelf water. Focused on ice shelf melting at depth, the importance and impacts of warming surface waters has been overlooked. In a warming climate, increased surface water heating will reduce coastal sea-ice production and potentially Antarctic Bottom Water formation.