Greater role for Atlantic inflows on sea-ice loss in the Eurasian Basin of the Arctic Ocean
Greater role for Atlantic inflows on sea-ice loss in the Eurasian Basin of the Arctic Ocean
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DOI：
10.1126/science.aai8204
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发表时间：
2017-04-21
期刊：
影响因子：
56.9
通讯作者：
Yulin, Alexander
中科院分区：
文献类型：
--
作者：
Polyakov, Igor V.;Pnyushkov, Andrey V.;Yulin, Alexander
北冰洋海冰的减少是气候变化的先行指标，在很大程度上可以归因于大气强迫。在这里，我们表明，最近的冰减少，盐跃层的减弱，以及欧亚盆地东部中深度大西洋水层的浅化，增加了海洋内部的冬季通风，使该地区在结构上与欧亚盆地西部相似。相关的海洋热量释放的增强减少了冬季海冰的形成，其速度现在可与大气热力学强迫的损失相媲美，从而解释了最近欧亚盆地东部海冰覆盖面积减少的原因。这种侵蚀欧亚盆地的“亚特兰蒂化”代表着朝着一个新的北极气候状态迈出的重要一步，大西洋流入将发挥更大的作用。
Arctic sea-ice loss is a leading indicator of climate change and can be attributed, in large part, to atmospheric forcing. Here, we show that recent ice reductions, weakening of the halocline, and shoaling of the intermediate-depth Atlantic Water layer in the eastern Eurasian Basin have increased winter ventilation in the ocean interior, making this region structurally similar to that of the western Eurasian Basin. The associated enhanced release of oceanic heat has reduced winter sea-ice formation at a rate now comparable to losses from atmospheric thermodynamic forcing, thus explaining the recent reduction in sea-ice cover in the eastern Eurasian Basin. This encroaching "atlantification" of the Eurasian Basin represents an essential step toward a new Arctic climate state, with a substantially greater role for Atlantic inflows.