Losing its character The eastern Eurasian Basin of the Arctic Ocean is on the far side of the North Pole from the Atlantic, but it is becoming more like its larger neighbor as the climate warms. Polyakov et al. show that this region is also evolving toward a state of weakened stratification with increased vertical mixing, release of oceanic heat, and less sea ice. These changes could have considerable impacts on other geophysical and biogeochemical aspects of the Arctic Ocean system and presage a fundamentally new Arctic climate state. Science, this issue p. 285 The eastern Arctic Ocean is becoming more like the Atlantic as climate changes. 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.

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大西洋流入对北冰洋欧亚盆地海冰损失的更大作用

失去它的特征 北冰洋东部欧亚盆地位于北极远离大西洋的一侧，但随着气候变暖，它变得更像它更大的邻居。波利亚科夫等人。表明该地区也在朝着分层减弱的状态发展，垂直混合增加，海洋热量释放，海冰减少。这些变化可能对北冰洋系统的其他地球物理和生物地球化学方面产生相当大的影响，并预示着一个全新的北极气候状态。科学，这个问题 p。285 随着气候变化，北冰洋东部变得更像大西洋。北极海冰损失是气候变化的主要指标，在很大程度上可以归因于大气强迫。在这里，我们展示了最近的冰减少、盐层减弱、欧亚盆地东部中深大西洋水层的浅滩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增加减少了冬季海冰的形成，其速度现在可与大气热力学强迫造成的损失相媲美，从而解释了最近欧亚盆地东部海冰覆盖的减少。欧亚盆地的这种侵蚀“大西洋化”代表了朝着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。相关的海洋热量释放增加减少了冬季海冰的形成，其速度现在可与大气热力学强迫造成的损失相媲美，从而解释了最近欧亚盆地东部海冰覆盖的减少。欧亚盆地的这种侵蚀“大西洋化”代表了朝着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。相关的海洋热量释放增加减少了冬季海冰的形成，其速度现在可与大气热力学强迫造成的损失相媲美，从而解释了最近欧亚盆地东部海冰覆盖的减少。欧亚盆地的这种侵蚀“大西洋化”代表了朝着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。