Arctic warming hotspot in the northern Barents Sea linked to declining sea-ice import
Arctic warming hotspot in the northern Barents Sea linked to declining sea-ice import
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DOI：
10.1038/s41558-018-0205-y
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发表时间：
2018-07-01
影响因子：
30.7
通讯作者：
Furevik, Tore
中科院分区：
文献类型：
--
作者：
Lind, Sigrid;Ingvaldsen, Randi B.;Furevik, Tore
近几十年来，北极急剧变暖，在巴伦支海北部观测到的温度增幅最大。变暖的特征并不局限于大气，而是延伸到整个水柱。在这里，我们利用1970年至2016年的水文观测汇编，研究了海冰输入变化与北极变暖热点之间的联系。从2000年代中期开始，海洋温度和盐度明显急剧上升，我们认为这可能与最近海冰进口减少和相应的淡水损失有关，导致海洋分层减弱、垂直混合增强以及向上的热盐通量增加，从而阻止海冰形成并增加海洋热含量。因此，巴伦支海北部可能很快完成从寒冷和分层的北极到温暖和混合良好的大西洋主导的气候制度的转变。这种转变将对巴伦支海生态系统产生未知的后果，包括与冰有关的海洋哺乳动物和商业鱼类。
The Arctic has warmed dramatically in recent decades, with greatest temperature increases observed in the northern Barents Sea. The warming signatures are not constrained to the atmosphere, but extend throughout the water column. Here, using a compilation of hydrographic observations from 1970 to 2016, we investigate the link between changing sea-ice import and this Arctic warming hotspot. A sharp increase in ocean temperature and salinity is apparent from the mid-2000s, which we show can be linked to a recent decline in sea-ice import and a corresponding loss in freshwater, leading to weakened ocean stratification, enhanced vertical mixing and increased upward fluxes of heat and salt that prevent sea-ice formation and increase ocean heat content. Thus, the northern Barents Sea may soon complete the transition from a cold and stratified Arctic to a warm and well-mixed Atlantic-dominated climate regime. Such a shift would have unknown consequences for the Barents Sea ecosystem, including ice-associated marine mammals and commercial fish stocks.