Atmospheric Blocking and Atlantic Multidecadal Ocean Variability
Atmospheric Blocking and Atlantic Multidecadal Ocean Variability
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DOI：
10.1126/science.1205683
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发表时间：
2011-11-04
期刊：
影响因子：
56.9
通讯作者：
Worthen, Denise L.
中科院分区：
文献类型：
--
作者：
Haekkinen, Sirpa;Rhines, Peter B.;Worthen, Denise L.
北大西洋北部的大气阻塞使大片空气与西风环流隔绝5天或更长时间，通过影响风型，从根本上影响海洋环流和上层海洋特性。冬季在格陵兰岛和西欧之间更频繁的阻塞与一个更温暖，更含盐的亚极地海洋相对应。阻挡的西风和温暖的海洋之间的对应关系在最近的十年事件中成立（特别是1996年至2010年）。它还描述了更长时间尺度的大西洋多年海洋变化（AMV），包括20世纪30年代至60年代温室气体排放前的极端北方变暖。与阻塞状态相关的风强迫时空结构导致海洋环流减弱和热交换减弱，这两者都有助于AMV暖相。
Atmospheric blocking over the northern North Atlantic, which involves isolation of large regions of air from the westerly circulation for 5 days or more, influences fundamentally the ocean circulation and upper ocean properties by affecting wind patterns. Winters with clusters of more frequent blocking between Greenland and western Europe correspond to a warmer, more saline subpolar ocean. The correspondence between blocked westerly winds and warm ocean holds in recent decadal episodes (especially 1996 to 2010). It also describes much longer time scale Atlantic multidecadal ocean variability (AMV), including the extreme pre-greenhouse-gas northern warming of the 1930s to 1960s. The space-time structure of the wind forcing associated with a blocked regime leads to weaker ocean gyres and weaker heat exchange, both of which contribute to the warm phase of AMV.