Linkages between atmospheric blocking, sea ice export through Fram Strait and the Atlantic Meridional Overturning Circulation.
Linkages between atmospheric blocking, sea ice export through Fram Strait and the Atlantic Meridional Overturning Circulation.
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DOI：
10.1038/srep32881
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发表时间：
2016-09-13
影响因子：
4.6
通讯作者：
Prange M
中科院分区：
文献类型：
--
作者：
Ionita M;Scholz P;Lohmann G;Dima M;Prange M
作为大气动力学的一个关键的持续组成部分，北大西洋阻塞活动与欧洲地区的极端气候现象有关。它还与大西洋数十年海洋变化有关，但其与快速海洋变化的潜在联系尚未得到研究。使用基于大气再分析数据的全球海洋-海冰模型，本文显示，1962年至1966年格陵兰岛上空阻塞活动增强导致北极海冰异常积累，并最终导致海冰从北极通过弗拉姆海峡冲入北大西洋。这一事件导致 20 世纪 70 年代拉布拉多海水表层盐度显着下降以及大西洋经向翻转环流 (AMOC) 突然减弱。这些结果对 AMOC 快速变化的预测具有重要意义，并表明中高纬度大气-海洋动力学的一个重要部分需要正确表示弗拉姆海峡海冰输送和大气阻塞等天气尺度变化，这对当前耦合气候模型来说是一个挑战。
As a key persistent component of the atmospheric dynamics, the North Atlantic blocking activity has been linked to extreme climatic phenomena in the European sector. It has also been linked to Atlantic multidecadal ocean variability, but its potential links to rapid oceanic changes have not been investigated. Using a global ocean-sea ice model forced with atmospheric reanalysis data, here it is shown that the 1962–1966 period of enhanced blocking activity over Greenland resulted in anomalous sea ice accumulation in the Arctic and ended with a sea ice flush from the Arctic into the North Atlantic Ocean through Fram Strait. This event induced a significant decrease of Labrador Sea water surface salinity and an abrupt weakening of the Atlantic Meridional Overturning Circulation (AMOC) during the 1970s. These results have implications for the prediction of rapid AMOC changes and indicate that an important part of the atmosphere-ocean dynamics at mid- and high latitudes requires a proper representation of the Fram Strait sea ice transport and of the synoptic scale variability such as atmospheric blocking, which is a challenge for current coupled climate models.
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