Intraseasonal to interannual variability of the Atlantic meridional overturning circulation from eddy-resolving simulations and observations

Intraseasonal to interannual variability of the Atlantic meridional overturning circulation from eddy-resolving simulations and observations
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根据涡旋解析模拟和观测,大西洋经向翻转环流的季节内到年际变化

DOI:
10.1002/2014jc009994
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发表时间:
2014
期刊:
Journal of Geophysical Research: Oceans
影响因子:
--
通讯作者:
Metzger, E. Joseph
Metzger, E. Joseph
中科院分区:
--
文献类型:
--
作者:
Xu, Xiaobiao;Chassignet, Eric P.;Johns, William E.;Schmitz, William J.;Metzger, E. Joseph

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利用两个1/12°涡解析模拟的结果,以及基于数据的26.5°N和41°N的输送估计,研究了2004-2012年大西洋经向翻转环流(AMOC)的时间变率。在26.5°N处,AMOC各分量的模型与观测值吻合较好,而在41°N处的吻合主要是由于Ekman输运。结果表明:(1)观测值和模式结果在季节和短时间尺度上的AMOC变率均高于年际和长时间尺度;(2)在季节内和年际时间尺度上,AMOC的变率在较宽的纬向范围内往往是一致的,但在整个北大西洋上缺乏整体的一致型;(3)在季节时间尺度上,由于热带和亚热带不同的风应力变率,AMOC在20°N以北和以南表现出明显的一致性。热带大西洋20°N以南的高AMOC变率主要来自近地表水的Ekman输送,并在一定程度上受到南极中层水在温跃层以下的输送的调节。这些结果强调了地面风对AMOC变率的影响。
Results from two 1/12° eddy‐resolving simulations, together with data‐based transport estimates at 26.5°N and 41°N, are used to investigate the temporal variability of the Atlantic meridional overturning circulation (AMOC) during 2004–2012. There is a good agreement between the model and the observation for all components of the AMOC at 26.5°N, whereas the agreement at 41°N is primarily due to the Ekman transport. We found that (1) both observations and model results exhibit higher AMOC variability on seasonal and shorter time scales than on interannual and longer time scales; (2) on intraseasonal and interannual time scales, the AMOC variability is often coherent over a wide latitudinal range, but lacks an overall consistent coherent pattern over the entire North Atlantic; and (3) on seasonal time scales, the AMOC variability exhibits two distinct coherent regimes north and south of 20°N, due to different wind stress variability in the tropics and subtropics. The high AMOC variability south of 20°N in the tropical Atlantic comes primarily from the Ekman transport of the near‐surface water, and is modulated to some extent by the transport of the Antarctic Intermediate water below the thermocline. These results highlight the importance of the surface wind in driving the AMOC variability.
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