Contrasting Responses of the Hadley Circulation to Equatorially Asymmetric and Symmetric Meridional Sea Surface Temperature Structures
Contrasting Responses of the Hadley Circulation to Equatorially Asymmetric and Symmetric Meridional Sea Surface Temperature Structures
复制标题
哈德来环流对赤道不对称和对称经向海面温度结构的对比响应
DOI：
10.1175/jcli-d-16-0171.1
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发表时间：
2016-12-01
影响因子：
4.9
通讯作者：
Guo, Yipeng
中科院分区：
文献类型：
--
作者：
Feng, Juan;Li, Jianping;Guo, Yipeng
研究了1948-2013年热带海表温度（SST）不同纬向结构对年平均Hadley环流（HC）的影响。通过将SST和HC的变化分解为两个分量，即赤道非对称分量（SST的SEA和HC的HEA）和赤道对称分量（SST的SES和HC的HES），结果表明，SEA和SES的长期变率很好地捕捉了SST赤道非对称和对称变化的时间变化。HEA的变化与SEA的变化密切相关，HES的变化与SES的变化密切相关。然而，HEA对SEA中给定振幅变化的响应比HES对SES中相同振幅变化的响应强（5倍）。理论和数值模式进一步证实了这一点，表明SST的纬向结构在决定HC异常中起着至关重要的作用。这一结果可以解释为什么HC的主模态在其长期变率中被赤道非对称模态所支配。
The impacts of different meridional structures of tropical sea surface temperature (SST) on the Hadley circulation (HC) in the annual mean are investigated during the period 1948-2013. By decomposing the variations in SST and the HC into two components-that is, the equatorially asymmetric (SEA for SST, and HEA for HC) and the equatorially symmetric (SES for SST, and HES for HC) parts-it is shown that the long-term variability in SEA and SES captures well the temporal variations in equatorially asymmetric and symmetric variations in SST. The variation in HEA is closely linked to that of SEA, and the variation in HES is connected with that of SES. However, the response of HEA to a given amplitude variation in SEA is stronger (by; 5 times) than that of HES to the same amplitude variation in SES. This point is further verified by theoretical and numerical models, indicating that the meridional structure of SST plays a crucial role in determining the anomalies in HC. This result may explain why the principal mode of HC is dominated by an equatorially asymmetric mode in its long-term variability.