Decreased Response Contrast of Hadley Circulation to the Equatorially Asymmetric and Symmetric Tropical SST Structures during the Recent Hiatus
Decreased Response Contrast of Hadley Circulation to the Equatorially Asymmetric and Symmetric Tropical SST Structures during the Recent Hiatus
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DOI：
10.2151/sola.2017-033
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发表时间：
2017
期刊：
影响因子：
1.9
通讯作者：
Juan Feng;Jianping Li;Yaqi Wang;Yipeng Guo
中科院分区：
文献类型：
--
作者：
Juan Feng;Jianping Li;Yaqi Wang;Yipeng Guo
Hadley环流（HC）的变化受下垫面海温（SST）的影响。HC对SST纬向结构的对比响应在两个时期之间进行了检验，一个在最近的变暖间断之前，另一个在最近的变暖间断期间（即，1979 - 1998年和1999 - 2015年）。通过将HC和SST的变化分解为赤道非对称分量（HEA对HC; SEA对SST）和对称分量（HES对HC; SES对SST），定量分析了HEA对SEA的响应和HES对SES的响应。多次再分析一致表明，在1999 - 2015年期间，HEA对SEA的响应相对于HES对SES的响应的比率明显下降。这是因为HEA对SEA的响应在此期间被抑制，而HES对SES的响应增强，表明在这两个期间所涉及的海气相互作用发生了相应的变化。进一步的分析发现，太平洋海温的变化可能在决定HC对SST的响应比在最近的间断中的减少中起着重要的作用。（引用：Feng，J.，J. Li，Y. Wang和Y.郭，2017年：Hadley环流对赤道非对称和对称热带SST结构艾德响应对比度在近期间断期间减小。SOLA，13，181−185，doi：10.2151/sola.2017-033.）
Variations of the Hadley circulation (HC) are influenced by the underlying sea surface temperature (SST). The contrasting response of the HC to meridional structure of SST is examined between two periods, one prior to and the other during the recent warming hiatus (i.e., 1979−1998 and 1999−2015). By decomposing the variations of HC and SST into equatorially asymmetric (HEA for HC; SEA for SST) and symmetric components (HES for HC; SES for SST), the HEA response to SEA and the HES response to SES are quantitatively analyzed. Multiple reanalyses consistently indicate that the ratio of the response of HEA to SEA with respect to that of HES to SES is clearly decreased in the period 1999−2015. This is because the response of HEA to SEA is suppressed in this period, while the response of HES to SES is enhanced, suggesting a corresponding change in the air–sea interactions involved during the two periods. Further examination found that the variation of SST over Pacific may play an important role in determining the reduced response ratio of HC to SST in the recent hiatus. (Citation: Feng, J., J. Li, Y. Wang, and Y. Guo, 2017: Decreas ed response contrast of Hadley circulation to the equatorially asymmetric and symmetric tropical SST structures during the recent hiatus. SOLA, 13, 181−185, doi:10.2151/sola.2017-033.)