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Joint Impacts of SSTA in Tropical Pacific and Indian Oceans on Variations of the WPSH

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Abstract

Using the NCEP/NCAR reanalysis and HadISST sea surface temperature (SST) data, the joint effects of the tropical Indian Ocean and Pacific on variations of area of the summertime western Pacific subtropical high (WPSH) for period 1980–2016 are investigated. It is demonstrated that the central tropical Indian Ocean (CTI) and central equatorial Pacific (CEP) are two key oceanic regions that affect the summertime WPSH. During autumn and winter, warm SST anomalies (SSTAs) in CEP force the Walker circulation to change anomalously, resulting in divergence anomalies over the western Pacific and Maritime Continent (MC). Due to the Gill-type response, the abnormal anticyclonic circulation is generated over the western Pacific and South China Sea (SCS). In the subsequent spring, the warm SSTAs in CEP weaken, while the SST over CTI demonstrates a lagged response to Pacific SSTA. The warm CTISSTA and CEP-SSTA cooperate with the eastward propagation of cold Kelvin waves in the western Pacific, leading to the eastward shift of the abnormal divergence center that originally locates at the western Pacific and MC. The anticyclone forced by this divergence subsequently moves eastward, leading to the intensification of the negative vorticity there. Meanwhile, warm SSTA in CTI triggers eastward propagating Kelvin waves, which lead to easterly anomalies over the equatorial Indian Ocean and Indonesia, being favorable for maintenance and intensification of the anticyclone over the SCS and western Pacific. The monsoonal meridional–vertical circulation strengthens, which is favorable for the intensification of the WPSH. Using SSTA over the two key oceanic regions as predictors, a multiple regression model is successfully constructed for prediction of WPSH area. These results are useful for our better understanding the variation mechanisms of WPSH and better predicting summer climate in East Asia.

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Authors and Affiliations

  1. Key Laboratory of Ministry of Education for Meteorological Disasters/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, 210044, China

    Daili Qian, Zhaoyong Guan & Weiya Tang

  2. State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, 100081, China

    Daili Qian

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  1. Daili Qian
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  2. Zhaoyong Guan
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  3. Weiya Tang
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Correspondence to Zhaoyong Guan.

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Supported jointly by the China Meteorological Administration Special Public Welfare Research Fund (GYHY201406024), National Natural Science Foundation of China (41330425), Creative Program of the State Key Laboratory of Severe Weather (2015LASW-A03), and Priority Academic Program Development (PAPD) project of Jiangsu Province.

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Qian, D., Guan, Z. & Tang, W. Joint Impacts of SSTA in Tropical Pacific and Indian Oceans on Variations of the WPSH. J Meteorol Res 32, 548–559 (2018). https://doi.org/10.1007/s13351-018-7172-0

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