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ISSN  2096-3955

CN  10-1502/P

Citation: Xian Chen, Zhong Zhong, YiJia Hu, Shi Zhong, Wei Lu, Jing Jiang, 2019: Role of tropical cyclones over the western North Pacific in the East Asian summer monsoon system, Earth and Planetary Physics, 3, 147-156.

2019, 3(2): 147-156. doi: 10.26464/epp2019018


Role of tropical cyclones over the western North Pacific in the East Asian summer monsoon system


China Aerodynamics Research and Development Center, Mianyang Sichuan 621000, China


State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China


College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China


Jiangsu Collaborative Innovation Center for Climate Change, Nanjing University, Nanjing 210093, China

Corresponding author: Zhong Zhong,

Received Date: 2019-01-24
Accepted Date: 2019-03-20
Web Publishing Date: 2019-03-25

Precipitation observations collected at weather stations in eastern China, the NCEP/NCAR reanalysis data, the tropical cyclone (TC) Best Track Dataset, and a sensitivity numerical experiment were used in the present study to investigate the role in the East Asian summer monsoon (EASM) system played by frequent TC activities over the western North Pacific (WNP). Results indicated that, in active TC years, the EASM is stronger and the southerly winds in the lower troposphere advance farther north and reach higher latitudes. Meanwhile, the monsoon rain belt remains in the lower and middle reaches of the Yangtze River valley for a relatively short period, leading to less precipitation there. Both the western Pacific subtropical high and the South Asian high weaken with the northward shift of the ridgelines for both high-pressure systems as well as the East Asian subtropical upper-level jet. Therefore, the impacts of frequent TC activities over the WNP on each individual component of the EASM are in phase with those of the stronger EASM itself, amplifying features of the already strengthened EASM.

Key words: East Asian summer monsoon, tropical cyclone, western North Pacific

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Role of tropical cyclones over the western North Pacific in the East Asian summer monsoon system

Xian Chen, Zhong Zhong, YiJia Hu, Shi Zhong, Wei Lu, Jing Jiang