Open AccessRole of tropical cyclones over the western North Pacific in the East Asian summer monsoon system
Author(s) -
Chen Xian,
Zhong Zhong,
Hu YiJia,
Zhong Shi,
Lu Wei,
Jiang Jing
Publication year - 2019
Publication title -
earth and planetary physics
Language(s) - English
Resource type - Journals
ISSN - 2096-3955
DOI - 10.26464/epp2019018
Subject(s) - climatology , precipitation , subtropical ridge , subtropics , troposphere , tropical cyclone , east asia , environmental science , monsoon , east asian monsoon , cyclone (programming language) , geology , china , geography , meteorology , archaeology , field programmable gate array , fishery , computer science , computer hardware , biology
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.