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Distinct Interdecadal Change Contrasts Between Summer and Autumn in Latitude‐Longitude Covariability of Northwest Pacific Typhoon Genesis Locations
Author(s) -
Wu Zeming,
Hu Chundi,
Wang Junbin,
Chen Weizhen,
Lian Tao,
Yang Song,
Chen Dake
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2021gl093494
Subject(s) - typhoon , longitude , climatology , latitude , subtropical ridge , sea surface temperature , environmental science , subtropics , global warming , climate change , geography , oceanography , geology , precipitation , meteorology , geodesy , fishery , biology
This study investigates seasonality of interdecadal changes in latitude‐longitude covariability of the Northwest Pacific (WNP)‐mean tropical cyclogenesis location (TCGL). It is found that the latitude‐longitude covariability in WNP‐mean TCGL of typhoons has experienced seasonally distinct interdecadal shifts since 1998, weakening in summer and strengthening in autumn. Since significant westward shift of WNP‐mean TCGL exists in both summer and autumn, but robust poleward shift is only detected in autumn. The linchpin of such seasonal difference is the subtropical WNP sea‐surface temperature (SST) warming in the key region of 125°–140°E, 15°–30°N, where numbers of typhoons increase in autumn but not in summer. Two main factors are responsible for the SST warming in the key region: the interdecadal trend of local SST and the Central Pacific La Niña‐teleconnected warming. However, neither condition occurs in summer, highlighting the importance of seasonal difference in climatological background when interpreting climatic changes in typhoons.