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How can anomalous western North Pacific Subtropical High intensify in late summer?
Author(s) -
Xiang Baoqiang,
Wang Bin,
Yu Weidong,
Xu Shibin
Publication year - 2013
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 - 10.1002/grl.50431
Subject(s) - subtropical ridge , climatology , forcing (mathematics) , subtropics , precipitation , monsoon , environmental science , trough (economics) , storm , tropical cyclone , madden–julian oscillation , convection , geography , geology , meteorology , macroeconomics , fishery , economics , biology
The western North Pacific (WNP) Subtropical High (WNPSH) is a controlling system for East Asian Summer monsoon and tropical storm activities, whereas what maintains the anomalous summertime WNPSH has been a long‐standing riddle. Here we demonstrate that the local convection‐wind‐evaporation‐SST (CWES) feedback relying on both mean flows and mean precipitation is key in maintaining the WNPSH, while the remote forcing from the development of the El Niño/Southern Oscillation is secondary. Strikingly, the majority of strong WNPSH cases exhibit anomalous intensification in late summer (August), which is dominantly determined by the seasonal march of the mean state. That is, enhanced mean precipitation associated with strong WNP monsoon trough in late summer makes atmospheric response much more sensitive to local SST forcing than early summer.