期刊
GEOPHYSICAL RESEARCH LETTERS
卷 40, 期 10, 页码 2349-2354出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.50431
关键词
western North Pacific subtropical high; local air-sea interaction; Indian Ocean warming; seasonal march of mean state
资金
- APEC Climate Center
- International Pacific Research Center
- JAMSTEC
- NASA [NNX07AG53G]
- NOAA [NA09OAR4320075]
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 Nino/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.
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