How can anomalous western North Pacific Subtropical High intensify in late summer?
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- Baoqiang Xiang
- International Pacific Research Center University of Hawaii at Manoa Honolulu Hawaii USA
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- Bin Wang
- International Pacific Research Center University of Hawaii at Manoa Honolulu Hawaii USA
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- Weidong Yu
- Center for Ocean and Climate Research First Institute of Oceanography, State Oceanic Administration Qingdao China
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- Shibin Xu
- International Pacific Research Center University of Hawaii at Manoa Honolulu Hawaii USA
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説明
<jats:title>Abstract</jats:title><jats:p>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.</jats:p>
収録刊行物
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- Geophysical Research Letters
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Geophysical Research Letters 40 (10), 2349-2354, 2013-05-28
American Geophysical Union (AGU)