Tropical Indian Ocean Influence on Northwest Pacific Tropical Cyclones in Summer following Strong El Niño*
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- Yan Du
- LED, South China Sea Institute of Oceanology, CAS, Guangzhou, China
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- Lei Yang
- LED, South China Sea Institute of Oceanology, CAS, Guangzhou, China
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- Shang-Ping Xie
- IPRC, and Department of Meteorology, University of Hawaii at Manoa, Honolulu, Hawaii, and POL, Ocean University of China, Qingdao, China
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説明
<jats:title>Abstract</jats:title> <jats:p>In the summer following a strong El Niño, tropical cyclone (TC) number decreases over the Northwest (NW) Pacific despite little change in local sea surface temperature. The authors’ analysis suggests El Niño–induced tropical Indian Ocean (TIO) warming as the cause. The TIO warming forces a warm tropospheric Kelvin wave that propagates into the western Pacific. Inducing surface divergence off the equator, the tropospheric Kelvin wave suppresses convection and induces an anomalous anticyclone over the NW Pacific, both anomalies unfavorable for TCs. The westerly vertical shear associated with the warm Kelvin wave reduces the magnitude of vertical shear in the South China Sea and strengthens it in the NW Pacific, an east–west variation that causes TC activity to increase and decrease in respective regions. These results help improve seasonal TC prediction.</jats:p>
収録刊行物
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- Journal of Climate
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Journal of Climate 24 (1), 315-322, 2011-01-01
American Meteorological Society