Abstract
In this study, a strong negative correlation was found between East Indian Ocean (EIO) SST and frequency of summertime tropical cyclone (TC) affecting Korea. For the Warm EIO SST years, the TCs mostly occurred in the southwestern region of tropical and subtropical western Pacific, and migrated west toward the southern coast of China and Indochinese peninsula through the South China Sea. This is because the anomalous easterlies, induced by the development of anomalous anticyclone (weakening of monsoon trough) from the tropical central Pacific to the southern coast of China, served as the steering flows for the westward migration of TCs. In contrast, for the cold EIO SST years, the TCs mostly occurred in the northeastern region of tropical and subtropical western Pacific and migrated toward Korea and Japan located in the mid-latitudes of East Asia through the East China Sea. This is because the northeastward retreat of western North Pacific subtropical high was more distinct for the cold EIO SST years compared to the warm EIO SST years. Therefore, the TCs of warm EIO SST years weakened or dissipated shortly due to the effect of geographical features as they land on the southern coast of China and Indochinese peninsula, whereas the TCs of cold EIO SST years had stronger intensity than the TCs of warm EIO SST years as sufficient energy is supplied from the ocean while moving toward Korea and Japan.
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This research is supported by the project “Management of National Typhoon Center”, and “Development of technology for the short and long range typhoon forecast” in “Development and application of technology for weather forecast (NIMR-2013-B-1)” funded by Korea Meteorological Administration (KMA).
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Choi, KS., Park, S., Chang, KH. et al. A possible relationship between East Indian Ocean SST and tropical cyclone affecting Korea. Nat Hazards 76, 283–301 (2015). https://doi.org/10.1007/s11069-014-1489-5
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DOI: https://doi.org/10.1007/s11069-014-1489-5