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http://dx.doi.org/10.5467/JKESS.2015.36.1.68

Possible Influence of Western North Pacific Monsoon on Tropical Cyclone Activity Around Korea  

Choi, Ki-Seon (Policy Research Department. National Institute of Meteorological Research)
Park, Ki-Jun (Policy Research Department. National Institute of Meteorological Research)
Lee, Kyungmi (Policy Research Department. National Institute of Meteorological Research)
Kim, Jeoung-Yun (Policy Research Department. National Institute of Meteorological Research)
Kim, Baek-Jo (Policy Research Department. National Institute of Meteorological Research)
Publication Information
Journal of the Korean earth science society / v.36, no.1, 2015 , pp. 68-81 More about this Journal
Abstract
In this study, the correlation between the frequency of summer tropical cyclones (TC) affecting areas around Korea over the last 37 years and the western North Pacific monsoon index (WNPMI) was analyzed. A clear positive correlation existed between the two variables, and this high positive correlation remained unchanged even when excluding El Ni$\tilde{n}$o-Southern Oscillation (ENSO) years. To investigate the causes of the positive correlation between these two variables, ENSO years were excluded, after which the 8 years with the highest WNPMI (positive WNPMI phase) and the 8 years with the lowest WNPMI (negative WNPMI phase) were selected, and the average difference between the two phases was analyzed. In the positive WNPMI phase, TCs usually occurred in the eastern waters of the tropical and subtropical western North Pacific, and tended to pass the East China Sea on their way north toward Korea and Japan. In the negative WNPMI phase, TCs usually occurred in the western waters of the tropical and subtropical western North Pacific, and tended to pass the South China Sea on their way west toward the southeastern Chinese coast and the Indochina peninsula. Therefore, TC intensity was higher in the positive WNPMI phase, during which TCs are able to gain sufficient energy from the sea while moving a long distance to areas nearby Korea. TCs also tended to occur more often in the positive WNPMI phase. In the difference between the two phases regarding 850 and 500 hPa streamline, anomalous cyclones were reinforced in the tropical and subtropical western North Pacific, while anomalous anticyclones were reinforced in mid-latitude East Asian areas. Due to these two anomalous pressure systems, anomalous southeasterlies developed in areas near Korea, with these anomalous southeasterlies playing the role of anomalous steering flows making the TCs head toward areas near Korea. Also, due to the anomalous cyclones developed in the tropical and subtropical western North Pacific, more TCs could occur in the positive WNPMI phase.
Keywords
tropical cyclones; western North Pacific monsoon; El Nino-Southern Oscillation;
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