Abstract
The study surveys the tropical cyclone (TC) activities in the Northwestern Pacific region during the summer monsoon season (SMS) (June–July) in the Northeast Asian region (North China, Korea, and Japan). The positive (negative) SMS rainfall years in the region show that not only the TC genesis frequency, but also the TC frequency which affects the Northeast Asian countries, are low (high) in the tropical and subtropical northwest Pacific. That is, the TCs mainly move to the southern part of China or up to the east sea far from Japan in the positive SMS rainfall years. The study analyzes the difference between the two groups in the 500 hPa streamline to investigate TC activities for the groups. The large-scale anomalous anticyclone and the anomalous cyclone were enlarged in the tropical and subtropical Northwestern Pacific and from Manchuria to the eastern Japan, respectively. Due to such anomalous pressure system patterns being strengthened during the positive SMS rainfall years, the tropical Northwestern Pacific below 20°N fortified anomalous easterlies, causing a lot of TCs during those years to move to the southern part of China along with these anomalous steering flows (anomalous easterlies). In addition, the anomalous anticyclone that is located in the tropical and subtropical Northwestern Pacific caused a low TC genesis frequency during the positive SMS rainfall years.
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Choi, KS., Cha, YM., Kang, SD. et al. Relationship between tropical cyclone activities in the Northwest Pacific area and the summer monsoon rainfall in the Northeast Asian region. Theor Appl Climatol 121, 279–288 (2015). https://doi.org/10.1007/s00704-014-1237-5
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DOI: https://doi.org/10.1007/s00704-014-1237-5