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Shou-Jun Chen, Ying-Hwa Kuo, Pei-Zhong Zhang, and Qi-Feng Bai


A climatological analysis of cyclogenesis over east Asia and the adjacent northwest Pacific for the period 1958–87 based on the Beijing Meteorological Center' historical surface maps is presented. The most active cyclogenetic areas were: 1) the lee sides of the Altai-Sayan, Stanovoi, and Great Xinganling mountains, and 2) the East China Sea and the Sea of Japan. The former was related to lee cyclogenesis and the latter to coastal cyclogenesis.

After zonal average, the primary zone of cyclogenesis emerged between 45° and 50°N, constituted mainly by the Altai-Sayan lee cyclogenesis. The Altai-Sayan lee cyclogenesis occurred in all seasons, with peak frequencies from April to May and from August to September. The secondary zone of cyclogenesis, located at 30°–35°N with half the frequency of the primary zone, was a result of East China Sea cyclogenesis. The coastal cyclogenesis occurred only in the cold season and disappeared in summer and early autumn. The total cyclogenetic events over east Asia reached a minimum in January. By contrast, cyclogenesis is still quite active over North America in January.

The trend of east Asia cyclogenesis showed a decline from 1958–77, which was coincident with the finding of Whittaker and Horn in North America. After 1977, no such decline was found.

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Shou-Jun Chen, Ying-Hwa Kuo, Pai-Zhong Zhang, and Qi-Feng Bai


The climatology of explosive cyclogenesis off the east Asian coast was studied, based on 30 years (1958–87) of surface analyses. There were two favorable areas for explosive deepening, one over the eastern Sea of Japan, and the other over the northwestern Pacific, east and southeast of Japan. The latter was located close to the warm Kuroshio Current. The frequency of explosive cyclogenesis reached a local minimum over Japan. The geographic distribution of explosive-cyclone frequency suggests that the explosive cyclogenesis is influenced by the Japanese islands. In addition, a positive correlation is found between explosive-cyclogenesis frequency and the El Niño episodes during 1958–87. The physical relationship between these two phenomena, however, is not well understood.

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