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Variations in Typhoon Landfalls over China

Advances in Atmospheric Sciences 2006年第5期23卷 665-677页

作者： Emily A.FOGARTY James B. ELSNER Thomas H. JAGGER Kam-biu LIU kin-sheun louie Department of Geography The Florida State University TallahasseeFlorida Department of Anthropology and Geography The Louisiana State University Department of Public and Social Administration City University of Hong Kong

The interannual variability in typhoon landfalls over China is investigated using historical and modern records. For the purpose of substantiating and elaborating upon the claim of north to south variation in tropical cyclone activity over China, a north-to-south anti-correlation in yearly activity is confirmed in the historical cyclone records. When cyclone activity over the province of Guangdong is high （low）, it tends to be low （high） over the province of Fujian. A similar spatial variation is identified in the modern records using a factor analysis model, which delineates typhoon activity over the southern provinces of Guangdong and Hainan from the activity over the northern provinces of Fujian, Taiwan, Zhejiang, Shanghai, Jiangsu, and Shandong. A landfall index of typhoon activity representing the degree to which each year follows this pattern of activity is used to identify correlated climate variables. A useful statistical regression model that includes sea-level pressure differences between Mongolia and western China and sea-surface temperature （SST） over the northwestern Pacific Ocean during the summer explains 26% of the interannual variability of the landfall index. It is suggested that a stronger than normal north-south pressure gradient increases the surface easterly wind flow over northern China： this, coupled with lower SST over the Pacific, favors typhoons taking a more westerly track toward southern China.

关键词： typhoons southern China historical record climate variables

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