Climatic Changes Related to Thunderstorm Days in Hainan andAnalysis of Atmospheric Circulation Background
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Abstract:
The climate characteristics of thunderstorms at 18 stations in Hainan from 1966 to 2005 are analyzed using the EOF (Empirical Orthogonal Function) method. The results indicate that there was a decreasing tendency in the thunderstorm frequency in Hainan from 1966 to 2005; there occurred less thunderstorms in the south coastal area and more in the north inland areas; thunderstorm days were mainly concentrated in the period from April to October with the peak between May and September; in abnormal thunderstorm years, an obvious negative anomaly existed in low latitude areas at 500 hPa from May to September; the subtropical high is relatively weak and farther east in active thunderstorm years, and vice verse in less active thunderstorm years. Kindex and TTindex are also analyzed,and the results show that they have certain prediction ability for thunderstorms.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.