Spatial-temporal Features and Variation Trends of Thunderstorms in Hunan
Yao Rong
Xu Lin
Tang Jia
Wang Xiaolei
Abstract：Using the observation data at meteorological stations in Hunan province from 1971 to 2010,the climate characteristics of thunderstorm days were analyzed by means of climatic trends,empirical orthogonal function and wavelet analysis.The results show that the number of annual mean thunderstorm days is more,the annual fluctuation is large,while the total trend of thunderstorm days is decreasing in Hunan.The seasonal variation of thunderstorm is obvious.The increasing water vapor transport and instability energy is conducive to the occurrence of thunderstorm in spring and summer.The thunderstorm has obvious differences in daily variation.It appears primarily in the morning in spring,and in the afternoon to evening in summer because the convections develop quickly in the summer afternoon.The spatial distribution of thunderstorm days in Hunan can be divided into entire area type,south-north type and ‘T’font type.The entire area type is the main feature of thunderstorm distribution,which is related to the impact of the same weather system and common factors.The thunderstorm days show the short oscillating periods of 2-4 years and 5-6 years,and the long periods of 10-12 years.
Keywords：thunderstormtemporal and spatial distributionclimatic trendEOFwavelet analysis
Publication Date：2017-07-02
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：6( 65-70 )