Abstract:

Temperature data series for each station in Dongting Lake region during 1910-2010 had been tested for their homogeneity, and the series were adjusted in terms of meteorological historical information by a statistical method. The missing data over the Dongting Lake region before 1951 were then interpolated using data from the surrounding meteorological stations in order to obtain the complete series. The revised temperature series over the Dongting Lake Region during 1910-2010 were built and its changes were analyzed. The results indicate that the annual mean temperature has a significant warming trend during 1910-2010, and it has a largest ascending amplitude in winter and spring, and then in autumn, while it has no significant change in summer. Temperature variation over Dongting Lake Region has several significant warm-cold alternations and it is more frequently in this study area than in whole China region. Annual and seasonal mean temperatures are warming abrupt changes in the recent 100 years, except summer temperature. The wavelet analysis suggests that the annual mean and four seasonal mean temperatures in recent 100 years have experienced two climatic shifts from cold to warm.

Key words: Dongting Lake region, Construction of temperature series, Wavelet analysis