Characteristics of Climatic Variation of Hainan Island for Last 42 years

Based on the data of annual and seasonal mean air temperature,minimum and maximum air temperature and precipitation at eleven meteorological stations in Hainan Island from 1961 to 2002,the climatic change of Hainan Island is analyzed. The linear trend estimation indicates that annual mean temperature,minimum and maximum temperature have an evident warming trend,especially the mean minimum air temperature. Except winter precipitation appears to be an evident increase trend,the other seasonal and annual precipitation appear to be a weak increase trend in the region. The precipitation of the south part appears to be an evident increase trend,the other regions appear to be a weak increase/decrease trend. Mann-kendall analysis shows that from the end of 1970's to the end of 1980's,annual mean and seasons air temperature appear to be a transition,the warming was more evident since 1980's. The periodic analysis shows that the main period of temperature and precipitation are about 2-to 5-year and 7-to 11- year.

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