Abstract:

Abstract：Based on the sunshine hours data of meteorological stations from 1957-2008，the characteristics of sunshine hours change in Guangdong Province Eastern Area had been studied with the methods of accumulative anomalies, Mann-kendall test,wavelet analysis.The result indicates that，in terms of the average of the whole area，the sunshine hours of 1960s was the most of the sunshine hours of 1957-2008,followed by the earlierof this century, 1980s was the least，and the greatest amplitude season was spring，followed by winter，summer and autumn were not obvious.Mutation test showed that the age 1960s-1970s sunshine hours increased rapidly，entered a high sunshine hours＇climatology,and the sunshine hours decreased since 1980s. According to the main periods of annual and seasonal sunshine hours change，it will be mainly in the less period for the large time scale in the future，and in the 12-14a time scale，it will be mainly in the more period，and in the small time scale(2-4a)，it will be mainly in the less period. Spatial distribution of the change rate showed that the trend was general but not universal，most of the area had decreased but a few had increased.