Tendency and Mutation Analysis of Annual Temperature and Precipitation of Hefeng County in Recent 57 Years
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Abstract:
Based on the Mann-Kendall nonparametric test and cumulative departure curve analysis on the annual temperature and precipitation of Hefeng County from 1954 to 2010, the mutation characteristics of annual temperature and precipitation were detected using the Mann-Kendall and Pettitt mutation tests. The results showed that the cumulative departure of temperature of 20 years is positive from 1988 to 2010, which indicated that the temperature has a significantly increasing trend from 1988 and it is verified by the Mann-Kendall nonparametric test. The mutation time of temperature was not detected. Annual precipitation had a gradually increasing trend with the lowest precipitation occurring in 1977 and the highest in 2007, but the trend was not significant and the occurrence of dry and wet years had an interlaced distribution. The mutation time of precipitation was detected as 2007.
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