Spatial and Temporal Distribution Characteristics of Summer Precipitation in the Monsoon Region of Eastern China
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Abstract:
EOF method was applied to analyze the summer precipitation field (June- August) in the monsoon region of eastern China. Three main spatial distribution types of precipitation were obtained, including the even distribution of flood and drought type, flood (drought) in the north and south while drought (flood) in the center type, and flood (drought) in the south while drought (flood) in the north type. The Mann-Kendall test and power spectrum analysis were used to analyze the temporal characteristics of each above type of spatial distribution. The results showed that (1) no mutations are detected for the first and second time coefficients but there is a mutation for the third time coefficient. The mutation occurred in the early 1970s with the type of spatial distribution varying from “southern drought and northern flood” to the opposite; and (2) a cycle of 50 years exists in the first time coefficient, a cycle of two years in the second time coefficient, and two cycles with a main cycle of 50 years and a sub-cycle of 2 to 3 years in the third time coefficient. The correlation analysis between monsoon indices and time coefficients showed that there are positive correlations between the second time coefficients and monsoon indices of East Asia and South China Sea, which indicated the intensity of monsoon on summer precipitation.
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