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Meiyu Monitoring Feature in 2013 and Climatological Characteristics of Meiyu in Jiangxi

Wu Shanshan;Zhang Chaomei;Jiangxi Climate Center;  
According to the relevant indexes of"Meiyu monitoring service",the monitoring of Meiyu was executed in Jiangxi. The monitoring results show that in 2013 the onset date of Meiyu was May 25,and the end date was June 29. By using the EOF method to study the temporal and spatial distribution of Meiyu,it found that Meiyu distribution of the same type accounts for77.8% of the total variance. In addition,the 55-year Meiyu characteristic variable data of 37 stations were analyzed. According the climate average results,it shows that the onset date of Meiyu is June 8,the end date of Meiyu is July 1,the length of rainy season is 23 days, the rainfall and strength are 352.7 mm and 0.18,respectively. There are obvious correlations among these Meiyu characteristic variable data. The Meiyu precipitation is greater due to its earlier onset,later end and longer duration. Also there is a prominent interannual and interdecadal variation of Meiyu characteristic variable data. According to the Morlet wavelet analysis method,the Meiyu characteristics present 2-3 year,6-8 year,13-15 year and 21-23 year periodic variations.
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