昆明市不同等级降水日数的时空分布特征

采用线性趋势法,Mann-Kendall检验的方法,分析了近42年（1971-2012年）昆明市12个测站逐日降水资料的时空分布特征和变化规律。昆明市的小雨日数占总雨日数的比重最大,总雨日数的减少主要是由于小雨日数的减少所致。2001年后降水的减少趋势更加明显,且在2009年后出现极端化发展的趋势。全市年总雨日数及不同等级降水日数分布不均匀,存在两个多雨日中心。各站年总降水日数和小雨日数均呈减少趋势,但是东川不显著;中雨、大雨和暴雨日数大部以缓慢减少为主,部分有所增加,但变化趋势并不明显。

DIFFERENT LEVELS OF SPATIAL AND TEMPORAL RAINFALL DISTRIBUTION OF THE NUMBER OF DAYS IN KUNMING

Linear trend method, Mann -Kendall test methods, analysis of nearly 42 years （1971 to 2012） Kunming 12 stations spatial and temporal distribution and variation of dally rainfall data. Drizzle the proportion of the total number of days in Kunming, the maximum number of rainy days, reducing the total number of rainy days was mainly due to decrease in number of days due to rain. Precipitation decreasing trend after 2001 is more obvious, and trends in the development of extreme after 2009. The city＇s total number of rainy days and the num- ber of different grades in the uneven distribution of precipitation days, there are two rainy day centers. The total number of precipitation days in each station and rain for several days showed a decreasing trend, but not signifi- cant Dongchuan; moderate rain, heavy rain and storm slowly reduce the number of days to most main part of the increase, but the trend is not obvious.