重庆市绵雨的分类与指标及其时空分布规律

按时间(季节)差异将重庆市绵雨划分为：春绵雨、初夏绵雨、盛夏绵雨、秋绵雨和冬绵雨5种。提出了重庆市绵雨的单站指标、区域指标和分区指标，进而全面分析了各季节绵雨的发生情况，揭示了重庆绵雨的时空分布规律。从季节来看，以秋绵雨最为突出，发生频率达77．9％，初夏次之，为59．6％，其它季节在30％左右；重绵雨和严重绵雨主要发生在秋季和初夏；其区域分布特征是，春季以东南部较多，盛夏分布差异相对较小，初夏、秋季和冬季都是西部和东南部多，东北部少。分别划分了各季节绵雨的分布类型变化趋势。

ON CONTINUOUS RAINY DAY CLASSIFICATION, CRITERIA AND THE SPATIAL AND TEMPERAL DISTRIBUTIONS IN CHONGQING

According to differences in every season,continuous rainy days are classified into5types-spring continuous rainy days,early summer continuous rainy days,midsummer continuous rainy days,autumn continuous rainy days and winter continuous rainy days.In this paper the criteria of continuous rainy days for a single station,the sub-region,as well as the whole region of Chongqing were put forward firstly,and then the frequent occurances of continuous rainy days were analysed systematically,which revealed the spatial and temperal distributions and types of confiuous rainy days of Chongqing.To the other types,autumn continuous rainy days have a frequency of77.9%.The early summer continuous rainy days have a frequency of29.6%.The others have a frequency of about30%.Serious and the most serious continuous rainy days occur mainly in autumn and early summer.Distribution characteristics of continuous rainy days in all seasons are concluded,The frequency is higher in the southeast part than in other parts in spring.The difference of frequency isn' t markedly in midsummer.In west and southeast parts there is a higher frequency,but in northeast part there is lower freguency in early summer,autumn and winter.The distribution types and regularity of continuous rainy days in every season are pointed out.