Diurnal variation characteristics of summer rainfall in Shenyang.

By the hourly rainfall record in Shenyang over 48 years from 1961 to 2008,the basic climate characteristics of diurnal variation in summer rainfall were studied in Shenyang.The results showed that diurnal variation in summer rainfall displayed coincident rules in precipitation and rainfall frequency in Shenyang.The diurnal variation had two peak value intervals.One peak value was in afternoon to dusk.The other peak value happened in early morning.From afternoon to the first half of the night,the rainfall peak value was mainly caused by the rainfall event whose duration was less than 6 hours.From latter half of the night to early morning,the rainfall peak value was mainly caused by the rainfall event whose duration was more than 6 hours.