Comparing analysis of feature of drought and waterlogging on primary summer(July) in Fujian

The precipitation data in July at 25 representative meteorological stastions in Fujian Province,500hPa height data in northern hemisphere and monthly mean data of sea temperature in north Pacific from 1960 to 2000 were selected. First the model of drought and waterlogging were defined. Next the variable regularity of precipitation was revealed. Finally the model feature of 500hPa circulation and sea temperature in drought and waterlogging was comparatively analyzed,four primary results were found:1) The drought and waterlogging were about two times in ten years in primary summer in Fujian Province; 2) 2a, 5～7a, 19a and 9a periodic vibrations were comparatively evident; 3) The polar vortex in northern hemisphere was weaker(stronger) than normal, the blocking position around the Ural Mountain was comparatively evident(misty), the path of cold air was by east(west),the subtropical high over the West Pacific was stronger (weaker) and by south (north), height of mid latitude in East Asia was lower(higher), the trough of centre in Pacific was deeper(shallower), the distribution characteristics anomaly of high ,middle, low latitude in East Asia was +-+(-+-) , those results were helpful to provide a favourable circulation background for causing drought(waterlogging) in primary summer in Fujian Province under this circulation collocation;4)When the sea temperature was higher(lower) than normal in Kuroshio region,and lower(higher) than normal on the eastern section of mid Pacific round equatorial region,the drought(waterlogging) were easily occured in primary summer in Fujian Province.