Characteristics of summer diurnal precipitation and the causes of its differences in Guangxi
Based on the observed daily precipitation data from 89 meteorological stations in Guangxi from 1979 to 2022,this study systematically investigates the diurnal precipitation variations and their differences in Guangxi in terms of the amount of precipitation of different magnitudes during both daytime and nighttime,the spatial distribution of the numbers of precipitation days,and the contribution rate to the total precipitation,and uses the reanalysis data to investigate the causes of the diurnal differences in precipitation in Guangxi.The results show that:(1)for precipitation and the number of precipitation days,the coastal areas of Guangxi have a higher amount of precipitation during both day and night.Apart from the coastal areas,the precipitation during daytime exhibits a pattern of"more precipitation in southern Guangxi and less in northern Guangxi",while in nighttime shows a distribution of"less precipitation in southern Guangxi and more in northern Guangxi".Moreover,this distribution pattern is found in the different levels of precipitation intensity.(2)Daytime precipitation contributes more significantly to the total precipitation in Guangxi than at night.However,for rainstorms,but the contribution of heavy rainfall is greater at night than during the daytime.(3)For rainstorms,the precipitation intensity at nighttime is greater than that in the daytime,with a significant increasing trend(0.72 mm·a-1).(4)The stronger southerly winds,upward motion,and moisture convergence during nighttime in Guangxi are conducive to the generation of precipitation in the northern areas of Guangxi.(5)The primary moisture transport in Guangxi mainly transports in the meridional direction from south to north,with stronger water vapour transport at night than during the day.
万方数据
维普
