Abstract: Using integrated Water Vapor (IWV) and Liquid Water Path (LWP) data determined from 14-channel ground-based microwave radiometer named RPG-HATPRO-G3 during October of 2014 and September of 2015 in Ji'nan,seasonal,monthly,diurnal variation characteristics of IWV and LWP,as well as their variation tendencies in severe convective and spit weather were analyzed.The results show that IWV exhibited apparent monthly variation during the research period.The tendency of these variations had a relatively good correlation with the long-term monthly mean precipitations during 1981 and 2010,with the highest value in summer and the lowest value in winter.Diurnal variations of IWV were weak in all seasons,and the seasonal standard deviations were in the decreasing order of summer,autumn,spring,and winter.After counting the number of LWP data in spring,summer and autumn seasons,the number of available LWP data in cloudy days is the minimum in spring and the maximum in summer.The number of frequency the monthly LWP peaks between 0-200 g·m^-2 and declines with the increase of LWP.The number of frequency of the monthly LWP more than 1000 g·m^-2 gradually increases with the increasing precipitation in summer season.IWV and LWP increase significantly ahead of an intensive convective weather,and LWP above 1000 g·m^-2 accounts for 53.41%.IWV increases in a wave pattern before a period of spit weather,while LWP increases significantly near the beginning of spit weather.Monthly LWP concentrated between 0-200 g·m^-2 with the frequency of 86.56%.

Key words: Integrated Water Vapor, Liquid Water Path, Ground-based microwave radiometer, Severe convective