Distribution characteristics of gaseous and liquid water at the foot of Changbai Mountain in summer and autumn
Utilizing the MWP967KV multi-channel microwave radiometer,ground-based rain gauge,and L-band sounding radar data from the China Meteorological Administration Jilin Cloud Physics Field Experiment Base dur-ing June to October from 2019 to 2020,the distribution of gaseous and liquid water in the atmosphere at the foot of Changbai Mountain in summer and autumn and its evolution characteristics before precipitation were analyzed.The results show that there is good correlation between the microwave radiometer retrieved data and sounding radar da-ta,though the retrieved values are generally higher.The atmospheric precipitable water vapor(PWV)and liquid water path(LWP)exhibit the diurnal variation characteristic with the peak at night and the valley in the day.The peak appears between 01:00-03:00 during precipitation,while the valley appears around 11:00.The monthly aver-age maximum values of PWV and LWP appear in August and September respectively,because of the influence of the topography and forest vegetation at Changbai Mountain.The distribution frequency of PWV shows a rising and then a falling trend before and during precipitation,whereas the frequency ratio of LWP in the range of 0.00～0.42 mm is the highest before precipitation.The stronger the precipitation intensity is,the more concentrated the frequency distribution of PWV and LWP is,with a greater likelihood of heavy precipitation for PWV greater than 45 mm and LWP greater than 4.20 mm.A surge in both LWP and PWV occurs within 1 h before precipitation starts,with a more pronounced increase in LWP,indicating that this characteristic can serve as a reference index for the analysis of precipitation approaching forecast and artificial rain enhancement operations.
Microwave radiometerAtmospheric precipitable water vaporLiquid water path
万方数据
维普
