Contrast Analyses on Variation Characters of Vertically Integrated Liquid Water Content about Hail Cloud Cell and Thundercloud Cell
LIU Zhi-guo1-2,YANG Jian-cai1,TAO Jian-hong1,FU Zhao1,LIANG Hai-he3(1.Lanzhou Central Meteorological Observatory,Key(Open) Laboratory of Arid Climatic Change and Reducing Disaster ofGansu Province,China Meteorological Administration,Lanzhou 730020,China;2.State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China;3.Atmosphere Observation Technology Center of China Meteorological Administration,Beijing 100081,China)
Based on the constant altitude plan data of reflectivity factor of CINRADwhich is interpolated with 3D-Barnes scheme,VIL(Vertically Integrated Liquid Water Content,VIL) about cell is calculated with its theoretical model,and the maximum of VIL (VILmax)is identified by use of MAX function.With methods of statistic and piecewise function,the variation character of VILmax and its application to identification of hail cloud is detaily analyzed for 32 severe convective cloud cellson the northeast side of Tibetan Plateau during May~August 2004—2005.Results show that VILmax about severe convective cloud cell during variation process is increasing first and decreasingthen,there is unimodal distribution in time series of VILmax,!explosive increasing" and !suddenly decreasing"about VILmax are to differentiate an important characteristic of hail cloud cell and thundercloud.!explosive increasing"process of VILmax about hail cloud cell appear twice within four data time intervals before the first hail shooting,with no hail shooting on the surface for the first "explosive increasing" and after the hail shooting 1～2 data time intervals companing with the second "explosive increasing",there is nothe first "explosive increasing" for the second hail shooting of same cell,and the hail shooting on the surface stop with !suddenly decreasing".!Positive(negative) peak" of GVILmax(the rate of change about VILmax)is completely correspond to !explosive increasing and suddenly decreasing"of VILmax about hail cloud cell in time,the identification of hail cloud settedGVILmaxis greater workable valuein operation.