摘要
利用常规观测资料、地面加密区域自动站观测资料、NCEP/NCAR资料、FY-2E卫星云图等资料对2012年7月4—5日潍坊地区出现的首场局地大暴雨天气过程进行了分析。分析表明:此次局地大暴雨的主要影响系统为高空低槽、低涡切变线、低空急流和气旋。局地大暴雨区域与水汽通量大值区和辐合中心比较对应。超低空急流出现的时间和位置对降水强度的增加和出现的区域具有重要作用。地面中小尺度辐合中心的持续时间对此次局地大暴雨的贡献较大。临朐区域站出现大暴雨与特殊地形有关。此次暴雨是出现在等θe线陡立密集区内、对流层低层MPV1<0的对流不稳定条件下且MPV2绝对值得到较大增长的区域。中尺度对流云团范围和强度的不断变化对判断暴雨的发生发展有重要的指示意义。
Based on the routine observational data,dense AWS data,NCEP/NCAR data and FY-2E data,ananalysis of the first local heavy rainstorm process on 4 to 5 July 2012 in Weifang city is conducted.The resultshows that the main influencing systems of the local heavy rainstorm are prior trough,low vortex shear line,lowlevel Jet and cyclone.The area of local rainstorm corresponds to larger water vapor flux area and convergencecenter.The timing and location of super low level jet plays an important role in increase and emergence area ofprecipitation intensity.The surface mesoscale and microscale convergence center contributes to localrainstorm.The emergence of heavy rainstorm in Linqu regional station is related to special terrain.It occurredin the very stiff and dense section of moist isentropes and the area which is in the low troposphere of convectiveinstability when MPV1 is less than 0 and has a larger growth about absolute value of MPV2.The changingrange and intensity of the mesoscale convective cloud cluster has important indicating significance in heavyrainstorm development.
出处
《中国农学通报》
2015年第5期199-207,共9页
Chinese Agricultural Science Bulletin
基金
山东省气象局课题"影响山东的台风特征分析与典型疑难个例研究"(2014sdqxm14)
"山东暴雨落区的分类分析与预报技术研究"(2012sdqxz04)
山东省气象局预报员专项(sdyby2012-07)
关键词
局地大暴雨
湿位涡
地形作用
TBB资料
中尺度分析
local heavy rainstorm
moist potential vorticity
terrain effect
TBB
mesoscale analysis
