摘要
应用常规天气图资料、地面加密降水观测资料、探空资料及美国NCEP/NCAR再分析资料,对2010年7月19日山东飑线过程和2011年7月26日河北飑线过程进行了对比分析。结果表明,两次过程的相同点为:两次过程均位于500 hPa高空槽前;两次飑线过程均产生了雷雨大风和短时强降水天气;湿层均较深厚;下沉有效位能均较大。不同点为:2010年7月19日山东飑线过程属于有明显垂直风切变环境中的飑线;对流不稳定能量相对较低。而2011年7月26日河北飑线过程属于风垂直切变相对小的环境中的飑线;对流不稳定能量很大;除了雷雨大风和短时强降水天气之外还产生了冰雹。
Based on the conventional surface and upper observation data, densified observation of precipitation data, sounding data and NCEP reanalysis data, the two squall lines which occurred on the July 19, 2010 and July 26, 2011 were analyzed. The results are as follows. The same characteristics are： The two squall lines both occurred ahead of the 500 hPa trough, and accompanied by high speed winds and short-duration heavy rain, The wet layers were both deep, DCAPE were large in the two processes. The differences are that the squall lines occurred oil July 19, 2010 had obviously vertical wind shear, and CAPE was relatively low. The squall lines occurred on July 26, 2011 had small vertical wind shear. The convective unstable energy was very large. Besides the high speed wind and short-duration heavy rain, the squall line produced the hail as well.
出处
《沙漠与绿洲气象》
2012年第5期25-29,共5页
Desert and Oasis Meteorology
基金
国家自然科学基金项目(41105026)
中国气象局预报员专项(CMAYBY2011-061)共同资助
关键词
飑线
垂直风切变
强对流
雷雨大风
冰雹
短时强降水
squall line
vertical wind shear
severe convection
high speed wind
hail
short-durationheavy rain
