摘要
利用常规观测资料、区域自动站及NCEP再分析等资料,对2013年5月24—25日(简称"5.24"暴雨)和6月8—9日(简称"6.8"暴雨)两次暴雨天气过程进行对比分析。结果表明:两次暴雨都是在高空槽东移引导冷空气南下、低涡切变等有利的环境背景下产生的,水汽主要来自孟加拉湾及南海的西南暖湿气流。两次暴雨过程都发生在"西低东高"的形势下,"5.24"暴雨中高纬度以纬向环流为主,冷空气较弱,副高偏强,低涡移动发展缓慢;"6.8"暴雨中高纬为宽广的槽区,冷空气强,有利于低涡的发展和快速移动,副高较弱。两次暴雨过程发生前贵州西南部地面均受热低压控制。"5.24"上升气流伸展高度相对较低,大的垂直上升速度范围较广;"6.8"暴雨上升气流伸展高度高,大的垂直上升速度范围相对较小,与暴雨落区也有很好的对应。
Conventional observation data,the regional automatic station data and NCEP reanalysis data were utilized to make comparative analysis between two rainstorm process occurred from May 24 to 25,2013（ referred to as the ＂ 5. 24＂ rainstorm） and from June 8 to 9,2013（ referred to as the ＂ 6. 9＂ rainstorm）. The results show that the two rainstorms occurred with the cold air in the upper trough,low vortex and shear. The vapor is mainly from Bay of Bengal and the South China Sea. They happened on the high pressure in the east and low pressure in the west.When ＂ 5. 24＂ rainstorm occurred,the latitude circulation is mainly in high latitude zonal,Cold air is weaker,the subtropical high is strong and vortex moving development is slow. There are a wider range,strong cold air and the weaker subtropical high on ＂ 6. 8＂ rainstorm,which are conducive to develop and move of the vortex. Before two rainstorm processes occurred,the ground is controlled by heating and low pressure in the southwest of Guizhou.The stretching height of updraft flow is relatively lower,but the vertical velocity range is wider at ＂ 5. 24 ＂ rainstorm. The stretching height of updraft flow is relatively higher,the range of large vertical velocity is small and are consistent with falling area of the two rainstorm.
出处
《贵州气象》
2016年第1期7-11,共5页
Journal of Guizhou Meteorology
基金
贵州省气象科技开放基金"贵州省大风特征及其天气学概念模型研究"[黔气科合KF(2016)15号]
贵州省气象科技开放基金"L波段探空资料在贵州中尺度数值模式中的敏感性试验"
关键词
暴雨过程
环流特征
对比分析
rainstorm process
circulation characteristics
comparative analysis
