摘要
利用常规探测资料、多普勒雷达资料和1°×1°NCEP 再分析资料，对2010年6月17日发生的一次短时强降水天气进行了分析和诊断。这次降水属于典型的低涡前部暴雨形势，强烈的垂直风切变和 SWEAT 指数对降水有很好的指示意义；低层偏东风的嵌入时间和发展强度、高度都与强降水的开始、发展和结束具有很好的相互联系；不同于区域暴雨的水汽形势，强对流天气中的相对湿度并不很大，降水发生期间的相对湿度仅在50-6%左右；水汽辐合带以及能量锋区均位于天津的西南侧，和低涡槽前对应，造成这次短时强降水。
Analysis and diagnose of a Short -time Heavy Rain in Tianjin on June 1 7,201 0 is performed by using the routine observational data and NECP/NCAR 1 °×1 °reanalysis data.The results show as the following：Firstly,the precipitation is typical rainstorm situation of vortex front,strong vertical wind shear and SWEAT index are good indication of precipitation.Secondly,the embedding time ,intensity and the developing height of the low-level easterly winds are closely connected with the beginning,development and end of heavy precipitation. Thirdly,the relative humidity is different from the situation of the regional rainstorm water vapor,which is just 50-60% during the rain.Finally,moisture convergence and energy front are located in the northeast of Tianjin, which is the trigger of the short -time heavy rainfall.
出处
《山东师范大学学报（自然科学版）》
CAS
2014年第1期110-113,119,共5页
Journal of Shandong Normal University(Natural Science)
关键词
强对流
低层东风
中尺度
strong convection
low -level easterly winds
mesoscale
