山东一次局地暴雨的中尺度风场特征

The Mesoscale Wind Structures of Local Heavy Rainfall in Shandong Province

利用山东济南及滨州多普勒雷达体扫资料,结合NCEP/NCAR(1°×1°)再分析资料及地面自动站观测资料,对2007年6月29日鲁中地区的一次局地暴雨过程进行分析,结果表明:本次局地暴雨为对流性降水,该过程风场水平和垂直结构与回波强度及其演变存在较好的对应关系,中低层存在明显的中尺度切变线,垂直方向上,暴雨系统存在明显的上升气流,二者是产生暴雨的重要条件;中低层辐合线造成水汽集中,为强回波带的形成提供水汽和动力条件;强回波带上的上升气流将水平输送到局地的水汽向上输送,有利于系统进一步发展。

Using Doppler radar,AWS observation data and NCEP/NCAR（1？×1？） reanalysis data,a local heavy rain happened in Middle Shandong Province was analyzed.Some results are the following：（1） The local heavy rain was convective precipitation.During the rain process,horizontal and vertical wind structure of the wind field had a better corresponding relationship with echo intensity and its evolution.There were mesoscale shear line in low-middle level and updraft vertically in the heavy rain weather system,and these two were the important factors to produce heavy rain.（2） Vertical flow caused by low-middle level convergence lines provided water and power conditions for strong echo.Once more,strong rising air brought water vapor upward from advection,which promoted the further development of heavy rain system.