湘中一次大暴雨过程的中尺度特征分析

利用地面中尺度自动气象站逐时站点气象资料、多普勒雷达产品等多种加密探测资料,对2010年6月23～24日主要发生在湖南湘中地区的大暴雨过程进行中尺度分析。研究表明,此次大暴雨过程开始发生在副高边缘旺盛的西南暖湿急流下,中后期偏东急流的增强促使了辐合带在湘中长时间的维持,造成了湘中的大暴雨带;地面中尺度辐合线的变化能较好地反映出强降水的移动变化趋势,并对强降水的维持时间和落区有很好的指示性;湖南复杂地形在暴雨启动机制中起重要作用。

Analysis of Mesoscale Characteristics Hunan Heavy Rain

Use of automatic weather station surface mesoscale meteorological data of hourly site,Doppler radar map products and other exploration data encryption on the June 2010 23-24,mainly in the area in Hunan heavy rainfall process in the scale analysis,research show: the heavy rainfall began booming in the southwestern edge of the subtropical high warm jet,and the jet stream in the east later enhanced to promote the convergence zone in Hunan in the maintenance for a long time,resulting in heavy rain with Hunan;ground in changes in scale convergence line hard enough to indicate the movement of heavy precipitation trends,and the maintenance of heavy rainfall has a good time and area of the indicative;Hunan complex terrain in the rain starts to play an important role in the mechanism.