【作者】 胡文东； 丁建军； 刘建军； 王惠琴；

【Author】 HU Wen-dong1 DING Jian-jun1 LIU Jian-jun1 WANG Hui-qin2 (1Key laboratory of Preventing and Reducing Meteorological Disaster of Ningxia, 2Yinchuan Meteorological Bureau, Yinchuan, China, 750002)

【机构】 宁夏气象防灾减灾重点实验室； 银川市气象局；

【摘要】 本文针对发生于2002年8月13到14日的宁夏一次强降水过程,进行了降水场时空特征分析、中尺度天气学成因分析,并利用宁夏精细化预报系统的物理量场,即中尺度非静力平衡数值预报模式MM5逐小时高时空分辨率导出产品,进行了高强度降水时段的合成分析。结果表明:本次过程的降水量时间与空间分布具有很大的不均匀性,大形势场内的中尺度涡旋导致了降水过程的产生,涡旋内中小尺度冷空气活动,与地形强迫引起的上升运动相配合,造成了山麓迎风面的短时强降水。宁夏精细化预报系统的物理量产品对这一过程的细节变化具有较好的描述能力,具有较明确的预报指示意义。更多还原

【Abstract】 The temporal and spatial distribution of precipitation, mesoscale synoptic system, and diagnosis fields of helicity and potential vorticity in high resolution were analyzed in this paper on a heavy rainfall event on August 13 and 14,2002. Results show that: 1. Precipitation during this event is very asymmetry both in time and space. 2. Mesoscale vortex in the macro environment was the effecting system of the rainfall and, the activity of meso and sub_meso scale cold mass, cooperated with ascending movement induced by topography forcing, was the reason of torrential rainfall in the windward area in Mt. Helan and Mt. Liupan. 3. Helicity and potential vorticity were capable to describe the features of rainfall in detail, and they were meaningful for forecast.更多还原