重庆一次暴雨过程的雷达产品特征分析

Analysis of Radar Product About a Heavy Rain Process in Chongqing

利用重庆万州CINRAD／SB雷达产品对2010年7月8—10日发生在重庆东北部的暴雨过程进行了分析。结果表明：（1）此次过程主要以局地的对流性降水为主，降水回波在原地发展滞留时间较长，造成单点降水强度较大。回波相互合并，意味着能量的集中和辐合上升运动的增强，所以回波单体合并会导致单体呈现增强趋势；（2）降水过程中逆风区与邻近风场构成了强烈的辐合上升运动，影响水平辐合辐散的强弱和分布，有利于低层水汽的向上传输和降水粒子的降落；（3）从风暴移动情况来看，风暴均具有稳定少动、强度较强的特点，且消亡与生成时间相衔接，同一时间内无2个风暴并存现象。另外，风暴跟踪信息产品（STI）对风暴生成和消亡时的路径预测准确率不高，而成熟阶段的预报与实况吻合度相对较高。

Based on radar product data, a heavy rain process in the northeast of Chongqing on 8 July 2010 was analyzed. The results are as follows ： （ 1 ） The weather process mainly caused by local convection precipitation echo, which stayed for a long time and led to high intensitive single - point precipitation. The echos merged and that meant energy concentration and enhancement of convergence upward movement, so when single echo merged with others, it would show an increasing trend. （2） The upwind area and adjacent wind field formed strong convergence ascending motion during rainfall process, which influenced the intensity and distribution of horizontal convergence and divergence, and it was benefit to water vapor transport upward and the landing of precipitation particles. （3） From the storm motion, the storms had the characteristics of stability and strong intensity, and the dying time connected with generation time, and two storms didn＇t coexist at the same time. In addition, the storm tracking information products （STI） had no high accuracy for storm path forecast at the stage of generation and dying time, but at the mature stage, forecast results coincided with the actual highly.