一次强对流风暴含水量的雷达反演和数值模拟结果的对比分析

Comparison Analyses on the Radar Retrieved and Simulated Water Content in a Severe Converctive Storm

利用多普勒天气雷达探测的反射率因子Z与含水量M的Z-M经验关系式,反演含水量,并构建等高平面位置显示CAPPI和垂直剖面VCS两种显示方式。计算域定为以雷达站为中心的,水平边长为150 km,垂直高度为30 km的长方体箱区,分辨率是1 km×1 km×1 km。同时应用中国科学院大气物理研究所建立的完全弹性三维雹云数值模式(IAP-CSM3D),以2004年4月23日发生在湖南省境内的一次强对流风暴过程为例,模拟该风暴云体的含水量分布。雷达反演含水量和数值模拟结果的对比分析表明,不论在风暴的发展阶段还是在强盛阶段,反演得到的含水量等值线分布和模式输出总体相似,风暴中心的强度和高度位置吻合得很好,较好地反映了该风暴云的结构,反演效果较好。

The fully elastic three-dimensional convective storm model（IAP-CSM3D） established by the Institute of Atmospheric Physics（IAP）,Chinese Academy of Science was used to simulate severe convective storm that occurred in Hunan province on April 23,2004.The reflectivity observed by the Doppler weather radar was used to retrieve the water content,and established two display modes,which are CAPPI and VCS.Calculation field is defined as the cuboid grid box centered by the radar station,with the horizontal lateral lengths of 150 km,with the heights of 30 km,and with the resolution of 1 km×1 km×1 km.To retrieve the case water content in comparison with the water content from the numerical modeling.The result is as follows： The constant value line distribution of the retrieved water content is parallel to the simulated output as a whole no matter in the development stage or in the strong stage of the storm,and the strength in the storm center as well as the height position is consistent well,that reflect the storm structure on the whole and the retrieve effect is rather perfect.