一次长寿命风暴的CINRAD／SA雷达反射率及中气旋产品特征与流场结构分析

The Air Flow Structure and Characteristic of CINRAD-Products in a Long-Life Storm

利用济南观测站的探空、涡度、地面资料和CINRAD／SA雷达产品，对2004年6月24日发生在山东西部地区的强风暴过程进行了分析。结果表明，风暴低层存在中尺度辐合现象，风暴前侧的人流依靠后部低层冷空气池的向前推进而得到支撑，产生逆环境风切变方向的主上升气流区；中层为双涡旋结构，这种深厚的内部涡旋结构可与环境风相持，形成近似刚体的风暴柱，环境风绕风暴而过，不会吹穿风暴，有利于风暴长时间维持；风暴成熟阶段表现为超级单体结构特征并伴有中气旋；三体散射（TBSS）出现在中高层，TBSS出现10～15min后地面出现大冰雹，TBSS消失后维持10～20min的降雹。

Using the sounding data, vorticity, surface temperature, wind vector and Jinan--CINRAD/ SA products such as reflectivity, base velocity, mesocyclone and VIL in a long-life severe hailstorm in west Shandong Province on 24 June 2004, the storm structure was analysed. The results show that there was cyclonic-convergence at low level. The updraft was sustained by a strong cold air pool near the surface in the back of storm, an upshear tilting main-updraft was built in the front of storm. The double-vortex flow pattern, which can resist the environmental airflow, was built form mid to mid-high levels. The storm was hard to be blown away by environmental airflow, and persisted long time. The storm had the characteristics of supercell storm, and accompanied with mesocyclones. The ＂Three-Body Scatter Spike＂- TBSS was detected at mid-high levels of the storm, and it preceded the largest surface hailfall by 10b 15 minutes. Hailfall lasted 10-20 minutes after the disappearance of the TBSS.