基于CINRAD/CA雷达的2次强天气对比分析

为了研究不同类型强对流天气在多普勒雷达产品中的表现特征,利用山西北部大同地区CINRAD/CB波段多普勒雷达,对2012年7月5日广灵县冰雹和2011年7月21日左云县短时强降水对比分析.结果表明：（1）冰雹天气低层逆温层较厚,短时暴雨逆温层浅薄;（2）冰雹天气强回波区所在高度在-20℃等温线之上,短时暴雨在0℃层等温线以下;（3）冰雹天气65～60 dBz回波所在高度超过短时暴雨4～5 km左右;（4）冰雹天气低层有弱回波区、中高层有悬垂回波;（5）中气旋、中尺度辐合区及风暴顶辐散是冰雹天气的特征,深厚的湿层及急流长时间维持是短时暴雨特征;（6）冰雹天气低层风向顺转中层逆转高层顺转,短时暴雨风向整层顺转;（7）降雹过程有持续高VIL值及对应大的梯度变化值,而短时暴雨VIL跃升量很小.

Analysis of Two Strong Weather Processes Based on CINRAD/CA Radar

In order to study the features of the different types of severe convective weather on Doppler radar products,based on CINRAD/CB radar data in Datong,a hailstorm weather process occurring in Guangling on July 5,2012 and a short-time rainstorm weather process occurring in Zuoyun on July 21,2011 were analyzed comparatively.The results showed that：（1） inversion layer was thick in the hailstorm weather and was shallow in the short- time rainstorm weather.（2） The height of strong echo area was on the- 20℃ isotherm in the hailstorm weather and was under 0℃ isotherm in the short-time rainstorm weather.（3） The height of 65-60 d Bz echo in the hailstorm weather was 4-5 km higher than in the short-time rainstorm weather.（4） There were weak echo area on low level and overhang echo on middle- high level in the hailstorm weather.（5）Mesocyclone,mesoscale convergence and divergence of the storm top were the main characteristics in the hailstorm weather,while deep moist layer and jet maintained for a long time were the main characteristics in the short-time rainstorm weather.（6） The wind direction was clockwise on low layer and was counterclockwise on middle layer and was clockwise on high layer in the hailstorm weather,while the wind direction on all layers was clockwise in the short-time rainstorm weather.（7） There were sustainable high value of VIL and a corresponding gradient changes value in the hailstorm weather,while the VIL jumped by small amount of data in the short-time rainstorm weather.