一次早春多单体冰雹分析

利用常规气象资料、NCEP再分析资料,结合黄山多普勒雷达观测资料,对2009年2月发生在黄山地区一次冰雹天气个例发生发展过程进行分析。结果显示:①此次降雹是由于高空急流引发的,有一次积云合并过程,具有多雷暴单体的基本特征。②冰雹发生在早春2月,具有明显的季节特征,组合反射率也很高,但由于空气柱气温较低,垂直液态水含量相比初夏的冰雹要小,-20℃高度相比初夏低1～2km。

Case Study of Multi Cell Hailstorm in Early Spring

Using the conventional meteorological data, the NCEP reanalyzed data, in combination with Huangshan Doppler radar observational data, the hailstorm occurred in February 2009 in the Huangshan Mountain area is studied. The results indicate： （1） The hailstorm, having the feature of multiple convective cells, was induced by an upper-level jet and a merging process of cumulus clouds. （2） The hailstorms occurring in early in spring have common features of hailstorms, and also have obvious seasonal feature： the combination emissivity is also very high, but because the column temperature is relatively low, compared with early summer hailstorms, the vertical liquid water content is smaller, and the height of -20 ℃ was 1 to 2 kilometers lower.