Q矢量理论在青藏高原东侧大暴雨过程中的诊断应用

利用常规探空和地面观测资料．对2002年6月8～9日发生在青藏高原东侧川陕地区的一次罕见大暴雨过程的环流特征及成因作了诊断分析。再利用MM4模式所提供的高时空分辨率资料．应用湿Q矢晕理论对暴雨过程进一步进行了中尺度诊断研究。结果表明，湿Q矢量散度场的分布反映了次级环流的方向和强弱，暴雨出现在中尺度环流明显增强时。湿Q矢量分解揭示了该次暴雨过程的中尺度特性。

Application of Q-Vector Theory to "02.6" Heavy Storm Rain on the East Side of Qinghai- Xizang Plateau

By using the routine sounding and surface observation data, the circulation features and physical causes for the heavy storm rain process occurred in Shaanxi on the east side of Qinghai-Xizang Plateau on 8~9 June 2002 were diagnosed and analyzed. Furthermore, based on MM4 model output production, a mesoscale analysis was made according to %Q%-vector theory. The results show that the distribution of wet %Q%-vector indicates the direction and intensity of the secondary circulation. The heavy storm rain may occur when the mesoscale circulation enhanced. The partition of wet Q-vector indicates mesoscale feature in the heavy storm rain.