新疆昌吉州一次暴雨过程的诊断分析

Diagnostic Analysis of a Rainstorm in Changji of Xinjiang

摘要: 本文利用常规高空地面气象观测资料、自动站逐时降水资料及NCEP/NCAR 1˚ × 1˚逐6 h再分析资料，对2015年6月9~10日发生在昌吉州的暴雨天气成因进行了天气学诊断分析。结果表明：此次暴雨天气是在100 hPa南亚高压呈双体型、500 hPa低纬的短波影响下形成的；沿天山两侧的强东西风切变形成了系统性的上升运动，辐合上升运动促使暴雨强度增大；暴雨大值区与低层辐合、高层辐散的正涡度中心相对应；来自低槽自身携带的水汽，通过中低层的偏西气流输送到暴雨区。

Abstract: We used the conventional surface observation data, upper-air sounding meteorological data, hourly precipitation data from AWS and the NCEP/NCAR reanalysis dataset to analyze a rainstorm in Changji during 9th-10th June, 2015. The results showed that: the circulation background of the rainstorm displayed a two-body pattern of South Asia high and the influence of the low latitudes in shortwave. The systematic ascending motion in the both sides of the Tianshan Mountains was formed by strong east and west wind shear, and convergence ascending motion prompted rains-torm intensity increased; the heavy rain corresponded to the vorticity center of low-level conver-gence and high-level divergence, and the water vapor from the low trough, transported to the rainstorm area by westerly low levels.