阿克苏初秋一次暴雨过程诊断分析

本文利用常规地面与高空观测资料、自动站逐时资料、NECP1°×1°再分析资料,对阿克苏地区2015年9月7日局地暴雨进行分析。结果表明,造成此次暴雨的主要原因有(1)中尺度分析暴雨发生前阿克苏处于高能高湿不稳定区域；(2)08时至20时探空图中湿层、风向以及不稳定能量的突变预示了强对流天气的发生；(3)暴雨过程的大部分水汽是通过低层偏东气流输送,水汽的来源主要为孟加拉湾,其次北疆短波槽及蒙古槽也提供了少量水汽(4)锋区加强、垂直风切变增大、水平风速辐合提供了热力及动力条件,垂直速度伸展高度影响了对流云厚度及高度。(5)地面风速辐合触发对流,加之较好的地面热力条件以及一定的地形增益暴雨强度。(6)地面辐合线及偏东风输送位置影响暴雨落区。

Causation Analysis of Early Autumn Rare Rainstorm in Northern basin Akesu

In this paper, the use of conventional ground and aerial observations, data, NECP1 ° × 1 ° reanalysis data by automatic station on September 7 Aksu Prefecture of storm analysis. The results showed that the main cause of this storm are (1) Prior to analysis of mesoscale heavy rainfall in Aksu Energy humidity unstable region; (2) 08 Pm to 20:00 sounding figure wet layer, wind direction and unstable energy mutation Predicts the occurrence of severe convective weather; most of the moisture (3) rainstorm by the low-level easterly winds transport, source of water vapor is mainly the Bay of Bengal, followed by East Asia and northern shortwave trough grooves also Provide a small amount of water vapor (4) frontal zone strengthened increased vertical wind shear, horizontal wind convergence Provides thermal and Power conditions, vertical speed stretching highly influenced by the cloud thickness and height. (5) wind speed convergence trigger convection, combined with good ground thermal conditions and gain some terrain storm strength.(6)The surface convergence line and easterly transport position influence rainstorm area.