裕民阿克乔克草原一次暴雨天气雷达回波特征分析

Analysis of Radar Echo Characteristics of a Rainstorm on Akjock Grassland in Yumin County

本文利用X波段多普勒天气雷达的基本反射率图、径向速度图等相关资料,对6月6日裕民县阿克乔克草原的暴雨天气过程进行了综合分析,并总结了暴雨过程的雷达回波特征。结果表明:中亚低值系统是造成此次暴雨天气的主要影响系统。源源不断的水汽从西南方向不断向塔城地区输送,并在此区域辐合造成此次暴雨过程出现时间短、雨强大,时段集中。低层正涡度区、上升运动、层结不稳定等因素为暴雨的产生创造了热力、动力和能量条件。此次暴雨过程的触发机制是低层中尺度风速切变、西南暖湿气流的增强,以及低层辐合、高层辐散的大气上下抽吸作用。

In this paper, the basic reflectivity chart and radial velocity chart of x-band Doppler weather radar are used to comprehensively analyze the rainstorm weather process in Akjok grassland of Yumin County on June 6, and the radar echo characteristics of the rainstorm process are summarized. The results show that the central Asian low-value system is the main influence system of the rainstorm. The continuous water vapor from the southwest to the Tacheng area, and convergence in this area caused the rainstorm process of short time, strong rain, concentrated time. The factors such as low level positive vorticity region, rising motion and stratigraphic instability create thermal, dynamic and energy conditions for rainstorm. The triggering mechanism of the rainstorm process is the mesoscale wind shear in the lower layer, the enhancement of the southwest warm and humid air-flow, and the suction of the atmosphere with convergence in the lower layer and divergence in the upper layer.