Comparative Analysis of Two Heavy Snow Processes Based on Doppler Radar Radial Velocity

• 作者: Du Meiling Li Laping Qin Yajuan Yang Hai Yang Shuhua Zhang Yufang
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: 径向速度 多普勒天气雷达 大雪 多普勒雷达资料 零速度曲线 表面电流 低空急流 定量分析
• 年，卷（期）: 2014,（7）
• 页码范围: 12-16
• 页数: 5页
• 分类号: P457.6

摘要

By using the data of synoptic charts and Datong Doppler radar data,two heavy snow processes in Datong during November 9-10,2009 and on March 14,2010 were analyzed. The results show that surface current,occluded fronts,high-altitude and low-altitude jet stream were main reasons for the heavy snow processes. Zero velocity curves were like " S" at elevations of 0. 5,1. 5 and 2. 4°,and there were a pair of " bull’s-eye" structure,showing that heavy snow would occur. As for the two heavy snow processes,the qualitative judgment results based on the area of positive and negative velocity zones were consistent with the quantitative analysis results based on the average divergence well,so we can use radar images to judge features of velocity fields rapidly in practice.