Journal of Arid Meteorology

Previous Articles     Next Articles

Analysis of Radial Velocity Features of Doppler Radar on a Torrential Rainstorm in Eastern Fanjing Mountain in Late Spring of 2015

  

  1. Jiangkou Meteorological Station of Guizhou Province, Jiangkou 554400, China
  • Online:2016-12-30 Published:2016-12-30

2015年春末梵净山东侧特大暴雨雷达径向速度特征

  

  1. 贵州省江口县气象局,贵州 江口 554400
  • 作者简介:方标(1987- ),男,工程师,本科,主要从事多普勒雷达产品分析工作. E-mail:trqxfangbiao@sina.com
  • 基金资助:

    黔科合\[2016\]支撑2813“基于多普勒雷达速度产品的梵净山区域短时强降水预报预警技术研究”、铜市科研(2016)1号“基于多普勒雷达的梵净山区域短时强降水预报预警技术研究”、黔气科合QN\[2017\]01号“基于雷达回波反射率垂直剖面图的冰雹识别研究”及铜气科合\[2016\]01号“基于实测降水强度下的铜仁市暴雨Z—R关系研究”共同资助

Abstract:

Based on the reflectivity and radial velocity data of new generation Doppler radar with C band at Tongren station of Guizhou Province and the hourly precipitation data of 369 automatic weather stations in Tongren region, the evolution characteristics of the echo, radial velocity and wind profile of a torrential rainstorm occurred in eastern Fanjing mountain on 14 May 2015 were analyzed. The results showed that the strong echo stabilized and gathered in Fanjing mountain, which caused the short-time strong rainfall. The characteristics of wind field in VWP (velocity of the wind profile) diagram were significantly different at different stages of the rainfall. There was a ND area with wedge shape in VWP diagram before the rainfall, the strong wind area appeared in middle to upper levels of troposphere, and its bottom height reduced quickly as time goes on. During the development of rainfall, the warm advection below 8 km and cold advection above 8 km formed the atmospheric unstable stratification, and the wind speed increased with the rise of height in lower layer, the wind vertical shear and disturbance were obvious. When the area with ND appeared in middle level of troposphere once again, and developed to upward and downward respectively, which indicated the rainfall would end. The meso-cyclone was conducive to the occurrence and development of short-term heavy rainfall. The PPI diagram appeared the head wind area at different level, which was indicative to the short-term heavy rainfall, and the continuous upwind area would predict to continue for some time of the short-term heavy rainfall.

Key words: torrential rainstorm, meso-cyclone, head wind area, VWP

摘要:

利用贵州铜仁新一代C波段多普勒天气雷达产品,对2015年5月14日夜间发生在梵净山东侧的特大暴雨天气过程中的雷达径向速度和速度二次产品VWP(速度方位显示风廓线)的演变特征进行分析研究。结果表明:强回波的稳定少动造成了此次短时强降水天气。VWP产品上,强降水发生前出现一楔形“ND”区域,在强降雨发生发展过程中大风区位置快速降低,而在强降雨即将结束时对流层中层出现“ND”区域且上下扰动发展。中气旋的出现有利于短时强降雨发生发展,不同高度层出现的逆风区是短时强降雨发生前兆,逆风区的持续预示短时强降雨仍将持续。

关键词: 特大暴雨, 中气旋, 逆风区, VWP

CLC Number: