2016年5月桂北地区一次对流性暴雨过程诊断分析-气象研究与应用

文章信息/Info

Title:: Diagnostic analysis of a Convective Rainstorm Process in North of Guangxi in May 2016

Author(s):: QIN Jing; PAN Hai; SU Xiaoling; Liuzhou Municipal Meteorological Service, Liuzhou 545001

Keywords:: North of Guangxi; Convective rainstorm; Vertical helicity; "Train effect"

摘要:: 利用常规观测资料、中尺度自动站资料、NCEP1°×1°再分析资料和雷达回波资料,对2016年5月19-20日发生在桂北地区的对流性暴雨过程进行了诊断分析。结果表明:这次暴雨过程是受高空槽前西南气流控制,冷空气侵入地面倒槽,由地面辐合线触发对流而引起的。高空急流提供了很好的辐散条件,有利于上升运动的维持和发展。925hPa水汽辐合中心和850hPa垂直螺旋度大值区与暴雨中心有很好的对应关系。中-α尺度低空急流的脉动可以激发对流云生成、使降水增幅。在雷达回波图上表现为回波合并和低质心、高效率的"列车效应"。

Abstract:: Based on the conventional observation data, automatic weather station data, NCEP1°×1°reanalysis data and Doppler radar products, the convective rainstorm occurred in north of Guangxi in May 2016 was analyzed. The results showed that this rainfall event was caused by the southwesterly current in the front of the high level trough, cold air, and surface convergence line. The high-level jet provides a good divergence condition, which is conducive to the maintenance and development of ascending motion. There was a good corresponding relationship between 925hPa water vapor convergence center and 850hPa vertical helicity large value area and rainstorm center. The α-mesoscale low-level jets can stimulate the formation of convective clouds and increase precipitation. The radar echo map shows echo merging and low mass center and high efficiency "train effect".