摘要
利用常规观测数据、自动站资料、NCEP 1°×1°再分析资料和多普勒雷达资料等,对2015年5月20日河源出现的局地性强、持续时间短、降水强度大的大暴雨过程的环流特征、影响系统及物理量场等进行分析。结果表明,该次过程是一次锋面低槽造成的强降水,来自孟加拉湾的西南气流为暴雨区提供充足的水汽输送,位势不稳定层结、高降水效率、负变温往南前倾、垂直速度强上升区范围小、列车效应及强烈的西南风和西北风辐合是产生强降水的重要原因,大暴雨主要出现在垂直速度上升区和不稳定能量大值区相配合的区域。
With the data of conventional observation, automatic weather stations, NCEP 1°×1° reanalysis and Doppler radars, we studied the circulation characteristics, affecting systems and physical quantities fields of a heavy rain that marked with high locality, short duration and large rain rate in Heyuan on May 20, 2015. The result is as follows. The process of interest was an intense rain that was caused by a frontal low pressure into which a southwesterly airflow from the Bay of Bengal transmitted sufficient amount of water vapor. Besides, instable geopotential stratification, high raining efficiencies, southward-inclining areas of negative temperature variation, small areas of intense ascending vertical velocity, the ＂train＂ effect and strong convergence between the southwesterly and northwesterly are also important for the intense rain. The unusually heavy rain occurred in the area where the ascending vertical velocity was allocated with large instability energy.
作者
贺发胜
曹刚
甘海
陈锐
单雪珂
HE Fa-sheng CAO Gang GAN Hai CHEN Rui CHAN Xue-ke(Meteorological Bureau of Heyuan City, Heyuan 517000)
出处
《广东气象》
2016年第5期15-19,共5页
Guangdong Meteorology
关键词
天气学
大暴雨
锋面低槽
暴雨落区
河源市
synoptics
unusually heavy rain
frontal low pressure
area of heavy rain
Heyuan City
