2017年6月一次连续暴雨不同阶段对比分析  

Contrast analysis on different phases of a continuous torrential rain in June 2017

作　　者：欧徽宁 黄远盼 周渭 

机构地区：[1]贺州市气象局,广西贺州542899

出　　处：《气象研究与应用》2017年第3期49-52,60,共5页Journal of Meteorological Research and Application

摘　　要：为了解连续暴雨天气过程前后降雨差异,寻找连续暴雨预报着眼点,利用常规观测资料、物理量场资料及欧洲中心提供的每日2次粗网格数值预报资料,对2017年6月13日至16日广西连续暴雨天气过程进行分析,结果表明:连续性暴雨的大气环流背景为500h Pa中高纬地区深槽的稳定维持,引导北方冷空气不断补充南下影响广西,广西处于两大洋副热带高压的低槽区,200h Pa平均风场上南亚高压中心位置偏东,广西处于南亚高压东段分流强辐散区;第一、第二阶段的降雨属于弱环境风场下的暴雨天气过程,第三阶段降雨有急流建立,低层有低涡切变形成,地面冷锋也比第一、第二阶段强。通过物理量分析表明第三阶段降水的水汽、动力条件配置是最好的,最终导致出现降雨强度最大、面积最大的暴雨天气。Based on the conventional observation data, physical quantity field data and coarse grid numerical forecasting data of EC, the continuous torrential rain from June 13th to 16th, 2017 in Guangxi were analyzed. The results show that： atmospheric circulation background of torrential rain is the maintenance of the 500 hpa high-latitude deep groove, which leads to the north cold air replenishing south and affecting Guangxi, Guangxi is in subtropical high low trough area of two oceans, the position of South Asia high pressure center of 200 hpa mean wind field is toward east. Guangxi is in east shunt strong divergence area of the South Asia high voltage. First and second stage of the rain belong to heavy rain weather process under the weak environmental wind field, in the third stage of rain the jet has been set up, and on the lower layer low vortex shear is formed, surface cold front is stronger than that in the first and second stage. The physical quantity analysis indicates that the water vapor and dynamic condition of precipitation in the third stage are the best, which results in the rainstorm weather with the largest rainfall intensity and the largest area.

关 键 词：连续暴雨 差异分析 急流 物理量特征 

分 类 号：P458.121.2[天文地球—大气科学及气象学]