摘要
该文利用常规气象降水观测资料和NCAR提供的1°×1°的FNL再分析资料,对贵州2018年6月20—24日大范围持续性降水天气过程进行分析,结果表明:100 hPa受南亚高压影响,贵州处在高压前部的高层辐散、低层辐合气流中,有利于产生上升运动。500 hPa亚欧大陆稳定的两槽一脊环流形势,导致北方弱冷空气从贝加尔湖高压脊前不断南下至长江流域。850 hPa主要受低空急流和切变线的影响,低空急流将西南暖湿气流源源不断地输送到中国南方;切变线稳定位于浙江中部至贵州北部,同时贵州的水汽通量辐合区位于切变线南侧,利于水汽辐合上升。贵州全省处在低层辐合、高层辐散的垂直运动负值区中,有良好的上升运动条件。水汽和动力条件的配合,是造成此次贵州大范围的持续性降水天气的主要原因。
The conventional meteorological precipitation observation data and 1°×1°FNL reanalysis data provided by NCAR were used to analyze the process of large-scale continuous precipitation from June 20 to 24,2018 in Guizhou.The results show that:100 hPa was affected by the south Asian high,and Guizhou was in the high-level divergence and low-level convergence airflow in the front of the high,which was conducive to the upward movement.The stable circulation situation of two trough and one ridge in Eurasia at 500 hPa causes weak cold air in the north to move southward from the high pressure ridge of Lake Baikal to the Yangtze river basin.The 850 hPa is mainly affected by the low level jet stream and the shear line,which continuously delivers the warm and humid air from the southwest to the south of China.The shear line is located stably from central zhejiang to northern Guizhou,and the convergence zone of moisture flux in Guizhou is located to the south of the shear line,which is conducive to the rise of moisture convergence.Guizhou province is located in the negative area of vertical motion of convergence at the lower level and divergence at the higher level,and has good upward motion conditions.The combination of water vapor and dynamic conditions is the main reason for the continuous precipitation inGuizhou.
作者
谢智沛
吴曲琳
闵怡
莫新梅
刘飞
XIE Zhipei;WU Qulin;MIN Yi;MO Xinmei;LIU Fei(The Meteorological Bureau of Huishui County,Guizhou Province,Huishui 550600,China)
出处
《中低纬山地气象》
2020年第1期49-53,共5页
Mid-low Latitude Mountain Meteorology
关键词
环流形势
切变线
动力条件
持续性降水
circulation situation
shear line
dynamic conditions
persistent precipitation
