2013年夏季东北地区的一次暴雨过程分析

Analysis of a Rainstorm Process in Northeast China in the Summer of 2013

本文利用micaps资料和NCEP再分析资料等,对2013年8月14—17日东北地区的一次暴雨过程进行分析。结果表明,本次暴雨过程是由低涡和副热带高压共同作用造成的,低槽不断向东移动,经过东北地区,并配合强盛的高低空急流与低层切变线等系统,为东北地区中南部带来持续降水。本次暴雨过程的水汽主要来自西太平洋和南海,由副高外围气流及西南低空急流输送到东北地区。暴雨中心位于低层辐合与高层辐散交汇区,垂直上升运动明显。

This paper used micaps data and NCEP reanalysis data to analyze the process of a rainstorm in Northeast China from August 14-17,2013.The results showed that this rainstorm process was caused by the combined action of low vortex and subtropical high,the low trough continued to move eastward,passing through the northeast region,and in conjunction with the strong high-low-level jet stream and low-level shear line systems,bringing continuous precipitation to the central and southern parts of the northeast region.The water vapor in the rainstorm process mainly came from the western Pacific and the South China Sea,and was transported to the northeastern region by the airflow outside the subtropical high and the low-level jet stream in the southwest.The center of the rainstorm was located at the intersection of the low-level convergence and the high-level divergence,and the vertical upward movement was obvious.