| 摘要: |
| 本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：100hPa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。500hPa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。850hPa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。 |
| 关键词: 环流形势;切变线;动力条件；持续性降水；贵州 |
| DOI： |
| 投稿时间：2019-06-12修订日期：2019-10-29 |
| 基金项目: |
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| The Analysis of a Continuous Precipitation Process in Guizhou Province during“2018.06” |
| Xie Zhipei,Wu Qulin,Min Yi,Mo Xinmei,Liu Fei |
| (Huishui Meterorological Bureau) |
| Abstract: |
| In this paper, FNL 1°×1°reanalysis data from NCAR and conventional meteorological data were used to analyze the Precipitation Process in Guizhou Province from June 20 to 24, 2018, the results show that Guizhou is located in the high-level divergence and low-level convergence airflow at the front of the 100hPa South Asia High,it is conducive to the rise of movement. In the 500hPa, the stable circulation of two-trough-one-ridge in eurasia makes the northern cold air from the high ridge of Baikal continuously southward to the Yangtze River basin.850hPa is mainly affected by low-level jets and shear lines, The low-level jet continuously transported southwestern warm and humid air to the Southern China;The shear line is Stable from the middle of Zhejiang to the northern part of Guizhou, meanwhile the water vapor flux convergence zone in Guizhou is located on the south side of the shear line, which is conducive to the rise of water vapor convergence. Guizhou province is in the vertical motion negative zone of high-level divergence and low-level convergence,which has good ascending motion conditions. The combination of water vapor and dynamic conditions are the main reason contributing to the large-scale continuous precipitation weather in Guizhou. |
| Key words: Circulation situation;Shear line;Dynamic condition; Continuous precipitation;Guizhou |
