青海省都兰县一次大到暴雨过程分析
Analysis of a Heavy Rain Process in Dulan County, Qinghai Province
石秀云 1陈宏松 1刘成丰1
作者信息
- 1. 青海省格尔木市气象台,青海格尔木816099
- 折叠
摘要
利用常规资料、FY-2E气象卫星云图及各物理量场产品,从环流特征、物理量场特征、卫星云图特征等对都兰县2014年7月20-21日大到暴雨天气过程进行分析,探讨大到暴雨过程形成的可能原因.结果表明,此次降水天气主要受巴湖分裂短波槽携带冷空气自新疆东移南下与副热带高压外围西南暖湿气流共同影响;此次大到暴雨的水汽源地在孟加拉湾和南海,湿度场上形成了中下层湿、上千的不稳定层结;此次大到暴雨过程均有强烈的上升运动;大到暴雨发生前高空风向随高度顺转,为暖平流,较小的风切变有利于产生强降水;对流层中低层大气不稳定,为此次大到暴雨过程提供了不稳定的能量条件;大的降水一般出现在云系移动方向前方区的不稳定区内.
Abstract
Using the conventional data,FY-2E satellite images and the physical quantity fields,a heavy rain process in Dulan County during July 20-21,2014 was analyzed from circulation features,physical quantity field features and satellite cloud picture features,the causes were discussed.The results showed that the rainfall process were affected by cold air from Xinjiang and southwest warm air;the water vapor sources were in the bay of Bengal and the South China Sea,middle and lower layer wet,upper dry unstable stratification was formed on the humidity fields;the heavy rainfall had a strong upward movement;wind direction at hight altitude changed clockwise with height before heavy rain occurrence,which is warm advection;smaller wind shear was favorable to produce strong precipitation;atmospheric instability in the middle and lower troposphere provided unstable energy condition;heavy rainfall generally appear in unstable region in front of cloud moving direction.
关键词
大到暴雨/环流形势/物理量场/卫星云图/都兰县Key words
Heavy to torrential rain/Circulation situation/Physical quantity field/Satellite cloud picture/Dulan County引用本文复制引用
出版年
2016
国家科技期刊平台
NSTL
维普
万方数据