2015年9月1～2日山东半岛北部强降水过程分析
Analysis on Heavy Precipitation Process in Northern Shandong Peninsula during Sep.1st-2nd, 2015
邹斌 1孙艺1
作者信息
- 1. 山东省龙口市气象局,山东龙口265700
- 折叠
摘要
利用常规天气图、多普勒等效雷达、区域自动气象站等资料,从环流背景、物理量、雷达回波特征等方面对2015年9月1～2日发生在山东半岛北部附近的强降水进行综合分析.结果表明,强降水发生在500 hPa低压中心,700、850 hPa受明显的切变线影响,低压中心周围的风速差较大,产生强烈的气旋性辐合区;半岛北部存在明显的上升运动,上升运动将低层不稳定性向上输送,使对流不稳定性层次增厚,有了形成强降水的动力机制;半岛北部附近存在明显的水汽辐合区,有充足的水汽输送;以上的动力条件和水汽条件是造成强降水的关键.对流不稳定能量不断累积增强,为此次强降水的形成提供了充足的能量;同时,雷达强降水回波也不断生成;特殊的沿海地形影响对这次强降水的形成也起重要作用,同时也造成了降水时空分布不均匀.
Abstract
By using data of conventional weather map,doppler equivalent radar,regional automatic weather station,from aspects of circulation background,physical quantity and radar echo features,heavy precipitation occured in northern Shandong Peninsula during Sep.1-2,2015 were analyzed.The results showed that strong precipitation occurred in the 500 hPa low pressure center,700 hPa,850 hPa affected by the shear line,the wind speed difference around the low pressure center was larger,forming a strong cyclonic convergence zone.There was an obvious upward movement in the northern part of the peninsula,through upward movement of lower layer,convective instability layer was thickened;the water vapor convergence zone existing around the peninsula provided adequate water condition.Convective instability energy was constantly accumulating,which provides sufficient energy for the formation of heavy precipitation;meanwhile,radar echoes were aldo generated;special coastal terrain not only played an important role in the formation of the heavy precipitation,but also caused the uneven distribution.
关键词
强降水/环流背景/物理量/雷达回波/山东半岛北部Key words
Strong precipitation/Circulation background/Physical quantity/Radar echo/Northern Shandong Peninsula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