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 h Pa低压中心,700、850 h Pa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。
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 h Pa low pressure center,700 h Pa,850 h Pa 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.
出处
《安徽农业科学》
CAS
2016年第12期226-228,共3页
Journal of Anhui Agricultural Sciences
关键词
强降水
环流背景
物理量
雷达回波
山东半岛北部
Strong precipitation
Circulation background
Physical quantity
Radar echo
Northern Shandong Peninsula
