摘要
本文利用多普勒天气雷达资料,分析了槽线附近风场的中尺度结构特征。结果表明,在槽线附近存在有中尺度辐合区和辐散区,造成槽前层状云降水的不均匀性。槽线附近的近地面为冷平流,中层为暖平流,水平风的垂直切变在2.0～2.5km高度上,2.7km上空有微弱的上升气流,它的中尺度环流特征造成雨区向东北方移动。
In this paper, the characters of mesoscale structurs near the trough line are analysed based on the wind data of Doppler weather radar.It is shown that there are mesoscale divergence and convergence regions exis-ting near the trough line,thus causing the uneven distribution of precipi-tation. A cold advection occurs is in the boundary layer near to the ground while a warm advection forming at the level between 2.5km and 5.0km. The vertical wind shear appears at the 2.0-2.5km high level and the weak updraft at 2.7km high level. The precipitation area moves northeastward, due to the influence of the mesoscale circulation.
出处
《气象》
CSCD
北大核心
1991年第4期9-13,共5页
Meteorological Monthly
