摘要
本文用比较分析方法研究了长江流域梅雨期间一种难以预报的强对流暴雨的物理特征。这类发生在远离锋区的暖区內的强对流暴雨,高层辐散区与低层辐合区经常不同步移动。当高层辐散区沿副高边缘东移叠加在低层准静止辐合区上空时,暴雨发生;当它移离辐合区时暴雨结束。因此,对这类暴雨要着重对200hPa以上辐散场的分析,配以低层辐合条件,才可获得较好的预报效果。
In this paper, the physical features of a severe convective heavy rain, which occurs during the Meiyu period in the reaches of the Changjiang River and is difficult to forecast, are studied by the control analysis method. In such a severe convective heavy rain oecuring in the warm section far from the front, the upper divergence and lower convergence seldom move synchronously. When the upper divergence moving eastward along the edge of the subtropical high overlaps the lower quasi-static convergence, there occurs a heavy rainfall, and when the upper divergence moves away from the convergence, the heavy rain stops. Thus, attention should be paid to the divergence field above 200 hPa as well as the conditions of the lower convergence so that good results can be achieved for forecasting such heavy rain.
出处
《南京气象学院学报》
CSCD
1990年第4期524-528,共5页
Journal of Nanjing Institute of Meteorology
