摘要
利用合肥多普勒天气雷达回波和各种常规资料,对2010年梅雨期皖江一次大暴雨天气过程的雷达回波进行分析,探讨短时大暴雨的回波特征。结果表明:有利的大尺度环流,充足的水汽条件和较强的上升运动是产生强降水有利的天气背景。雷达资料分析发现形成此次皖江暴雨的源地位于大别山区,强降水是由局地发展的对流回波加强合并产生的,回波的发生和发展加强常常与风场的局地强辐合区(逆风区)相联系,雨带在中低空切变线上合并加强,强降水区域尺度较大,单体回波移向和雨带走向一致,回波移动缓慢或呈准静止状态,累积雨量大,易于形成暴雨。
The characteristics of Radar echoes during the heavy rainfall event from 9 to 16 July 2010 along the Yangtze River in Anhui are analyzed on the basis of conventional meteorological data and Doppler radar data of Hefe Station. It is concluded that the favorable larger scale circulation，ample water vapor, and stronger ascending movement are the advantageous weather background for the severe rainfall. The results show that the source regions of heavy rainfall along the Yangze River in Anhui are often in the Dabie Mountains. The formation and development of radar echoes during heavy rains are always related with the local strong convergence in wind field （adverse wind regions）. Heavy rainfall events are prone to happen when rainbelts are combined along the low level shear line and then strengthened, and when single echoes move in the same direction with the larger scale rainbelt area slowly or quasi stationarily.
出处
《气象科技》
2013年第6期1101-1108,共8页
Meteorological Science and Technology
