摘要
利用常规天气资料和多普勒雷达资料对2007年7月3日承德市一次强对流天气过程进行了综合分析,发现大气不稳定指数的变化和θse的水平、垂直分布反映了大气的层结状态和不稳定能量积聚的状况;温度平流和螺旋度的垂直分布,显示了强对流发生前大气的热力、动力特征;散度、垂直速度随时间—高度的变化,对强对流天气的发生有着动力触发作用;高低空风场的配置和通气管指数可以判断垂直风切变的大小,是决定强对流天气发生及强度的重要条件;多普勒雷达基本反射率因子的形态、强度、移向、垂直结构等特征及平均径向速度场中气旋、中尺度辐合线、逆风区等中小尺度系统特征对强对流天气的预警至关重要。
Based on the conventional weather data and the Doppler radar data,a strong convective weather process occurred on July 3,2007 in Chengde of Hebei Province was analyzed.Results show that the change of atmospheric unstable index and the level and vertical distribution of θse can reflect the atmospheric stratification condition and the unstable energy accumulation.The temperature advection and the vertical distribution of helicity can demonstrate the atmospheric thermal and dynamic characteristics before the strong convection weather occurrence.The divergence and vertical velocity changing with time and height triggered the strong convection weather.The configuration of high and low level wind field and the air vent index can judge the size of vertical wind shear.The Doppler radar basic reflection factor played a key role in the pre-alarm of a strong convection weather.
出处
《干旱气象》
2010年第3期322-326,357,共6页
Journal of Arid Meteorology
基金
河北省气象局科研开发项目"新一代雷达在承德灾害性天气短时预报中的应用"资助
