新一代可移式天气雷达在人工影响天气中的应用研究

Preliminary Application of Movable Doppler Radar in Weather Modification

在总结“十五”国家科技攻关重大计划项目“人工增雨技术研究及示范”成果的基础上,利用我国可移式新一代天气雷达在青海省河南县和河南省许昌市进行秋(春)季降水系统中尺度结构外场试验观测的方法和技术,对这两个地区云和降水的若干特征进行了分析;另外,使用两步变分方法反演了风场结构,分析了层状云和对流云的中尺度回波强度和动力结构。结果表明:新一代天气雷达可为人工影响天气作业指挥和云物理研究提供更多信息,包括风场中尺度结构、辐合线位置等;青海省河南县及周边地区秋季降水以对流云降水为主,低空辐合是对流云旺盛发展的重要原因;河南省许昌市春季降水既含有对流云降水也含有层状云降水,对流云降水过程伴有低空辐合,层状云内风场比较均匀,但风的垂直切变明显,多为暖平流。

The Movable C band Doppler radar was used to observe mesoscale structures of precipitation in Henan county, Qinghai Province, and Xuchang, Henan Province, to study the features of cloud and precipitation. The two-step assimilation wind retrieval method was used to analyze the dynamic structures of convective and stratus precipitation systems. The results show that the Doppler radar would provide more information for weather modification operation and research, including wind field and convergence line. The convective precipitation is important in the fall in Henan county, Qinghai Province, the convergence in low level is key factor for con- vective development. The precipitation system in Xuchang, Henan Province includes convective precipitation and stratus precipitation, the convective precipitation is concomitance with low level convergence, the wind field is homogeneous in horizontal direction in stratus clouds, but the wind shear in vertical direction is obvious, most of wind shear is warm advection.