山东省一次积层混合云暴雨三维风场的双多普勒雷达探测  

Mesoscale Wind Structures of a Mixed Cloud Heavy Rain in Shandong by Dual-Doppler Radar

作　　者：盛日锋[1] 王俊[1] 李欣 龚佃利[1] 

机构地区：[1]山东省人工影响天气办公室,山东济南250031 [2]山东省蒙阴县气象局,山东蒙阴276200

出　　处：《南京气象学院学报》2008年第5期731-737,共7页Journal of Nanjing Institute of Meteorology

基　　金：武汉暴雨所暴雨研究开放基金项目(IHR2006G06);山东省自然科学基金项目(Y2006E08);山东省局2005年重点攻关项目;国家科技支撑计划资助项目(2006BAC12B02);山东省局2008年科技项目“山东积层混合云宏观结构特征研究”

摘　　要：使用地基双多普勒天气雷达监测资料和常规探测资料,对2005年9月19日凌晨发生在鲁中地区的一次暴雨进行分析,结果表明:本时段暴雨是积层混合云降水所致,中低层存在切变线和辐合线,风场中尺度结构造成小尺度对流单体的发展,这些对流单体以带状结构组成回波群镶嵌在大面积的层状云中;伴随弱冷空气侵入,风场的中尺度结构主要出现在4 km以下的层次,中低层切变线和冷空气的侵入是强回波单体发展的动力因素;在垂直方向上,强回波区有明显的垂直运动。风场的中尺度结构对鲁中强降水的发生和维持有重要作用。The three-dimensional wind fields of the heavy rain on September 19th, 2005, in middle Shandong Province are retrieved and explored with ground-based dual-Doppler radar data and conventional observations. Results show that the heavy rain is caused by the cumulus-stratus mixed cloud with the shear and convergence lines in the low level. Development of the small-scale convective cell is induced by the mesoscale structure of wind field, and the cells nested in the large stratus are organized to echo bands. Along with cold air diffusing southeastward, the mesoscale structure of wind field mainly locates in the layer below 4 krn. Kinetic factors of the cell with a strong echo are shear lines in the low and middle levels and cold air diffusion. Moreover, it is found that the marked vertical motion happens in the strong echo area. The wind mesoscale structure plays an important role in initiating and maintaining the heavy rain.

关 键 词：双多普勒雷达 暴雨 三维风场 中尺度结构 

分 类 号：P412.25[天文地球—大气科学及气象学]