摘要
普查2002-2006年3-5月和9-11月河南省5站以上连片日降雨量为小到中雨的133个降水日的天气形势,对其中69个降水日的郑州714CD多普勒雷达强度、速度场资料进行了分析,结果表明:河南春秋季降水回波主要为层状云降水和以稳定性为主的混合性降水回波;强度30 dBz左右、分布均匀的连续性片状回波和以稳定性为主的混合性降水回波有明显增雨潜力,其回波分布区域也是很好的作业区域;根据RHI回波高度和0℃层亮带高度变化可制定飞机飞行的最佳高度;速度场上出现暖平流辐合、冷平流辐合、近地面东北风辐合3种类型时有利于实施飞机人工增雨作业。
The 714CD Doppler radar intensity of 69 precipitation days in Zhengzhou and velocity field data were detailed analyzed by general surveying the synoptic situation of 133 rainfall days with daily precipitation up to flurry or middle rain at more than 5 stations during March to May and September to October during 2002-2006 in Henan province. The results showed that： the main precipitation echoes is stratiform cloud rainfall and mixed precipitation echo with stability in spring and autumn in Henan; conti- nuity sliced echo with 30 dBz or so and evenly distributed and mixed precipitation echo characteristics with stability had noticeable potential of artificial precipitation enhancement, the echoes distribution area was a better region of weather modification operation ; The best flight level was made based on the height of RHI echo and 0 ℃ layer. The convergence of warm advection, cold advection and northeaster wind on surface in velocity field were beneficial to operating aircraft artificial precipitation enhancement.
出处
《气象与环境科学》
2009年第B09期180-184,共5页
Meteorological and Environmental Sciences
基金
河南省重大科技攻关项目"河南省云水资源开发利用技术研究与示范"(0522030400)资助
关键词
飞机增雨
作业时机
作业区域
回波强度
速度场特征
短时预测
aircraft cloud seeding
operation opportunity
operation region
echo intensity
velocityfield characteristic
short-range prediction
