摘要
对信息产业部第22所研制的XDD03A雷电探测系统获取的2000～2003年北京地区云-地闪电资料进行了闪电的日变化、月变化、闪电的强度、闪电密度、极性等方面的分析,研究了北京地区的闪电分布特征.结果表明:云地闪中负闪占大多数;正闪的平均强度大于负闪;闪电的发生有明显的日变化,呈双锋双谷形式;最多闪电日数出现在7月和8月,几乎每天都出现闪电,而闪电次数最多则出现于8月份.北京地区闪电分布主要集中于4个区域,闪电的空间分布与地形及下垫面的性质有关.
Based on the cloud-to-ground （CG） data from 2000 to 2003 collected by the XDDO3A lightning detection system in Beijing, a study was made of the daily and monthly lightning variation, as well as lightning intensity, polarity and density, etc. , and the climatic characteristics of lightning in Beijing was analyzed. The results show that most cloud-to-ground flashes are negative; the mean intensities of positive CG flashes are bigger than those of the negatives; the CG flashes have a daily variation characteristic of two peaks and two valleys; the maximum number of lighting days was found in July and August （lightning occurs almost every day）, and lightning occurs most frequently in August; and in Beijing, CG flashes occurred mostly in four areas, and the spatial distribution of lightning is related to the topography and the nature of the underlying surface.
出处
《气象科技》
2005年第6期496-500,共5页
Meteorological Science and Technology
基金
"十五"国家科技攻关计划重大项目"人工增雨技术研究及示范"课题资助
关键词
闪电定位系统
云地闪
密度
lightning detection system, cloud-to-ground lightning, lightning density
