摘要
为了找出湖南地区多普勒天气雷达回波与云地闪特征以及关系,利用湖南省2007年闪电定位系统和长沙多普勒天气雷达探测资料,对湖南省周边地区闪电特征及其与雷达回波关系进行统计分析。结果表明:湖南省及周边地区云地闪分布具有明显时间分布不均特征,大多发生6、7、8月,月初和月末为高峰期,日分布呈双峰值变化,主峰在16:00—17:00,次峰在20:00—21:00,17:00左右日均频数最高,对应雷电灾害最为严重。雷达回波面积及强度与云地闪频数及强度存在明显对应关系,云地闪频数越大,强度越强,则雷达回波面积越宽,强回波出现几率越大。大于50 d Bz雷达强回波中心形成前15 min到30 min时间内,一般都有云地闪发生。雷达回波位置与闪电发生区域具有很好的一致性。
The paper aims to find out the characteristics and relationship of Doppler weather radar echo andcloud-ground lightning in Hunan Province. Based on the lightning positioning system and Doppler weatherradar echo images of Hunan Province in 2007, the lightning information and radar echo data were discussed inthis paper. The results showed that the time distribution of lightning was obvious and uneven in HunanProvince and its surrounding areas, the peaks occurred in the beginning and ending of June, July and August,with two interval peak values in daily distribution(16:00 to 17:00 pm and 20:00 to 21:00 pm, respectively), andthe average daily frequency of lightning activity showed a peak approximately at 17:00. There was a significantcorrelation between the area and intensity of radar echo and the lightning frequency and intensity, the radarecho area enlarged with the enhancement of the frequency and intensity of lightning. The cloud-to-groundlightning occurred 15 to 30 min before the formation of intensive radar echo center which was bigger than 50 d Bz. The position of the lightning and radar echo area had good consistency with each other.
出处
《中国农学通报》
2016年第11期115-120,共6页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金项目(31201124)