江西一次强风暴天气过程闪电参量特征分析  

Characteristic Analysis of Lightning Parameters during a Severe Storm Process

作　　者：李玉林[1] 杨梅[2] 

机构地区：[1]江西省人工影响天气领导小组办公室,江西南昌330046 [2]江西省气象台,江西南昌330046

出　　处：《气象与减灾研究》2008年第2期43-47,共5页Meteorology and Disaster Reduction Research

基　　金：国家科技攻关项目(编号:2001BA610A-06-02)

摘　　要：利用闪电探测资料和多普勒天气雷达资料,对2003年4月12日发生在江西境内的1次强风暴天气过程的闪电参量特征进行分析和计算。结果表明,闪电强度、闪电陡度、闪电电荷变化趋势基本相同,并呈多峰型变化,出现峰值时间比降雹时间早18min;闪电强度、闪电陡度、闪电电荷、闪电能量的平均值分别为-838.4kA、-1163.8kA/μs、-34.2C、653.1×103J,最大值分别为-3387.2kA、-4802.2kA/μs、-86.9C、2390.5×103J。回波参量与闪电参量回归分析结果表明,顶高≥14.0km回波面积最大值出现时间比降雹时间迟24min;强度≥40.0dBz回波面积最大值和垂直积分液态含水量≥40.0kg/m2回波面积、面水量最大值出现时间比降雹时间早18min。研究认为,闪电参量变化对强风暴、冰雹和强对流云降水天气的预警预报,具有指示性作用。In this paper, the data of Doppler weather radar and lightning detector in April 12, 2003 were employed to analyze the characteristics of lightning parameters of the storm in Jiangxi province. The result indicated that the change trends of lightning intensity, lightning steepness and lightning charge were similar and had multi-peak waves which occurred 18 min earlier than those of hail falling. The average values of lightning intensity, lightning steepness, lightning charge and lightning energy were respectively -838.4 kA, -1 163.8 kA/μs, -34.2 C, 653.1×10^3 J,and the maximum ones were -3 387.2 kA, -4 802.2 kA/μs, -86.9 C, 2 390.5×10^3 J. The regression analysis of radar echo and lightning parameters showed that the maximum area with echo top ≥14.0 km occurred 24 min later than that of hail falling. The maximum areas with echo strength ≥40.0 dBz and vertical integrate liquid ≥40.0 kg/m^2 and the maximum value of area water content occurred 18 min earlier than those of hail falling. It is suggested that the change of lightning parameters presents indicative function to forecasting severe storm, hail and strong convective cloud precipitation.

关 键 词：强风暴 闪电参量 雷达产品 回归分析 

分 类 号：P427.321[天文地球—大气科学及气象学] P412.25