摘要
利用贵州省铜仁市新一代多普勒天气雷达资料和贵州省气象局闪电定位仪资料,对黔东北2013-2015年5-8月对流性降雨过程中的雷电活动与雷达回波单体之间的相关性进行统计分析,提取出反映雷电活动的雷达产品特征量,得出该区域雷电预警阈值。结果表明:35.0 d Bz回波顶高(ET)突破-10℃层高度和25.0 d Bz回波顶高突破-20℃层高度这两个指标预警效果较好,成功预警率POD为0.99和0.96,预警提前时间Tw分别为23和17 min;回波顶高大于9.0 km预警雷电发生,预警提前时间为11 min;垂直液态水含量可以作为雷电预警的必要条件,其值介于5.0~15.0 kg·m-3。
Based on the new generation doppler weather radar data and lightning locator data in Guizhou,the relationship between lightning activity and radar echo cells in the convective rainfall in northeast of Guizhou from May to August during 2013-2015 were statistically analyzed,the radar products quantity which could reflect the lightning activity were extracted and the threshold of lightning warning in the region were obtained. The results showed that the two indices that echo top( ET) of 35. 0 d Bz and 25. 0 d Bz reflectivity exceed the height of-10 ℃ and-20 ℃ layer had better lightning warning effect,the success rate of warning were 0. 99 and 0. 96,the advance time of lightning warning were 23 and17 minutes respectively. The warning could be 11 minutes earlier than the occurrence of lightning when the ET exceeding 9. 0 km were used to warning lightning. Vertical integrated liquid water( VIL) could be a necessary condition for lightning warning,whose value was 5. 0 ~ 15. 0 kg·m^(-3).
出处
《气象与环境科学》
2017年第3期139-143,共5页
Meteorological and Environmental Sciences
基金
黔科合项目"基于多普勒雷达速度产品的梵净山区域短时强降水预报预警技术研究(黔科合[2016]支撑2813)"
铜气科合[2016]01号"基于实测降水强度下的铜仁市暴雨Z-R关系研究"
贵州省科技厅联合基金项目(黔科合LH[2014]7484)资助
关键词
雷电预警
预警阈值
回波强度
回波顶高
垂直液态水含量
lightning warning
warning threshold
echo intensity
echo top
vertical integrated liquid water
