甘肃平凉闪电定位资料误差分析及其优化

利用陈明理等提出的场地误差优化模式，对2001年甘肃省地形起伏较大的平凉地区地闪定位资料进行了优化处理，并选取雷达回波强度大于35 dBz、回波顶高超过7 km的区域作为优化效果验证参考。结果表明，未经场地误差优化的闪电位置远离对应雷达回波数十公里，而优化后对应的闪电位置进入或接近雷达的强回波区，显然更接近于真实情况，优化以后的方位探测器测向角平均偏差可达05°左右。场地误差优化模式能有效地优化闪电定位资料，这对进一步提高雷电临近预警具有积极的意义。

Error Analysis and Correction of Lightning Location Data in Pingliang, Gansu Provience

Based on the site error model for optimizing the lightning location data, about 200 lightning flash samples in Pingliang, Gansu Province are corrected and compared with the radar echoes of over 35 dBz at the corresponding cloud top height of over 7 km. The results show that the uncorrected CG （Cloud to Ground lightning flashes） locations are tens of kilometers apart from the radar echo area, and the corrected CG lightning locations are very close to the strong radar echo area. The results also show that the residual errors between the corrected and real flash directions are less than 0.5° after correcting. The site errors of the lightning location system can be minimized by this optimizing model, and this parameterization method of the site errors estimation is very important for the development of now casting lightning forecast.