中文摘要：

利用深圳市气象局的闪电定位网资料、多普勒雷达资料和常规天气资料，分析了深圳地区2012年4月一次强飑线过程的地闪变化特征以及闪电活动与雷达回波特征的相关性。结果表明，在整个飑线过程中随着时间的推移，正地闪占地闪总数的比例虽然有所增大，但负地闪仍然占绝对优势，正、负地闪主要发生在30dBZ以上的强回波区，地闪分布与雷达回波强度表现出很好的对应关系；在-10℃、-15℃和-20℃三个高度层上，雷达回波强度的每一次跳跃变化都对应着地闪频数的跃增，且地闪频数跃增的时间与回波强度跃增时间一致，其中-20℃层高度上回波强度与地闪频数相关性最好；在飑线过程不同阶段，雷达回波强度的概率密度分布等特征量可以反映闪电频数在相应时期的变化；另外，强回波面积与闪电活动也有较好的相关性，其中一5cC层高度上超过40dBZ的雷达反射率面积与地闪频数的相关系数为0．90，其对数拟合优度R0为0．798，各温度层上相关系数最高项的线性拟合效果均好于对数拟合。

英文摘要：

The evolution characteristics of cloud-to-ground lightning activity and their relationship with radar echoes during a severe squall process on 27 April, 2012 in Shenzhen were analyzed by using the lightning location data from Shenzhen Meteorological Bureau, Doppler radar data and synoptic information. The results show that the percentage of positive cloud-to-ground （CG） flashes frequency increased with time in the squall process, but the occurrence of negative CG flashes was always in the leading position. Most of CG flashes occurred in the regions with radar reflectivity factor ≥30 dBZ, and the CG flash distribution had a good corresponding relation with the radar echo intensity. Every jumping change of the radar echo intensity at the heights of-10 ℃, -15 ℃ and -20 ℃ corresponded to the jumping development of the frequency of CG flashes, and the jumping times of CG flashes frequency were consistent with the radar echo intensity. Among these indices, the correlation is the best between echo intensity at the -20 ℃ layer height and CG flashes frequency. Probability density function （PDF） distribution of radar echo intensity at different stages of the squall can reflect the change of lightning frequency. In addition, it is seen that the CG flash frequency has a strong linear correlation with the radar echo area at the -5 ℃ layer height with reflectivity exceeding 40 dBZ, and the correlation coefficient is 0.90. Its curve fitting value R2 is 0.798. The linear fitting results at each height are better than the logarithmic fitting.