地闪特征在冰雹天气识别中应用分析

The Applied Analysis of Cloud-to-Ground Lightning Characteristics in the Hail Weather Identification

利用福建省闪电定位和地面观测资料,对福建2013—2015年14次冰雹过程的地闪活动特征和变化机制进行了研究.通过分析发现,冰雹天气过程中正地闪占总地闪的比例平均为14.2%,远高于2004—2015年福建地区正地闪比例的气候特征值3.4%.14次降雹过程中,地闪过程平均提前28.9min被观测到,正闪提前18.2min被观测到,正闪次数峰值一般出现在降雹之后.降雹之前,闪电的最大强度(陡度)绝对值呈变大趋势,降雹过程中,闪电最大强度(陡度)绝对值呈无明显规律变化,在降雹结束阶段,闪电最大强度峰值的绝对值呈减小趋势.以上这些特征揭示了冰雹天气过程中的地闪演变规律,可以作为福建地区冰雹天气过程监测和识别的参考指标.

Using the data of lightning locating system and field observation in Fujian province,the characteristics and variation mechanisms of cloud-to-ground（CG）lightning be studied in Fujian province of 14 hail weather from2013—2015.Although a lot of researchers have analyzed,and the results show that the mean proportion of positive CG lightning accounting for total CG lightning is 14.2%,which is much higher than the Fujian province climatic normal rate by 3.4% from 2004—2015.In the 14hail-failing,the CG lightning is monitored 28.9 min earlier the hail-failing,the positive CG lightning is monitored 18.2 min earlier the hail-failing,and the peak positive CG lightning is occurred after the occurrence of hailstones usually.The absolute value of intensity and steepness of CG lightning are lager before the hail-failing,The absolute value of intensity and steepness of CG lightning do not significantly laws in the hail-failing process,the absolute value of intensity a of CG lightning is smaller before the hail-failing.These features have revealed some evolvement rule of CG lightning in the hail weather,these features can be the indicator of hailstorms forecasting and identification in Fujian province.