【摘要】 针对雁江区的雷电活动规律研究较少问题,利用雷暴日资料以及闪电定位资料,通过数学统计方法对雁江区雷电活动规律进行分析。结果表明:雁江区年雷暴日呈现波动下降趋势,且波动较为强烈,初雷日呈推迟趋势,终雷日呈提前趋势,雷暴持续期呈缩短趋势,雷暴日呈现逐渐集中趋势。年雷暴日在4~8 a、24~32 a尺度上存在明显周期性震荡。雁江区闪击主要集中在夏季,以负闪电为主。日变化呈现单峰趋势,半晚时分最频繁,夜间呈现下降趋势,在早晨闪电活动最弱。此外,负闪击主要分布在21~40 k A,雷电流强度超过100 k A的闪电出现的概率较小。更多还原

【Abstract】 Aiming at less studies on the law of lightning activities in Yanjiang district,we used the data of thunderstorm day and lightning location system to analyze the law of lightning activities in Yanjiang district by using mathematical statistical method.The results showed that: in Yanjiang district,the number of annual thunderstorm day fluctuated downward and strongly; the date of the earliest thunderstorm day revealed a delaying trend,and the date of the final thunderstorm day revealed an ahead trend,namely the thunderstorm duration was shortened and the thunderstorm days were concentrated; the oscillation of annual thunderstorm day number had obvious periods in the scales of 4 ~ 8 a and 24 ~ 32 a. The lightnings in Yanjiang were mainly concentrated in summer,and they were mainly negative lightning; the daily lightning activity showed a single-peak trend,and it was frequent at owl-light,moderate at night,and weak in the morning. In addition,the negative lightning was mainly distributed in 21 ~ 40 k A,and the occurrence probability of lightnings with the current intensity of more than 100 k A was small.更多还原