摘要
利用2011年1月至2019年12月安徽省ADTD闪电定位系统监测资料,对安徽南部山区与北部平原的闪电频次、极性、雷电流强度等参数进行对比分析。结果表明:安徽南部山区总闪电频次约为北部平原的2.84倍,北部平原正闪比高于南部山区,这与两地区强对流天气类型有关。两地区闪电频次的月、日变化均呈单峰分布,春季、夏季闪电活动明显多于秋季、冬季,午后至傍晚为一天中的雷电活跃时段,但南部山区在雷电高发月份及时段的闪电频次波动程度远大于北部平原。在雷电流强度方面,北部平原整体上大于南部山区,正、负地闪强度分别高出10.77 kA、9.52 kA,其中正地闪强度峰值均出现在2月,负地闪均为10月,南部山区正、负地闪及北部平原负地闪日强度峰值与频次峰值时段相反。对安徽省总闪频次进行主成分分析表明,EOF分解的前5个特征向量累计方差贡献达到59.137%,空间上表现出安徽南部山区与北部平原雷电活动变化趋势既具有一致性,也具有明显的南北差异。
According to the detected data of the ADTD lightning location system in Anhui province from January 2011 to December 2019,the parameters associated with lightning such as frequency,polarity,current intensity,etc.in southern mountain areas and northern plains in Anhui province were comparatively analyzed.The results showed that the total lightning frequency in southern mountain areas is about 2.84 times of that in northern plains,and the positive lightning ratio is larger in northern plains than in southern mountain areas,which is related to the types of severe convective weather.In the two areas,the monthly and daily variation of lightning frequencies both present the single peak,and the incidences in spring and summer are significantly more than in autumn and winter,and the lightning is active from afternoon to evening in a day,but the fluctuation range of months and time bucket when lightning occurs at high frequency in southern mountain areas are far greater than in northern plains.The intensities of lightning current in northern plains,on the whole,is larger than in southern mountain areas,and the positive and negative lightning intensities for the former are 10.77 kA and 9.52 kA higher than those for the latter,and the peak values of positive and negative lightning intensities in the two areas both appear in February and October,respectively.The time buckets of positive and negative lightning intensity peak in southern mountain areas and negative lightning intensity peak in northern plains are opposite to those of their frequency peak.Based on the principal component analysis of the total lightning frequency in Anhui province,the cumulative variance contribution of the first five feature vectors after EOF reaches 59.136%,indicating the change trend of lightning activities in the two areas are consistent,but has obvious regional difference.
作者
王凯
鞠晓雨
邱阳阳
程向阳
WANG Kai;JU Xiao-yu;QIU Yang-yang;CHENG Xiang-yang(Huaihe River Basin Meteorological Center,Hefei 230061,China;Anhui Meteorological Disaster Prevention Center,Hefei 230061,China)
出处
《气象与环境学报》
2022年第4期110-117,共8页
Journal of Meteorology and Environment
基金
安徽省重点研究与开发计划项目(202004h07020001)
安徽省气象局新技术集成项目(AHXJ202004)共同资助。
关键词
闪电定位系统
闪电频次
雷电流强度
Lightning location system
Lightning frequency
Lightning current intensity
