重庆地区地闪活动空间分布及其趋势分析  

Analysis of the Spatial Distribution of Cloud-to-Ground Lightning Activities in Chongqing and Their Develoment Trend

作　　者：李家启[1,2] 申双和[2] 刘俊[1] 林涛[1] 陈宏[1] 

机构地区：[1]重庆市气象局,重庆401147 [2]南京信息工程大学应用气象学院,南京210044

出　　处：《西南大学学报（自然科学版）》2012年第5期77-84,共8页Journal of Southwest University(Natural Science Edition)

基　　金：公益行业专项资助项目(GYHY(QX)2007-6-22-4);中国气象局软科学课题资助项目(应急救援防雷安全技术研究);重庆市气象科技资助项目(YWGG201208;YWGG201217)

摘　　要：采用经验正交函数(EOF)分解、旋转经验正交函数(REOF)分解、多分辨率分析、数理统计和趋势分析等方法,对重庆地区1999-2008年地闪频率、强度、回击次数进行统计,对地闪频率资料标准化距平场进行分区,并对地闪异常的空间分布特征、时间变化规律进行分析.结果表明:重庆地区地闪发生频率呈现增长趋势,主要表现为春季、夏季地闪增加;地闪频率的主要空间异常型表现为全市一致型(多雷或少雷型),渝西多雷(少雷)和渝东北少雷(多雷)反向型,这是重庆地闪异常的主要特征;地闪异常区域大致可划分为4个区,即渝西、渝中部、渝东南、渝东北区;地闪活动存在12个月、20个月、29个月左右较长周期和3个月、6个月左右较短周期振荡.Adopting empirical orthogonal function （EOF）, revolving empirical orthogonal function （RE- OF）, multi-resolution analysis, mathematics statistics and trend analysis, a statistical study was made of the frequency, intensity and back striking times of cloud-to-ground lightning from 1999 to 2008 in Chongqing area, zoned the standardized anomaly field of the lightning and analyzed the spatial distribution characteristics and time variation of abnormal lightning. The results showed that in Chongqing area the lightning incidence was increasing, especially in spring and summer; the spatial abnormality of lightning frequency was uniform （more or less lightning） in the whole area, and reverse in western part of the area （less lightning） and northeastern part （more lightning）, which were the main characteristics of abnormal lightning in Chongqing; the area of abnormal lightning was roughly divided into {our regions, i.e. west- ern, central, southeastern and northeastern regions; the longer periods of lightning activity were about 12 moths, 20 months and 29 months, and the shorter oscillation periods were about 3 months and 6 months.

关 键 词：经验正交函数(EOF) 旋转经验正交函数(REOF) 趋势分析 地闪活动 

分 类 号：P427.32[天文地球—大气科学及气象学]