广西输电线路覆冰典型年份的环流特征分析  

Circulation Characteristics of Transmission Line Ice-coating in Guangxi in the Typical Years

作　　者：覃武 罗小莉 郑凤琴 钟利华 周绍毅[3] 苏志[3] QIN Wu;LUO Xiaoli;ZHENG Fengqin;ZHONG Lihua;ZHOU Shaoyi;SU Zhi(Guangxi Meteorological Bureau,Nanning 530022,China;Guangxi Weather Service Center,Nanning 530022,China;Guangxi Climate Center,Nanning 530022,China)

机构地区：[1]广西壮族自治区气象局,广西南宁530022 [2]广西壮族自治区气象服务中心,广西南宁530022 [3]广西壮族自治区气候中心,广西南宁530022

出　　处：《沙漠与绿洲气象》2019年第1期110-116,共7页Desert and Oasis Meteorology

基　　金：广西科学研究与技术开发计划项目(桂科攻1598017-15);国家自然科学基金项目(41565005)共同资助

摘　　要：采用NCEP/NCAR逐月再分析资料、广西北部43个气象台站的温度、湿度、风、降水、导线覆冰等观测资料以及广西输电线路覆冰资料,建立雨凇覆冰厚度计算模型,并得出气象台站的历史覆冰厚度序列。采用数理统计和合成分析等方法研究典型覆冰年份的时空特征、环流背景及气象要素变化特征,结果发现:广西输电线路覆冰主要出现在冬季的桂北,并有逐年减轻的趋势,MannKendall突变检验表明,存在1个明显的突变点,出现在1985年;广西典型覆冰年份,500 hPa欧亚大陆中高纬地区呈明显的"两槽一脊"型,广西高空处于南支槽前,地面受冷高压脊控制;赤道中东太平洋,从夏季到秋季,海温由偏高转为偏低,到冬季SSTA维持为负距平,说明广西输电线路覆冰与LA NINA事件有较密切的关系。当日最低气温在0.2℃以下,风速<5 m·s-1,并伴有雨凇和弱降水,低温寡照天气时容易出现覆冰。The ice thickness calculation model of glaze ice-coating was established and the history data sequences of the ice thickness of the meteorological stations were calculated,based on the NCEP/NCAR monthly reanalysis data,the observation data from 43 meteorological stations in northern Guangxi(temperature,humidity,wind,precipitation,conductor ice coating)and the transmission line ice coating data.The spatial and temporal distribution,the air circulation background characteristics and the meteorological element change features in typical ice coating years were studied by means of mathematical statistics and synthetic analysis.The results showed as follow:The ice coating of transmission line occurred mainly in winter and in northern Guangxi.It showed a decreasing trend year by year,Mann-Kendall sudden change test showed that there was an obvious sudden change point,which appeared in 1985.In the typical ice coating year of Guangxi,the height field at 500 hPa in the mid-high latitudes of Eurasia showed“two troughs and a ridge”,and Guangxi is located in front of the southern trough,and a cold high pressure ridge controlled Guangxi surface.From summer to autumn,the sea surface temperature turned from high to low and the sea surface temperature anomaly(SSTA)in winter kept negative in the middle and east equatorial Pacific,therefore there was a close relationship between Guangxi ice coating and La Nina events.Ice coating was prone to be occurring when the minimum temperature was below 0.2℃,the wind speed was less than 5 m/s,and it accompanied by glaze and weak precipitation,low temperature and less sunshine.

关 键 词：输电线路覆冰 典型年份 环流特征 

分 类 号：TM752.5[电气工程—电力系统及自动化] P458.2[天文地球—大气科学及气象学]