两次高压电线积冰过程气象成因分析  

Analysis of the causes for two high-voltage wire icing cases

作　　者：刘雪静[1] 牛生杰[1] 

机构地区：[1]南京信息工程大学大气物理学院江苏省大气环境与气象装备协同创新中心,南京210044

出　　处：《气象科学》2016年第2期230-235,共6页Journal of the Meteorological Sciences

基　　金：国家自然科学基金项目资助项目(41375138;41271515)

摘　　要：对2008年2月25—26日和2009年1月5—9日湖北省500 kV高压输电线路张恩1回线307号杆塔采集到的两次积冰过程进行分析,结果表明:两次积冰过程具有相似的环流形势即500 hPa中高纬为两槽一脊。低纬度地区有短波槽活动,700 hPa低空急流明显,地面处于冷锋前。低空急流、地面冷锋均有利于冰冻雨雪天气发生,且积冰过程中均有良好的温湿条件,并都伴有降水发生,这些条件都为积冰形成提供了良好的动力及热力条件。而2008年积冰过程大气温度垂直结构存在暖层,是造成两次过程形成机制不同的原因之一。Two icing cases happened on 500-kV high voltage transmission lines in Hubei Province during February 25-26, 2008 and January 5-9, 2009. Study showed that the circulation patterns in both cases are similar： there were two troughs and a ridge in high latitudes, a short-wave trough in low lati- tudes at 500 hPa, a low-level jet at 700 hPa, and a surface cold front. The low-level jet and surface cold front were conducive to the occurrence of freezing rain and snows. Also, icing processes involved precipi- tation, certain temperature and humidity conditions. These conditions provided good potential and thermal conditions for the formation of icing. A warm layer existed in the vertical temperature structure of the at- mosphere in the 2008 case, but not in the 2009 case. This resulted in the difference in formation mecha- nisms of the two cases.

关 键 词：高压电线结冰 大气层结特征 温湿条件 气象成因 

分 类 号：P426.67[天文地球—大气科学及气象学]