摘要
利用NCEP/NCAP再分析资料、辽宁省逐日最低气温和逐日最大风速资料,对2006要2009年影响辽宁地区的区域性寒潮天气进行统计分析,将影响辽宁地区的寒潮冷空气路径归纳为3种（东北路径、西北路径和偏西路径）,本文重点讨论：西北路径冷空气对辽宁地区的影响。结果表明：冷空气从源地到达西西伯利亚地区堆积加强后经内蒙中西部南下到辽宁,造成区域性寒潮天气;受高空槽前强暖平流的影响,寒潮暴发前1~2 d辽宁地区气温普遍回升10益以上;寒潮冷空气从酝酿到暴发阶段500 hPa冷中心的强度基本稳定在-45益左右,寒潮地面冷高压中心强度大多在1 040.0 hPa以上。从环流形势上看,小槽发展型占较大比例。
Based on daily extreme minimum temperature data and maximum wind speed data and as well as NCEP/NCAR reanalysis data,the general features of the cold wave in Liaoning area were analyzed.The cold wave in Liaoning was divided into three paths： northwest path, northeast path and westerly path. The westerly path was further discussed in this paper.The results showed that the cold air from the source southward through central and western Neimenggu to Liaoning and caused regional cold weather in Liaoning after the accumulation and strengthen in West Siberla;The temperatures in Liaoning generally rised above 10 ~C before the outbreaking of cold wave dued to the impact of strong warm advection in the font of upper trough;Temperature of the cold center at 500 hPa basically stable at around -45 % from brewing to the outbreak of the cold wave;The surface cold high center over mostly in 1 040.0 hPa.The pattern of small trough developed accounted for a large proportion in the circulation situation.
出处
《现代农业科技》
2015年第10期239-242,共4页
Modern Agricultural Science and Technology
关键词
寒潮
西北路径
环流形势
辽宁地区
cold wave
the northwest path
the circulation situation
Liaoning Area
