辽宁“11·24”强寒潮过程分析  

Causes of the Strongest Cold Wave Process over Liaoning Province On November 24^(th) of 1999

作　　者：阎琦[1] 崔锦[2] 赵梓淇[2] 李爽[1] 杨青[1] YAN Qi;CUI Jin;ZHAO Ziqi;LI Shuang;YANG Qing(Shenyang Central Meteorological Observatory,Shenyang 110166,China;Institute of Atmospheric Environment,China Meteorological Administration,Shenyang 110166,China)

机构地区：[1]辽宁省气象台,辽宁沈阳110166 [2]中国气象局沈阳大气环境研究所,辽宁沈阳110166

出　　处：《沙漠与绿洲气象》2019年第1期39-43,共5页Desert and Oasis Meteorology

基　　金：国家重点研发计划项目(2018YFC1507305);辽宁省气象局重点科研项目(201802);中国气象局预报员专项(CMAYBY2016-015);2019年项目"锋生对2018年两次北上台风暴雨形成作用的对比分析"共同资助

摘　　要：1999年11月24日辽宁省出现近46 a最强寒潮过程,利用常规气象观测资料及NCEP再分析资料,对此次寒潮过程的成因进行分析。结果表明:1999年11月24日辽宁各地24 h最低气温普遍下降10℃以上,鞍山和铁岭等部分地区24 h最低气温下降22℃,降温幅度大且覆盖范围广,是辽宁地区罕见的强寒潮。此次寒潮过程冷空气主要源自新地岛以东的极地,寒潮酝酿阶段差动涡度平流、差动温度平流有利于寒潮地面高压强烈发展并向东偏南方向移动,横槽南压是引导冷空气爆发的环流形势。对1999年的"11·24"寒潮成因初步分析发现:西北路、超极地和西路3路冷空气的共同影响有利于冷空气大量堆积;中低层冷空气、锋区、地面高压强度均强于其他寒潮过程;前期暖气团和后期超强冷空气共同作用,强升温后骤然降温导致最强寒潮出现。The strongest cold wave event in recent 46 years in Liaoning Province occurred on November 24^th of 1999,based on the regular observation data and the NCEP reanalysis data,we analyzed the cause of the extremely cold wave.The results show that temperature decreased 22℃ in the region of Anshan and Tieling and decreased over 10℃ in the other region of whole Liaoning Province,the cooling range and coverage of cold wave was rare in Liaoning Province.The cold air came from the polar pigeons of the east of Novaya Zemlya.Differential vorticity and temperature advection were benefit to the southeast motion and strengthening of trough at high level and high pressure at surface in gestation stage.The westward movement of cross trough was the circulation pattern leading to cold wave outbreak.The causes of the extreme of the cold wave are analyzed initially,the results show that the common influence of cold air on northwest path,super polar path and western path is beneficial to the accumulation of cold air in large quantities.The intensities of cold air in middle and lower layer,front and ground high pressure were more stronger than the other cold waves.The sudden cooling after intense warming led to the emergence of the strongest cold wave.All above factors are the main causes of the super strong cold wave over Liaoning Province on November 24^th of 1999.

关 键 词：寒潮 涡度平流 温度平流 寒潮物理量 

分 类 号：P458.122[天文地球—大气科学及气象学]