东北冷涡强度定义及特征分析  

Definition and characteristics analysis of the intensity of Northeast Cold Vortex

作　　者：胡鹏宇 陈传雷 林海峰 徐爽 孔令军 刘青[3] 纪永明 赵梓淇[5] HU Peng-yu;CHEN Chuan-lei;LIN Hai-feng;XU Shuang;KONG Ling-jun;LIU Qing;JI Yong-ming;ZHAO Zi-qi(Liaoning Meteorological Disaster Monitoring and Early Warning Center,Shenyang 110166,China;Shenyang Central Meteorological Observatory,Shenyang 110166,China;Shenyang Meteorological Administration,Shenyang 110168,China;Xingcheng Meteorological Service,Xingcheng 125100,China;Institute of Atmospheric Environment,China Meteorological Administration,Shenyang 110166,China)

机构地区：[1]辽宁省气象灾害监测预警中心,辽宁沈阳110166 [2]辽宁省气象台,辽宁沈阳110168 [3]沈阳市气象局,辽宁沈阳110168 [4]兴城市气象局,辽宁葫芦岛125100 [5]中国气象局沈阳大气环境研究所,辽宁沈阳110166

出　　处：《气象与环境学报》2021年第6期100-105,共6页Journal of Meteorology and Environment

基　　金：辽宁省气象局科学技术项目(BA201809和2021SXB02);沈阳市气象局科学技术项目(SY202102)共同资助。

摘　　要：利用NCEP 1°×1°格点再分析资料,根据东北冷涡温度场有冷中心及高度场是闭合环状环流的特征,同时选取位势高度差和温度差两个指标,制定东北冷涡逐日强度定义方法,并分析了按此定义划分的不同强度东北冷涡的变化特征。结果表明:中等强度冷涡的出现频次最多,占全年冷涡出现日数的50%以上,其次是弱冷涡,超强冷涡出现日数最少;弱冷涡生命史约为3 d左右;超强冷涡活动期间中心位移变化较大,且生命史长,影响范围更为广泛。Using the NCEP 1°×1°grid reanalysis data,according to the characteristics of temperature field having a cold center and the height field being a closed annular circulation of the Northeast Cold Vortex,two indexes of geopotential height difference and temperature difference were selected to formulate the definition method of the daily intensity of Northeast Cold Vortex and analyze the change characteristics of the Northeast Cold Vortex with different intensities divided by this definition.The results show that the occurrence frequency of medium-strength cold vortices is the highest,accounting for more than 50%of the annual number of days of cold vortices,followed by weak cold vortices,and the number of days of super-strong cold vortices is the least.The life history of weak cold vortices is about 3 days.During the super cold vortex activity,the center displacement changes greatly,and the life history is long,and the range of influence is wider.

关 键 词：冷涡强度 冷涡中心位移 冷涡持续日数 

分 类 号：P467[天文地球—大气科学及气象学]