主办单位:中国气象局沈阳大气环境研究所
国际刊号:ISSN 1673-503X
国内刊号:CN 21-1531/P

气象与环境学报 ›› 2014, Vol. 30 ›› Issue (4): 9-18.doi:

• 论 文 • 上一篇    下一篇

一次东北冷涡不同阶段强对流天气特征对比分析

应爽  袁大宇2   李尚锋3   

  1. 1. 长春市气象局,吉林 长春 130051;2. 吉林省气象局,吉林 长春 130062;3. 吉林省气象科学研究所,吉林 长春 130062
  • 出版日期:2014-08-30 发布日期:2014-08-30

Comparative analysis of severe convective weather characteristics in different stages of Northeast China cold vortex

YING ShuangYUAN Da-yu 2  LI Shang-feng 3   

  1. 1. Changchun Meteorological Service, Changchun 130062, China; 2. Jilin Meteorological Service, Changchun 130062, China; 3. Institute of Meteorological Sciences of Jilin Province, Changchun 130062, China
  • Online:2014-08-30 Published:2014-08-30

摘要:

利用NCAR/NCEP再分析(1?×1?)资料、区域自动站观测、FY-2D/2E卫星观测和GPS/MET水汽监测等资料,对2012年6月7—18日长春地区发生在同一东北冷涡系统不同演变阶段的3次强对流天气进行对比诊断分析。结果表明:在冷涡形成期,高低空急流耦合产生的次级环流上升支,触发锋前不稳定能量释放,导致中β尺度孤立深厚湿对流系统出现;在冷涡发展期,对流层高层干冷空气向对流层中下层侵入,形成高空露点锋,触发有组织的中α尺度对流系统;在冷涡消亡期,低涡减弱为高空槽并快速东移,其后部冷空气置于低层大范围暖湿空气之上,地面中尺度辐合触发不稳定能量释放,形成中β尺度对流系统。

关键词: 东北冷涡, 强对流天气, 中尺度对流系统

Abstract:

 Using the NCEP/NCAR reanalysis data with 1?×1? spatial resolution, meteorological data from regional automatic weather stations (AWS), FY-2D/2E satellite image and GPS/MET data, three severe convective weather events in different stages of Northeast China cold vortex on June 7 to 18, 2012 over Changchu area were diagnosed and compared. The results show that during the forming stage of Northeast China cold vortex, an isolated-deep-moist convection of meso-β-scale is triggered by the ascending branch of secondary circulation induced by coupled high/low jets. During the developing stage of Northeast China cold vortex, a convective system of meso-α-scale is triggered by invasion of dry-cold air from upper to middle and lower troposphere, so forms an upper dew point front at the same time. During the weakening stage of Northeast China cold vortex, a convective system of meso-β-scale is formed by the weakening of Northeast China cold vortex to an upper trough moving eastward, whose rear part is cold air above the large range of low-level warm and moist air, and surface meso-scale converges in the same time.

Key words:  Northeast China cold vortex, Severe convective weather, Meso-scale convective system