2006年川渝大旱环流异常特征的动力学诊断  

Dynamic Diagnosis on Anomalous Circulation Characteristics of the Drought in Sichuan and Chongqing in 2006

作　　者：江颖 隆霄[2] 邹小松 周国兵 孟晓文 杨子凡[6] JIANG Ying;LONG Xiao;ZOU Xiaosong;ZHOU Guobing;MENG Xiaowen;YANG Zifan(Fuzhou Meteorological Bureau,Fuzhou 350008,China;School of Atmospheric Science,Lanzhou University,Lanzhou 730000,China;Minqin Meteorological Bureau,Minqin 350800,China;Chongqing Meteorological Bureau,Chongqing 401147,China;Meteorological observatory of PLA95810,Beijing 100076,China;Jiuquan Satellite Launch Center,Jiuquan 735000,China)

机构地区：[1]福州市气象局,福建福州350008 [2]兰州大学大气科学学院,甘肃兰州730000 [3]福州市闽清县气象局,福建闽清350800 [4]重庆市气象台,重庆401147 [5]中国人民解放军95810部队气象台,北京100076 [6]酒泉卫星发射中心,甘肃酒泉735000

出　　处：《沙漠与绿洲气象》2020年第5期92-98,共7页Desert and Oasis Meteorology

基　　金：国家自然科学基金(41330527)。

摘　　要：利用2006—2011年夏季(7—9月)全球每6 h一次的0.25°×0.25°欧洲中心数据(ERAinterim)和同时段重庆地区的常规观测资料,对2006年夏季川渝干旱的环流异常特征进行了诊断分析。结果表明:(1)与2007—2011年夏季平均环流、水汽通量散度等物理量的对比分析显示,2006年同期的这些物理量异常分布特征明显,有利于川渝地区干旱异常事件的维持和发展。(2)2006年川渝地区7月1日—9月14日300 hPa位涡的逐日变化显示,位涡的纬向分布特征明显,出现"正—负—正"的变化特征,这与西太平洋副热带高压进入和退出川渝地区有较好的对应关系。(3)500 hPa平均局地涡度拟能积分和局地涡度拟能平流的逐日演变表明:在川渝干旱异常事件的形成和结束阶段,局地环流变化明显,涡度拟能及其平流均也发生明显变化。局地涡度拟能积分、涡度拟能平流、位涡可以尝试作为干旱异常天气系统发展演变的诊断因子。We analyzed dynamic characteristics about anomalous circulation of the drought of Sichuan and Chongqing area in summer of 2006 with ERA-interim 0.25°×0.25°data from July 1 st to September 30 th in 2006-2011 and routing observational data in Chongqing.The result shows that:(1)the average circulation,water vapor flux divergence in the summer of 2007-2011 shows that the distribution characteristics of these physical quantities during the same period of 2006 are conductive to the anomalous drought in Sichuan and Chongqing.(2)According to the time-longitude evolving graph of the potential vorticity on 30°N at 300 hPa from July 1 st to September 15 th 2006,the horizontal PV distribution obviously shows positive-negative-positive characteristics,which finely corresponds the entry and exit of the western Pacific subtropical high into the Sichuan-Chongqing region.(3)The daily evolution of integral region enstrophy and advection of enstrophy at 500 hPa shows that these quantities and local circulation have significant variation at the formation and end stage of the drought event.This may mean that integral region enstrophy,advection of enstrophy and potential vorticity can be used as diagnostic factors for weather system evolution of drought event.

关 键 词：干旱 环流 涡度拟能平流 位涡 川渝地区 

分 类 号：P339[天文地球—水文科学] S165.25[水利工程—水文学及水资源]