19930505金昌特强沙尘暴爆发诱因再分析  

Further Analyses of Causes of Duststorm Explosions in Jinchang on 5 May,1993

作　　者：宋敏红 钱正安 蔡英 SONG Minhong;QIAN Zheng’an;CAI Ying(School of Atmospheric Sciences,Chengdu University of Information Technology/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,Chengdu 610225,Sichuan,China;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China)

机构地区：[1]成都信息工程大学大气科学学院/高原大气与环境四川省重点实验室,四川成都610225 [2]中国科学院西北生态环境资源研究院,甘肃兰州730000

出　　处：《高原气象》2020年第5期1102-1109,共8页Plateau Meteorology

基　　金：成都信息工程大学科研基金项目(KYTZ201721);中国气象局数值模式发展专项(QHMS2018018,QHMS2019016)。

摘　　要：为了更好地认识和理解19930505中国金昌和国内外其他相关沙尘暴事件,从全球视野,充分利用卫星云图、金昌站地面气压跃升峰等诸要素剧变等资料,综合剖析、讨论了这些相关沙尘暴过程。研究表明:(1)19930505金昌沙尘暴是先由“干飑线”触发,再由其后冷锋追赶上,金昌沙尘暴二度加强的“干飑线+低压冷锋”混合型特强沙尘暴;(2)金昌沙尘暴前先出现了强锋生及强热力不稳定等飑线预兆;接着,出现了金昌站地面气压跃升峰等典型飑线特征;最后,飑线积云单体云柱左后方中下层的下曳气流强风也为地面起沙提供了动力,故出现金昌飑线并触发这次沙尘暴是合理的;(3)在湿润区和半干旱区飑线时,地面气压跃升峰强,雷阵雨强,飑线强;而在干旱区飑线时则反之,地面气压跃升峰弱,对流天气也弱。即:水汽多(少)确有加强(减弱)湿润、半干旱区(干旱区)飑线或沙尘暴的作用。To better know and understand the Jinchang duststorm case and other related ones worldside,the paper further analyzes and discusses these related duststorm processes,fully utilizing the satellite images,surface pressure curves,etc.The main conclusions are as follows:(1)Under the weather situation of cold front invasion from Northwest track,the duststorm was,firstly,induced by the Jinchang squall line in the front of the cold front;then about 40 minutes later the cold front in the rear catch speedy with the squall line and the storm strengthens again.Namely the duststorm is caused by both the dry squall line and cold front,and has never seen in Jinchang,China before.(2)Before the squall line forms there is occurring the signals such as strong thermal unstable and surface pressure falling rate.After squall line forms,there is occurring the features as the pressure rise peak,strong down drought in the near surface and narrow-and white-bright cumulus cold belt as well.Shortly,the squall line forms,induces the duststorm in Jinchang,and is reasonable also.(3)It seemly that the squall line can occur under any dry and wet arrangements.Certainly,the water vapor condition has partly impact of for strengthening(weakening)the squall lines in semidry-and wet-(dry-)arrangement.

关 键 词：金昌沙尘暴 低压冷锋天气型 飑线 雷暴对流 水汽影响 

分 类 号：P445+.4[天文地球—大气科学及气象学]