大连地区寒潮强风天气的数值模拟研究  

Study on Numerical Simulation of the Strong Gale of Cold Wave in Dalian Area

作　　者：李燕[1] 张彩凤[1] 赵惠芳 王锡军[1] 

机构地区：[1]大连市气象局,辽宁大连116001 [2]福建省晋江市气象局,福建晋江362200

出　　处：《安徽农业科学》2010年第4期1893-1898,1901,共7页Journal of Anhui Agricultural Sciences

基　　金：大连市科技局2004年科技计划项目(2004B3SF183)

摘　　要：利用常规资料、自动站资料以及中尺度数值模式(MM5V3)对2007年3月4～5日大连地区出现的极端寒潮大风天气进行了分析。结果表明,这次极端寒潮大风天气是北方冷空气东南移形成强冷锋与北上强江淮气旋共同作用造成的。强冷空气在下沉气流作用下,在大连上游即渤海中低层形成强干冷中心,低空有强负涡度、强辐散,高空有强正涡度、强辐合,有利于地面冷高压及冷锋的加强;大连东部低空有强正涡度、强辐合,高空有强负涡度、强辐散,有利于气旋加强发展;强高压、强冷锋配合罕见的强大气旋,从地面到850hPa形成明显的西边强高压、东边特强气旋的形势,这是出现寒潮强风天气非常有利的因素,这种西高东低形势形成的强气压梯度区自西向东经过大连地区,造成大连地区罕见的寒潮强风天气。According to conventional data and automatic weather station data,the extreme cold-windy weather in Dalian Area from March 4th to 5th in 2007 were analyzed by the mesoscale numerical model（MM5V3）.The results showed that the extreme cold-windy weather was caused by the interaction between strong cold front due to cold air from the north to the southeast and strong Jianghuai cyclone which moved to the north.By the action of sinking airflow,strong cold air was accumulated in the middle and low level in the upstream region of Dalian,and formed a strong cold and dry center.There was a strong negative vorticity and strong divergence in the low level,a strong positive vorticity and strong convergence in the high level.This situation was conducive to strengthening surface cold high and cold front.In the eastern part of Dalian,there was a strong positive vorticity and strong convergence in the low level,a strong negative vorticity and strong divergence in the high level.This situation was conducive to enhancing the development of cyclone.There was a strong high pressure in the west side and an exceptionally strong cyclone in the east side from the ground surface to the altitude of 850 hPa.This situation was very favorable to form the strong gale of the cold wave.From west to east through Dalian region,the strong pressure gradient resulted in the rare gale weather of the cold wave in Dalian.

关 键 词：寒潮大风 冷锋 江淮气旋 冷空气 数值模拟 

分 类 号：S162[农业科学—农业气象学]