一次江淮气旋及其中尺度系统的数值模拟  

NUMERICAL SIMULATION OF A CYCLONE OVER THE JIANGHUAI AREA AND ITS MESOSCALE SYSTEMS

作　　者：肖庆农[1] 章震越 尹德昌[1] 魏绍远[1] 

机构地区：[1]空军气象学院

出　　处：《应用气象学报》1991年第4期346-354,共9页Journal of Applied Meteorological Science

摘　　要：本文在十一层原始方程模式中引入 Fritsch-Chappell一维云模式,对1982年5月12日江淮气旋上中尺度系统进行了模拟试验,分析表明:Fritsch-Chappell一维云模式对深厚积云的考虑细致合理,比郭晓岚积云参数化方案优越,它能模拟出中尺度系统的一些特征。通过数值计算发现:中尺度江淮气旋是对流层低层的天气系统,气压场上具有中尺度低压的某些特征;对流天气的出现,使得中尺度江淮气旋得到发展,但这种发展有一个变化过程,在对流发展加强时,对流引起的动量变化以及下沉气流造成的低层冷却作用,使其有一个暂时的减弱过程,当对流运动趋于减弱时,气旋才得以发展。Fritsch-Chappell's one dimensional cloud model is introduced and incorporated into 11-layerprimitive equation model.The convective parameterization scheme proposed by Kuo(1965)is alsoincoporated into the model used in this psper.The difference between the two schemes is comparedeach other in simulating a mesoscale convective process occurred over the Jianghuai area on 12May 1982.The two numerical simulations indicate that this one dimensional cloud model is betterthan Kuo's scheme.The investigation indicates that the mesoscale cyclone is the weather system occurred in plan-etary boundary layer.The interaction between mesoscale cyclone and convection makes the cy-clone develop.But in the early period of convection,the development of cyclone is limited by in-fluencing of downdraft and cumulus momentum transport and mixing.When convection comes todepress,the mesoscale cyclone develops.

关 键 词：江淮气旋 中尺度系统 中尺度低压 积云对流 原始方程模式 降水中心 对流运动 参数化方案 对流天气 对流过程 

分 类 号：P4[天文地球—大气科学及气象学]