环境气流及非绝热加热对热带气旋结构和移动的影响  

THE IMPACT OF BASIC FLOW AND DIABATIC HEATING ON MOTION AND STRUCTURE OF TROPICAL CYCLONE

作　　者：陈涛 毕宝贵 

机构地区：[1]国家气象中心,北京100081

出　　处：《热带气象学报》2004年第5期530-536,共7页Journal of Tropical Meteorology

摘　　要：设计一个三层的准地转斜压模式,研究了不同结构环境气流和环境非绝热加热场中热带气旋移动路径和结构的特征。数值试验的结果表明:(1)无外界影响下热带气旋向西北方向移动,垂直速度场有明显的螺旋结构;(2)热带气旋主要受基本环境气流引导,非对称环流中的小扰动干扰了热带气旋的移动;(3)非绝热加热场对热带气旋影响较大,热带气旋有向加热中心移动的倾向,同时热带气旋的水平、垂直结构都有较大的变化。An quasi-geostropical baroclinic three-layered model is constructed for studying the motion and structure of tropical cyclone given various basic flow and diabatic heating. Results of numerical experiments explain the phenomenon that: (1) Tropical cyclone is moving toward northwest without the impact of basic flow and diabatic heating, and there is spiral structure in vertical velocity field. (2) Tropical cyclone is mainly steered by basic flow, but there is difference between the direction of basisc flow and movement of tropical cyclone, which may be explained by the disturbance of asymmetric circulation and ventilation flow between β-gyres. (3) Diabatic heating exerts influence on the motion of tropical cyclone, which is inclined to move towards the center of the heating field. Introducing diabatic heating into the model results in variations of horizonal and vertical structure of tropical cyclone.

关 键 词：热带气旋 移动路径 斜压模式 

分 类 号：P435[天文地球—大气科学及气象学]