二维非静力平衡深厚湿倾斜对流数值模式设计与条件性对称不稳定数值试验  

Design of a Non-Hydrostatic Model Suitable for Deep Moist Slantwise Convection and Numerical Study of the Conditional Symmetric Instability

作　　者：宋晓亮[1] 陆汉城[1] 

机构地区：[1]解放军理工大学气象学院,南京211101

出　　处：《大气科学》2001年第4期503-514,共12页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金资助项目49875009

摘　　要：设计了一个宜于研究深厚湿倾斜对流运动的二维非弹性非静力平衡数值模式。模式采用非静力平衡条件、非常值湍流扩散系数，并具有最优协调分辨率，弥补了以往条件性对称不稳定数值研究中的诸多缺陷。数值试验表明：模式运行稳定可信且对深厚湿倾斜对流运动有较强的描述能力、在条件性对称不稳定条件下，扰动发展呈现为强倾斜环流特征，垂 直速度场有狭窄的强倾斜上升运动，与倾斜上升运动相伴有倾斜云带发展。诊断分析表明： 在扰动发展演化过程中，条件性对称不稳定演化为一种混合不稳定的形式存在。A two-dimensional non-hydrostatic model is designed to suit with deep moist slantwise convection. The most sophisticated parts of model include: (1) the use of non-hydrostatic model, (2) the use of consistency vertical and horizontal resolutions, (3) the use of variable diffusion coefficients. From the conditional symmetric instability (CSI) numerical experiment we draw main conclusions as follows: A typical slantwise roll of CSI appears in the meridional plane. A strong slantwise updraft layer appears accompanying downdraft layers above and below. A slantwise cloud is formed and sustained along the updraft region of CSI. Mixed-instability is formed because of the development of CSI.

关 键 词：条件性对称不稳定 数值试验 二维非静力平衡条件 湿倾斜对流数值模式 湍流 

分 类 号：P435[天文地球—大气科学及气象学]