| 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 |
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| 引用本文： | 宋晓亮,陆汉城.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[J].大气科学,2001,25(4):503-514. |
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| 作者姓名： | 宋晓亮 陆汉城 |
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| 作者单位： | 解放军理工大学气象学院,南京 211101 |
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| 基金项目： | 国家自然科学基金资助项目49875009 |
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| 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.
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| 关 键 词： | 数值模式 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 |
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| Song Xiaoliang and Lu Hancheng.Design of a Non-Hydrostatic Model Suitable for Deep Moist Slantwise Convection and Numerical Study of the Conditional Symmetric Instability[J].Chinese Journal of Atmospheric Sciences,2001,25(4):503-514. |
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| Authors: | Song Xiaoliang and Lu Hancheng |
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| Abstract: | 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. |
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| Keywords: | numerical model conditional symmetric instability numerical study |
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