A Modified Approach to Initialize an Idealized Extratropical Cyclone within a Mesoscale Model
A Modified Approach to Initialize an Idealized Extratropical Cyclone within a Mesoscale Model
复制标题
在中尺度模型中初始化理想化温带气旋的改进方法
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
B. Colle
中科院分区：
文献类型：
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作者：
J. Olson;B. Colle
摘要本文介绍了一种用于短期（0-72小时）数值模拟的理想外气旋初始化技术。该方法修改了先前两项研究中的选择方法，以提供对初始旋风结构的更多控制。该技术增加的其他功能包括：1）变形功能，以初始化更真实的低层锋，对流层顶结构，并在高层增强急流最大值; 2）正压切变功能，以帮助发展不同的气旋和锋面几何形状;和3）阻尼功能，以创建一个孤立的斜压波在水平;因此，对于相对较短的模拟，初始化的旋风不受域边界的影响。由于这一过程允许初始化的气旋结构的控制，它可能是有用的锋面和气旋与地形和中尺度可预报性的相互作用的研究。初始化系统产生了各种基本状态和天气扰动，范围很广。
Abstract A technique for initializing realistic idealized extratropical cyclones for short-term (0–72 h) numerical simulations is described. The approach modifies select methods from two previous studies to provide more control over the initial cyclone structure. Additional features added to the technique include 1) deformation functions to initialize more realistic low-level fronts, tropopause structure, and enhanced jet maximum at upper levels; 2) a barotropic shear function to help develop different cyclone and frontal geometries; and 3) damping functions to create an isolated baroclinic wave in the horizontal; therefore, the initialized cyclone is not influenced by the domain boundaries for relatively short simulations. Since this procedure allows for control of the initialized cyclone structures, it may be useful for studies of frontal and cyclone interaction with topography and mesoscale predictability. The initialization system produces a variety of basic states and synoptic disturbances, ranging f...