Vertical Velocity in the Gray Zone
Vertical Velocity in the Gray Zone
复制标题
灰色区域的垂直速度
DOI：
10.1002/2017ms001059
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发表时间：
2016
影响因子：
6.8
通讯作者：
N. Jeevanjee
中科院分区：
文献类型：
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作者：
N. Jeevanjee
我们使用GFDL的FV3动力核心的静力和非静力版本，以及运动方程的解析解，描述了对流垂直速度WC在水平分辨率的“灰色区域”中的变化。我们给出了一个简单的模式解对流的判据(基于块几何)，发现WC的收敛需要O(100 m)的分辨率。我们还发现，无论是在数值上还是在解析上，流体静力学系统都高估了WC值，在对流分辨区域高估了2-3倍。这种高估被简单地理解为Jeevanjee和Romps(2015-2016)的“有效浮力压力”。
We describe how convective vertical velocities wc vary in the “gray zone” of horizontal resolution, using both hydrostatic and nonhydrostatic versions of GFDL's FV3 dynamical core, as well as analytical solutions to the equations of motion. We derive a simple criterion (based on parcel geometries) for a model to resolve convection, and find that O(100 m) resolution can be required for convergence of wc . We also find, both numerically and analytically, that hydrostatic systems overestimate wc , by a factor of 2–3 in the convection‐resolving regime. This overestimation is simply understood in terms of the “effective buoyancy pressure” of Jeevanjee and Romps (2015, 2016).