WTG cloud modeling with spectral decomposition of heating
WTG cloud modeling with spectral decomposition of heating
复制标题
采用加热谱分解的 WTG 云建模
DOI：
10.1002/2014ms000359
复制
发表时间：
2014
影响因子：
6.8
通讯作者：
D. Raymond
中科院分区：
文献类型：
--
作者：
M. J. Herman;D. Raymond
描述了松弛弱温度梯度 (WTG) 近似的修改形式并在云解析模型中实现。在该方案中，垂直加热分布被光谱分解为简正模式。每个模式的弛豫时间尺度设置为与该模式的相应垂直波数成比例，如果重力波负责弛豫，这将是预期的。浮力调整比传统的松弛风力发电机表现出更大的真实性，并且像 Romps 的弱压力梯度模型一样发生非局部调整。此外，使用改进方案时不需要边界层锥度。重新审视文献中的实验；质量通量曲线更加平滑，多重平衡实验更加稳健。
A modified form of the relaxed weak temperature gradient (WTG) approximation is described and implemented in a cloud resolving model. In this scheme, the vertical heating profile is spectrally decomposed into normal modes. The relaxation time scale of each mode is set proportional to the corresponding vertical wave number of the mode, as would be expected if gravity waves were responsible for the relaxation. Buoyancy adjustment exhibits greater realism than in conventional relaxed WTG, with nonlocal adjustment occurring as in the weak pressure gradient model of Romps. Furthermore, no boundary layer taper is needed when using the improved scheme. Experiments from the literature are revisited; mass flux profiles are smoother and multiple equilibrium experiments are more robust.