Gravity wave refraction by three-dimensionally varying winds and the global transport of angular momentum in the atmosphere
Gravity wave refraction by three-dimensionally varying winds and the global transport of angular momentum in the atmosphere
复制标题
DOI：
10.1175/2007jas2561.1
复制
发表时间：
2008-09
期刊：
影响因子：
--
通讯作者：
A. Hasha
中科院分区：
文献类型：
--
作者：
A. Hasha
摘要 GCM 中的操作重力波参数化方案是柱状的；也就是说，它们基于重力波传播的射线追踪模型，该模型忽略了水平传播以及水平不均匀基本流的折射。尽管这些近似提供了巨大的概念和数值简化，但从未明确确定水平传播和折射对于大气气候动力学是否确实可以忽略不计。在这项研究中，制定了一种内部重力波的三维射线追踪方案，该方案允许球面几何中的波折射和水平传播。讨论了与三维波浪动力学和波均相互作用有关的各种问题，然后将该方案应用于使用 GCM 数据和由地形波的可操作柱状重力波参数化方案提供的发射谱的离线计算。这允许并行测试和评估动量流...
Abstract Operational gravity wave parameterization schemes in GCMs are columnar; that is, they are based on a ray-tracing model for gravity wave propagation that neglects horizontal propagation as well as refraction by horizontally inhomogeneous basic flows. Despite the enormous conceptual and numerical simplifications that these approximations provide, it has never been clearly established whether horizontal propagation and refraction are indeed negligible for atmospheric climate dynamics. In this study, a three-dimensional ray-tracing scheme for internal gravity waves that allows wave refraction and horizontal propagation in spherical geometry is formulated. Various issues to do with three-dimensional wave dynamics and wave–mean interactions are discussed, and then the scheme is applied to offline computations using GCM data and launch spectra provided by an operational columnar gravity wave parameterization scheme for topographic waves. This allows for side-by-side testing and evaluation of momentum fl...