Beyond the rigid lid: Baroclinic modes in a structured atmosphere
Beyond the rigid lid: Baroclinic modes in a structured atmosphere
复制标题
超越刚性盖：结构化大气中的斜压模式
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
D. Romps
中科院分区：
文献类型：
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作者：
J. P. Edman;D. Romps
摘要斜压模式分解因其简单性和在理解各种大气现象方面的明显有用性而成为热带动力学文献的固定内容。然而，它的推导依赖于对流层顶是一个刚性盖子的假设，它人为地限制了波能的垂直传播。这导致单垂直模式的对流层浮力异常在没有耗散的情况下始终保持一致。在这里，我们推导了被平流层覆盖的二维对流层（或者等效地，具有一种平移对称性的三维对流层）中这些斜压模式的格林函数。这些格林函数量化了水平局部加热产生的重力波的传播和扩散，它们可用于重建任何对流层加热的演化。对于特征宽度为 100 的第一斜斜二维右移或左移重力波...
AbstractThe baroclinic-mode decomposition is a fixture of the tropical-dynamics literature due to its simplicity and apparent usefulness in understanding a wide range of atmospheric phenomena. However, its derivation relies on the assumption that the tropopause is a rigid lid, which artificially restricts the vertical propagation of wave energy. This causes tropospheric buoyancy anomalies of a single vertical mode to remain coherent for all time in the absence of dissipation. Here, we derive the Green’s functions for these baroclinic modes in a two-dimensional troposphere (or, equivalently, a three-dimensional troposphere with one translational symmetry) that is overlain by a stratosphere. These Green’s functions quantify the propagation and spreading of gravity waves generated by a horizontally localized heating, and they can be used to reconstruct the evolution of any tropospheric heating. For a first-baroclinic two-dimensional right-moving or left-moving gravity wave with a characteristic width of 100 ...