Baroclinic wave packets in models and observations
Baroclinic wave packets in models and observations
复制标题
模型和观测中的斜压波包
DOI：
10.1175/1520-0469(1993)050
复制
发表时间：
1993
影响因子：
3.1
通讯作者：
I. Held
中科院分区：
文献类型：
--
作者：
Sukyoung Lee;I. Held
相干斜压波包存在于南半球，在夏季最为明显。在非线性斜压不稳定性的层次模型中也发现了这些相干包- β-平面上的两层准等转（QG）模型，两层原始方程（PE）模型和一般环流模型。流是混沌的，但是数据包本身可以保持显著的一致性，尽管数据包内的流有复杂的演变。在QG和PE模型中，随着流的超临界性降低，数据包变得更加健壮。在模型和观测中，包以大于单个扰动的相速度的群速度移动，因此这些扰动呈现下游发展。包中斜压波的结构作为经度的函数类似于正弦斜压波的生命周期作为时间的函数。一个域中可以同时存在多个报文。在…
Abstract Coherent baroclinic wave packets are present in the Southern Hemisphere, most clearly in the summer season. These coherent packets are also found in a hierarchy of models of nonlinear baroclinic instability-a two-layer quasigeostrophic (QG) model on a β-plane, a two-level primitive equation (PE) model, and a general circulation model. The flows are chaotic, but the packet itself can remain remarkably coherent, despite the complex evolution of the flow within the packet. In both QG and PE models, the packets become more robust as the supercriticality of the flow is reduced. In both models and the observations, the packets move with a group velocity that is greater than the phase speed of the individual disturbances, so that these disturbances exhibit downstream development. The structure of the baroclinic waves in the packet as a function of longitude resembles the life cycles of sinusoidal baroclinic waves as a function of time. More than one packet can exist in the domain at the same time. In th...