Equilibration of Baroclinic Turbulence in Primitive Equations and Quasigeostrophic Models
Equilibration of Baroclinic Turbulence in Primitive Equations and Quasigeostrophic Models
复制标题
原始方程和准地转模型中斜压湍流的平衡
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
G. Vallis
中科院分区：
文献类型：
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作者：
P. Zurita‐Gotor;G. Vallis
摘要本文研究了斜压湍流在理想的原始方程二能级模型中的平衡问题，重点讨论了其与准等转湍流理论现象学的关系。采用两层拟地转模型进行模拟比较，拟地转模型中的变形半径采用原始方程模型的分层来设定。在相当宽的参数范围内，原始方程和准地转结果在定性上和一定程度上在定量上是一致的，与地转湍流的现象学是一致的。旋涡的规模、振幅和斜压性以及平均气流的斜压不稳定性都随所施加的参数变化得相当平稳；在某些参数范围内，这两种模型都能产生超临界流。在没有对流参数化方案的原始方程模型中，临界性是不成立的。
Abstract This paper investigates the equilibration of baroclinic turbulence in an idealized, primitive equation, two-level model, focusing on the relation with the phenomenology of quasigeostrophic turbulence theory. Simulations with a comparable two-layer quasigeostrophic model are presented for comparison, with the deformation radius in the quasigeostrophic model being set using the stratification from the primitive equation model. Over a fairly broad parameter range, the primitive equation and quasigeostrophic results are in qualitative and, to some degree, quantitative agreement and are consistent with the phenomenology of geostrophic turbulence. The scale, amplitude, and baroclinicity of the eddies and the degree of baroclinic instability of the mean flow all vary fairly smoothly with the imposed parameters; both models are able, in some parameter ranges, to produce supercritical flows. The criticality in the primitive equation model, which does not have any convective parameterization scheme, is fai...