The Relation between Baroclinic Adjustment and Turbulent Diffusion in the Two-Layer Model
The Relation between Baroclinic Adjustment and Turbulent Diffusion in the Two-Layer Model
复制标题
两层模型中斜压调整与湍流扩散的关系
DOI：
10.1175/jas3886.1
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发表时间：
2007
影响因子：
3.1
通讯作者：
P. Zurita‐Gotor
中科院分区：
文献类型：
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作者：
P. Zurita‐Gotor
摘要 斜压调整和湍流扩散是用于描述两层模型中涡流平均流动闭合的两种流行范式，对系统的临界性具有非常不同的含义。斜压调整假定存在首选平衡状态，而湍流扩散框架则预测平均状态随强迫的平滑变化。这项研究调查了每个范式在广泛的参数空间上的相关性，包括非绝热强迫的非常强烈的变化。结果证实了斜压调整研究指出的临界点对强迫变化的敏感性较弱，但不支持首选平衡状态的存在。当强迫变化时平均状态的弱敏感性与均匀湍流理论预测的扩散闭合的陡度一致。这些动荡的预测已经根据观察到的经验扩散、扩展进行了局部测试……
Abstract Baroclinic adjustment and turbulent diffusion are two popular paradigms used to describe the eddy–mean flow closure in the two-layer model, with very different implications for the criticality of the system. Baroclinic adjustment postulates the existence of preferred equilibrium states, while the turbulent diffusion framework predicts smooth variations of the mean state with the forcing. This study investigates the relevance of each paradigm over a wide range of the parameter space, including very strong changes in the diabatic forcing. The results confirm the weak sensitivity of the criticality against changes in the forcing noted by baroclinic adjustment studies but do not support the existence of preferred equilibrium states. The weak sensitivity of the mean state when the forcing is varied is consistent with the steepness of the diffusive closure predicted by homogeneous turbulence theories. These turbulent predictions have been tested locally against observed empirical diffusivities, extendi...