Anisotropic Rotational and Isotropic Residual Isopycnal Mesoscale Eddy Fluxes
Anisotropic Rotational and Isotropic Residual Isopycnal Mesoscale Eddy Fluxes
复制标题
各向异性旋转和各向同性残余等密度中尺度涡流
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
C. Eden
中科院分区：
文献类型：
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作者：
C. Eden
在广义时间残差均值(TRM-G)框架下，定义了双日旋转涡通量，使得残馀散度涡通量与浮力的不可逆变化有关，即只与双日混合(或方差和高阶矩的时间变化)有关。本文讨论了等轴涡通量具有相似的物理意义：旋转等轴涡通量可以在TRM-G中定义，使得通量的剩余发散部分只与平均可用势能的去除和涡能的转移有关，即与涡旋活动的经典图像有关。在两个以强中尺度涡动驱动纬向急流为特征的理想涡旋模式中，大的等轴涡通量在喷流的侧翼循环。然而，残留的等轴面涡流通量主要是经向的，因此是向下的，表明等轴面厚度的各向异性混合消失，这与经典的pi。
Abstract In the generalized temporal residual mean (TRM-G) framework, the diapycnal rotational eddy fluxes are defined such that the residual divergent diapycnal eddy flux is related to irreversible changes of buoyancy, that is, diapycnal mixing (or temporal changes of variance and higher order moments) only. Here, it is discussed that for the isopycnal eddy fluxes a similar physically meaningful property exists: rotational isopycnal eddy fluxes can be defined in TRM-G such that the residual divergent part of the flux is related to removal of mean available potential energy and transfer to eddy energy only, that is, to the classical picture of eddy activity. In two idealized eddying models, both featuring strong mesoscale eddy-driven zonal jets, large isopycnal eddy fluxes are circulating at the flanks of the jets. The residual isopycnal eddy fluxes, however, are predominantly meridional and thus downgradient, indicating vanishing anisotropic mixing of isopycnal thickness, consistent with the classical pi...