Vertical heat transport in eddying ocean models
Vertical heat transport in eddying ocean models
复制标题
涡流海洋模型中的垂直热传输
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
M. Maltrud
中科院分区：
文献类型：
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作者：
C. L. Wolfe;P. Cessi;J. McClean;M. Maltrud
中尺度涡旋对海洋垂直热输送的影响，使用两个涡解数值模式。平均气流和扩散的全球热输送都是向下的，并由向上的涡动热通量平衡。平均和涡动平流热通量占主导地位的副极地地区，而扩散通量是重要的，主要是在副热带。在亚热带深渊，平均平流热通量由涡动和扩散通量的组合平衡，经典的Munk型平流-扩散热平衡必须修改。Munk和Wunsch（1998）的垂直湍流扩散系数表达式在主温跃层底部附近高估了扩散系数，其数值高达4倍。这意味着Munk和Wunsch（1998）确定的闭合纬向翻转环流所需的混合可能是由于忽略了中尺度涡旋而高估的。
The effect of mesoscale eddies on the vertical heat transport of the ocean is examined using two eddy‐resolving numerical models. The global heat transport by the mean flow and diffusion are both downwards and are balanced by an upward eddy heat flux. Mean and eddy advective heat fluxes dominate the subpolar regions, while diffusive flux is important primarily in the subtropics. In the subtropical abyss, the mean advective heat flux is balanced by a combination of eddy and diffusive fluxes and the classical Munk‐type advective‐diffusive heat balance must be modified. The Munk and Wunsch (1998) expression for the vertical turbulent diffusivity over‐estimates the diffusivity by as much as a factor of four near the base of the main thermocline. This implies that the mixing required to close the meridional overturning circulation determined by Munk and Wunsch (1998) may be an over‐estimate due to the neglect of mesoscale eddies.