Estimating tidally driven mixing in the deep ocean
Estimating tidally driven mixing in the deep ocean
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DOI：
10.1029/2002gl015633
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发表时间：
2002-12
影响因子：
5.2
通讯作者：
L. S. Laurent;H. Simmons;S. Jayne
中科院分区：
文献类型：
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作者：
L. S. Laurent;H. Simmons;S. Jayne
使用潮汐流体动力学模型中的内波能量通量的参数化，我们估计了可用于增强湍流混合的潮汐能的全局分布。对于内潮汐以湍流形式耗散能量的区域，建立了垂直混合扩散率的关系。我们假设 30 ± 10% 的内潮能通量在产生地点附近以湍流形式消散，这与基于大洋中脊地点微观结构观测的估计一致。以与这些观察结果一致的方式对增强的混合水平进行建模以远离地形衰减。参数化扩散率与观测到的深海混合率相似，估计的不确定性与与预算和微观结构方法相关的标准误差相当。
Using a parameterization for internal wave energy flux in a hydrodynamic model for the tides, we estimate the global distribution of tidal energy available for enhanced turbulent mixing. A relation for the diffusivity of vertical mixing is formulated for regions where internal tides dissipate their energy as turbulence. We assume that 30 ± 10% of the internal tide energy flux dissipates as turbulence near the site of generation, consistent with an estimate based on microstructure observations from a mid‐ocean ridge site. Enhanced levels of mixing are modeled to decay away from topography, in a manner consistent with these observations. Parameterized diffusivities are shown to resemble observed abyssal mixing rates, with estimated uncertainties comparable to standard errors associated with budget and microstructure methods.