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Isoneutral Control of Effective Diapycnal Mixing in Numerical Ocean Models with Neutral Rotated Diffusion Tensors by Hochet, Antoine; Tailleux, Remi; Ferreira, David; Kuhlbrodt, Till is a scholarly article available to read on EtoBox.

What is Isoneutral Control of Effective Diapycnal Mixing in Numerical Ocean Models with Neutral Rotated Diffusion Tensors about?

The current view about the mixing of heat and salt in the ocean is that it should be parameterised by means of a rotated diffusion tensor based on mixing directions parallel and perpendicular to the local neutral vector. However, the impossibility to construct a density variable in the ocean that is exactly neutral because of the coupling between thermobaricity and density-compensated temperature/salinity anomalies implies that the effective diapycnal diffusivity experienced by any possible density variable is partly controlled by isoneutral diffusion when using neutral rotated diffusion. Here, this effect is quantified by evaluating the effective diapycnal diffusion coefficient for five widely used density variables: Jackett and McDougall (1997) $\gamma^n$, Lorenz reference state density $\rho_{ref}$ of Winters et al. (1996), Saenz et al. (2015), and three potential density variables $\sigma_0$, $\sigma_2$ and $\sigma_4$.Computations use the World Ocean Circulation Experiment climatology, assuming either a uniform value for isoneutral mixing or spatially varying values inferred from an inverse calculation. Isopycnal mixing contributions to the effective diapycnal mixing yields val

Author

Hochet, Antoine; Tailleux, Remi; Ferreira, David; Kuhlbrodt, Till

Published

2017

Language

EN