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Free Content Double-diffusive convection with imposed vertical mass flux

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Vertical advection and double-diffusive convection are both processes affecting the stratification of the oceans. The effect of vertical advection on double-diffusive convection is investigated by considering the situation in which a horizontal layer of fluid has imposed upon it a destabilizing vertical temperature gradient, a stabilizing vertical salinity gradient and a uniform vertical mass flux. The effect of the imposed vertical mass flux is to remove the stabilizing salt gradient, but not the destabilizing temperature gradient over most of the depth of the layer. This arises from the fact that heat diffuses much more quickly than does salt. The Peelet numbers T = Wod/T and S = Wod/S where T and S are the molecular diffusivities of heat and salt respectively, d is the depth of the layer, Wo the imposed vertical velocity, are dimensionless measures of the relative importance of advection and diffusion. Both the linear stability theory and the laboratory experiments show a decrease in the critical value of the Rayleigh number for the onset of oscillatory convection when |S| > 0, over that when S = 0. The calculation is valid for |S| ≤ 1. The laboratory experiments were conducted for 0 ≤ |S| ≤ 3.2, where Rc was found to be reduced by as much as 20%.

Document Type: Research Article


Publication date: February 1, 1990

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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