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- Title
Shear and Convective Turbulence in a Model of Thermohaline Intrusions.
- Authors
Mueller, Rachael D.; Smyth, William D.; Ruddick, Barry
- Abstract
Thermohaline interleaving is an important mechanism for laterally fluxing salt, heat, and nutrients between water masses. Interleaving is driven by a release of potential energy resulting from the differing diffusivities of heat and salt in seawater. The flows are composed of stacked intrusions that flux more and less buoyant water in opposite directions. In this paper, the role of shear instability caused by this juxtaposed motion is investigated. The model described in Walsh and Ruddick is modified to include both the effects of shear-induced turbulence and an improved convective mixing parameterization. Shear and convective mixing play a similar and significant role in interleaving dynamics. In the absence of either instability, cross-front fluxes are increased by approximately 30%. While in situ observations of horizontal diffusivity resulting from interleaving are not yet precise enough to calibrate the parameterizations independently, parameter values based on independent laboratory and numerical studies lead to diffusivity predictions that are within the error of the observations.
- Subjects
OCEAN circulation; MERIDIONAL overturning circulation; WATER masses; DIFFUSION; SEAWATER thermodynamics; HYDROTHERMAL circulation (Oceanography); THERMAL diffusivity; TURBULENCE; SHEAR flow
- Publication
Journal of Physical Oceanography, 2007, Vol 37, Issue 10, p2534
- ISSN
0022-3670
- Publication type
Article
- DOI
10.1175/JPO3137.1