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dc.contributor.authorMarchal, Olivier  Concept link
dc.contributor.authorWhitehead, John A.  Concept link
dc.contributor.authorJensen, Anders  Concept link
dc.date.accessioned2012-04-23T18:18:38Z
dc.date.available2012-04-23T18:18:38Z
dc.date.issued2011-07-01
dc.identifier.citationJournal of Marine Research 69 (2011): 603-645en_US
dc.identifier.urihttps://hdl.handle.net/1912/5142
dc.descriptionAuthor Posting. © Sears Foundation for Marine Research, 2011. This article is posted here by permission of Sears Foundation for Marine Research for personal use, not for redistribution. The definitive version was published in Journal of Marine Research 69 (2011): 603-645, doi:10.1357/002224011799849417.en_US
dc.description.abstractFreshwater is released along a wall of a basin containing salt water and rotating anticlockwise. The freshwater source is located near the surface between the center of the cylindrical basin and a corner along the wall. Experiments are performed with different discharge rates and the same rotation rate. The freshwater initially forms a bulge near the source, and then a buoyant gravity current bends to the right and flows along the wall toward the periphery of the basin. Separation of the current at the corner is never observed. The salinity front along the wall moves persistently away from the wall with a time scale greatly exceeding the rotation period. Its movement is compared to numerical solutions of a two-layer theory, where friction in the Ekman layer straddling the layer interface is the sole ageostrophic effect. The theory shows that the depth of the interface (h) satisfies a nonlinear diffusion equation. The symmetric part of the diffusion tensor causes light fluid to move down the gradient of h and represents the effect of vertical friction. The associated diffusivity reaches a maximum at h/δ = π/2, where δ is the Ekman layer depth. The antisymmetric part of the diffusion tensor causes light fluid to move perpendicularly to ∇h and represents the effect of geostrophic motion. The associated diffusivity increases monotonically with h/δ and greatly exceeds the diffusivity of the symmetric part if h/δ is of order of one or more. Comparison of numerical solutions with experimental data supports the theory.en_US
dc.description.sponsorshipThis study was supported by the Ocean and Climate Change Institute at WHOI.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherSears Foundation for Marine Researchen_US
dc.relation.urihttps://doi.org/10.1357/002224011799849417
dc.titlePenetration of a salinity front into a rotating basin : laboratory experiments and a simple theoryen_US
dc.typeArticleen_US
dc.identifier.doi10.1357/002224011799849417


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