Baroclinic flow around planetary islands in a double gyre : a mechanism for cross-gyre flow


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dc.contributor.author Pedlosky, Joseph
dc.date.accessioned 2010-10-20T14:30:57Z
dc.date.available 2010-11-01T08:21:58Z
dc.date.issued 2010-05
dc.identifier.citation Journal of Physical Oceanography 40 (2010): 1075-1086 en_US
dc.identifier.uri http://hdl.handle.net/1912/3963
dc.description Author Posting. © American Meteorological Society, 2010. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 40 (2010): 1075-1086, doi:10.1175/2009JPO4375.1. en_US
dc.description.abstract A quasigeostrophic, two-layer model is used to study the baroclinic circulation around a thin, meridionally elongated island. The flow is driven by either buoyancy forcing or wind stress, each of whose structure would produce an antisymmetric double-gyre flow. The ocean bottom is flat. When the island partially straddles the intergyre boundary, fluid from one gyre is forced to flow into the other. The amount of the intergyre flow depends on the island constant, that is, the value of the geostrophic streamfunction on the island in each layer. That constant is calculated in a manner similar to earlier studies and is determined by the average, along the meridional length of the island, of the interior Sverdrup solution just to the east of the island. Explicit solutions are given for both buoyancy and wind-driven flows. The presence of an island of nonzero width requires the determination of the baroclinic streamfunction on the basin’s eastern boundary. The value of the boundary term is proportional to the island’s area. This adds a generally small additional baroclinic intergyre flow. In all cases, the intergyre flow produced by the island is not related to topographic steering of the flow but rather the pressure anomaly on the island as manifested by the barotropic and baroclinic island constants. The vertical structure of the flow around the island is a function of the parameterization of the vertical mixing in the problem and, in particular, the degree to which long baroclinic Rossby waves can traverse the basin before becoming thermally damped. en_US
dc.description.sponsorship This research was supported in part by NSF Grant OCE 0451086. en_US
dc.format.mimetype application/pdf
dc.language.iso en_US en_US
dc.publisher American Meteorological Society en_US
dc.relation.uri http://dx.doi.org/10.1175/2009JPO4375.1
dc.subject Gyres en_US
dc.subject Baroclinic flows en_US
dc.subject Topographic effects en_US
dc.subject Streamfunction en_US
dc.subject Orographic effects en_US
dc.title Baroclinic flow around planetary islands in a double gyre : a mechanism for cross-gyre flow en_US
dc.type Article en_US
dc.identifier.doi 10.1175/2009JPO4375.1

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