The Kuroshio Extension northern recirculation gyre : profiling float measurements and forcing mechanism


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dc.contributor.author Qiu, Bo
dc.contributor.author Chen, Shuiming
dc.contributor.author Hacker, Peter
dc.contributor.author Hogg, Nelson G.
dc.contributor.author Jayne, Steven R.
dc.contributor.author Sasaki, Hideharu
dc.date.accessioned 2010-11-04T15:57:21Z
dc.date.available 2010-11-04T15:57:21Z
dc.date.issued 2008-08
dc.identifier.citation Journal of Physical Oceanography 38 (2008): 1764-1779 en_US
dc.identifier.uri http://hdl.handle.net/1912/4063
dc.description Author Posting. © American Meteorological Society, 2008. 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 38 (2008): 1764-1779, doi:10.1175/2008JPO3921.1. en_US
dc.description.abstract Middepth, time-mean circulation in the western North Pacific Ocean (28°–45°N, 140°–165°E) is investigated using drift information from the profiling floats deployed in the Kuroshio Extension System Study (KESS) and the International Argo programs. A well-defined, cyclonic recirculation gyre (RG) is found to exist north of the Kuroshio Extension jet, confined zonally between the Japan Trench (145°E) and the Shatsky Rise (156°E), and bordered to the north by the subarctic boundary along 40°N. This northern RG, which is simulated favorably in the eddy-resolving OGCM for the Earth Simulator (OFES) hindcast run model, has a maximum volume transport at 26.4 Sv across 159°E and its presence persists on the interannual and longer time scales. An examination of the time-mean x-momentum balance from the OFES hindcast run output reveals that horizontal convergence of Reynolds stresses works to accelerate both the eastward-flowing Kuroshio Extension jet and a westward mean flow north of the meandering jet. The fact that the northern RG is eddy driven is further confirmed by examining the turbulent Sverdrup balance, in which convergent eddy potential vorticity fluxes are found to induce the cyclonic RG across the background potential vorticity gradient field. For the strength of the simulated northern RG, the authors find the eddy dissipation effect to be important as well. en_US
dc.description.sponsorship This study was supported by NSF through Grant OCE-0220680 (UH) and OCE-0220161 (WHOI). 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/10.1175/2008JPO3921.1
dc.subject Gyres en_US
dc.subject Ocean circulation en_US
dc.subject Profilers en_US
dc.subject Jets en_US
dc.subject Transport en_US
dc.title The Kuroshio Extension northern recirculation gyre : profiling float measurements and forcing mechanism en_US
dc.type Article en_US
dc.identifier.doi 10.1175/2008JPO3921.1

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