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dc.contributor.authorYang, Jiayan  Concept link
dc.contributor.authorPratt, Lawrence J.  Concept link
dc.date.accessioned2015-01-08T17:07:16Z
dc.date.available2015-06-01T09:08:35Z
dc.date.issued2014-12
dc.identifier.citationJournal of Physical Oceanography 44 (2014): 3033–3053en_US
dc.identifier.urihttps://hdl.handle.net/1912/7033
dc.descriptionAuthor Posting. © American Meteorological Society, 2014. 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 44 (2014): 3033–3053, doi:10.1175/JPO-D-13-0227.1.en_US
dc.description.abstractThe East Greenland Current (EGC) had long been considered the main pathway for the Denmark Strait overflow (DSO). Recent observations, however, indicate that the north Icelandic jet (NIJ), which flows westward along the north coast of Iceland, is a major separate pathway for the DSO. In this study a two-layer numerical model and complementary integral constraints are used to examine various pathways that lead to the DSO and to explore plausible mechanisms for the NIJ’s existence. In these simulations, a westward and NIJ-like current emerges as a robust feature and a main pathway for the Denmark Strait overflow. Its existence can be explained through circulation integrals around advantageous contours. One such constraint spells out the consequences of overflow water as a source of low potential vorticity. A stronger constraint can be added when the outflow occurs through two outlets: it takes the form of a circulation integral around the Iceland–Faroe Ridge. In either case, the direction of overall circulation about the contour can be deduced from the required frictional torques. Some effects of wind stress forcing are also examined. The overall positive curl of the wind forces cyclonic gyres in both layers, enhancing the East Greenland Current. The wind stress forcing weakens but does not eliminate the NIJ. It also modifies the sign of the deep circulation in various subbasins and alters the path by which overflow water is brought to the Faroe Bank Channel, all in ways that bring the idealized model more in line with observations. The sequence of numerical experiments separates the effects of wind and buoyancy forcing and shows how each is important.en_US
dc.description.sponsorshipThis study has been supported by National Science Foundation (OCE0927017 and ARC1107412).en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAmerican Meteorological Societyen_US
dc.relation.urihttps://doi.org/10.1175/JPO-D-13-0227.1
dc.subjectCirculation/ Dynamicsen_US
dc.subjectBoundary currentsen_US
dc.subjectChannel flowsen_US
dc.subjectMeridional overturning circulationen_US
dc.subjectOcean circulationen_US
dc.subjectTopographic effectsen_US
dc.titleSome dynamical constraints on upstream pathways of the Denmark Strait Overflowen_US
dc.typeArticleen_US
dc.description.embargo2015-06-01en_US
dc.identifier.doi10.1175/JPO-D-13-0227.1


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