Physical and biogeochemical fluxes and net budgets in the subpolar and temperate North Atlantic
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ID: 299671
2002
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Abstract
A transoceanichydrographicsection across the North Atlantic Subpolar gyre from Vigo (northwestern Iberian Peninsula) to Cape Farewell (south of Greenland) was sampled in summer 1997 as part of the World Ocean Circulation Experiment program (WOCE A25, 4x cruise).The circulation pattern across the 4x section is diagnosed using inverse methods.The ow is constrained with measured mass transports at speci c sites, while conservingmass and salt for the region north of the section and forcing the silicate ux to a reasonable value.The uxes of physical (heat and freshwater) and chemical (nutrients and oxygen) properties are estimated and decomposed into barotropic, baroclinic and horizontal components.The heat transport amounts to 0.65 6 0.1 PW poleward, with 54% and 45% of the ux due to the baroclinic (or overturning) and horizontal circulation, respectively.From the salt conservation, an equatorward freshwater transport of 20.4 6 1.5 Sv is estimated, resulting from net precipitation plus runoff over the North Atlantic Ocean north of the section.The Subpolar gyre exports nutrients and oxygen southward toward the Subtropical ocean at rates of 250 6 19, 26 6 2, 226 6 15 and 21992 6 440 kmol s 2 1 for nitrate, phosphate, silicate and oxygen, respectively.The main mechanism responsible for the nutrient transport is the overturning cell, whereas oxygen is mainly transported southward due to the large-scale horizontal circulation.Combining our uxes with those from the 36N section (Rintoul and Wunsch, 1991) allows us to examine budgets of physical (heat and freshwater) and chemical (nitrogen and oxygen) properties for an enclosed area of the Subpolar and Temperate North Atlantic.The tentative nitrogen budget for the box between the 4x and the 36N sections suggests that the Temperate North Atlantic is exporting
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| Authors | Marta Álvarez, Harry L. Bryden, Fı́z F. Pérez, Aida F. Rı́os, Gabriel Rosón |
| Journal | journal of marine research |
| Year | 2002 |
| DOI |
10.1357/00222400260497462
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| URL | |
| Keywords | Keywords not found |
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