Mean full-depth summer circulation and transports at the northern periphery of the Atlantic Ocean in the 2000s

Type Publication
Date 2012-01
Language English
Copyright 2012 by the American Geophysical Union
Author(s) Sarafanov Artem1, 2, Falina Anastasia1, 2, Mercier HerleORCID3, Sokov Alexey1, Lherminier PascaleORCID4, Gourcuff Claire3, Gladyshev Sergey1, Gaillard FabienneORCID4, Daniault Nathalie5
Affiliation(s) 1 : PP Shirshov Oceanol Inst, Moscow 117997, Russia.
2 : IRD, UBO, CNRS, Lab Phys Oceans, UMR 6523, IFREMER, F-29280 Plouzane, France.
3 : CNRS, Ifremer IRD, Lab Phys Oceans, UMR 6523, UBO, F-29238 Brest, France.
4 : Ifremer, IRD, CNRS,Lab Phys Oceans, UMR 6523, UBO, F-29280 Brest, France.
5 : UBO, CNRS, IRD, Lab Phys Oceans, UMR 6523, IFREMER, F-29280 Plouzane, France.
Source Journal Of Geophysical Research-oceans (0148-0227) (Amer Geophysical Union), 2012-01 , Vol. 117 , P. -
DOI 10.1029/2011JC007572
WOS© Times Cited 29
Abstract A mean state of the full-depth summer circulation in the Atlantic Ocean in the region in between Cape Farewell (Greenland), Scotland and the Greenland-Scotland Ridge (GSR) is assessed by combining 2002–2008 yearly hydrographic measurements at 59.5°N, mean dynamic topography, satellite altimetry data and available estimates of the Atlantic–Nordic Seas exchange. The mean absolute transports by the upper-ocean, mid-depth and deep currents and the Meridional Overturning Circulation (MOCσ = 16.5 ± 2.2 Sv, at σ0 = 27.55) at 59.5°N are quantified in the density space. Inter-basin and diapycnal volume fluxes in between the 59.5°N section and the GSR are then estimated from a box model. The dominant components of the meridional exchange across 59.5°N are the North Atlantic Current (NAC, 15.5 ± 0.8 Sv, σ0 < 27.55) east of the Reykjanes Ridge, the northward Irminger Current (IC, 12.0 ± 3.0 Sv) and southward Western Boundary Current (WBC, 32.1 ± 5.9 Sv) in the Irminger Sea and the deep water export from the northern Iceland Basin (3.7 ± 0.8 Sv, σ0 > 27.80). About 60% (12.7 ± 1.4 Sv) of waters carried in the MOCσ upper limb (σ0 < 27.55) by the NAC/IC across 59.5°N (21.1 ± 1.0 Sv) recirculates westward south of the GSR and feeds the WBC. 80% (10.2 ± 1.7 Sv) of the recirculating NAC/IC-derived upper-ocean waters gains density of σ0 > 27.55 and contributes to the MOCσ lower limb. Accordingly, the contribution of light-to-dense water conversion south of the GSR (∼10 Sv) to the MOCσ lower limb at 59.5°N is one and a half times larger than the contribution of dense water production in the Nordic Seas (∼6 Sv).
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Sarafanov Artem, Falina Anastasia, Mercier Herle, Sokov Alexey, Lherminier Pascale, Gourcuff Claire, Gladyshev Sergey, Gaillard Fabienne, Daniault Nathalie (2012). Mean full-depth summer circulation and transports at the northern periphery of the Atlantic Ocean in the 2000s. Journal Of Geophysical Research-oceans, 117, -. Publisher's official version : http://doi.org/10.1029/2011JC007572 , Open Access version : http://archimer.ifremer.fr/doc/00059/16997/