The Flux of Dense Cold Overflow Water Southeast of Iceland

Saunders, Peter M.

doi:10.1175/1520-0485(1996)026<0085:tfodco>2.0.co;2

Cited by 53 publications

(86 citation statements)

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“…The net southward transport of ISOW for OVIDE 2014 is significantly higher than previous estimates of about −3 Sv (e.g. Saunders, 1996;van Aken and Becker, 1996;Lherminier et al, 2007;Sarafanov et al, 2012). However, it is in agreement with the −5.8 ± 0.9 Sv observed at the OSNAP array (58-59 • N) between July 2014 and July 2016 .…”

Section: Water Mass Volume Transports For 2014supporting

confidence: 82%

Water mass distributions and transports for the 2014 GEOVIDE cruise in the North Atlantic

et al. 2018

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Abstract. We present the distribution of water masses along the GEOTRACES-GA01 section during the GEO-VIDE cruise, which crossed the subpolar North Atlantic Ocean and the Labrador Sea in the summer of 2014. The water mass structure resulting from an extended optimum multiparameter (eOMP) analysis provides the framework for interpreting the observed distributions of trace elements and their isotopes. Central Waters and Subpolar Mode Waters (SPMW) dominated the upper part of the GEOTRACES-GA01 section. At intermediate depths, the dominant water mass was Labrador Sea Water, while the deep parts of the section were filled by Iceland-Scotland Overflow Water (ISOW) and North-East Atlantic Deep Water. We also evaluate the water mass volume transports across the 2014 OVIDE line (Portugal to Greenland section) by combining the water mass fractions resulting from the eOMP analysis with the absolute geostrophic velocity field estimated through a box inverse model. This allowed us to assess the relative contribution of each water mass to the transport across the section. Finally, we discuss the changes in the distribution and transport of water masses between the 2014 OVIDE line and the 2002-2010 mean state. At the upper and intermediate water levels, colder end-members of the water masses replaced the warmer ones in 2014 with respect to

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Section: Water Mass Volume Transports For 2014supporting

confidence: 82%

Water mass distributions and transports for the 2014 GEOVIDE cruise in the North Atlantic

et al. 2018

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“…The presence of LDW in the Iceland Basin, identified with high silicate content, and the interaction with ISOW there were also discussed by van Aken and de Boer [1995] and van Aken and Becker [1996]. Because of LDW influence, the silicate content of the ISOW through the CGFZ (13-17 mmol l −1 ) is significantly higher than that at the SEI array (9-10 mmol l −1 ) [see Saunders, 1996, Figure 2d]. …”

Section: A3 a Comment On An Ldw Contributionmentioning

confidence: 77%

“…It is also smaller than the 3.2 Sv observed at the upstream SEI section [Saunders, 1996]. The problem is augmented if flow through the CGFZ also contains a contribution from LDW.…”

Section: A2 Overflow Water In the Iceland Basinmentioning

confidence: 80%

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Transport of Nordic Seas overflow water into and within the Irminger Sea: An eddy‐resolving simulation and observations

Schmitz²,

Hurlburt

et al. 2010

J. Geophys. Res.

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[1] Results from a climatologically forced, eddy-resolving (1/12°) Atlantic simulation using the Hybrid Coordinate Ocean Model help clarify some presently unresolved connections between volume transports of Nordic Seas overflow water at key locations in the northernmost North Atlantic Ocean. The model results demonstrate that, in addition to the known westward flow through the Charlie Gibbs Fracture Zone (CGFZ), some Iceland Scotland overflow water (ISOW) flows westward through gaps in the Reykjanes Ridge north of the CGFZ into the Irminger Sea, and some flows southward along the eastern flank of the Mid-Atlantic Ridge into the West European Basin. These results provide insights into the well-known inconsistency between observed westward transport of ISOW through the CGFZ (2.4 Sv) and the transports upstream at Southeast of Iceland section (3.2 Sv) and downstream in the western Irminger Sea (4.5 Sv). Although the portion of the simulated ISOW that flows through CGFZ is about 500 m deeper than observed, the model results also show two ISOW pathways of this flow into the Irminger Sea, one northward along the western flank of the Reykjanes Ridge and the other westward before turning north-eastward on the western side of the Irminger Basin. Comparisons with the long-term moored instrument database in the Irminger Sea show that the model-based mean circulation is in reasonable agreement with observed volume transports of overflow water and that it gives approximately correct temperature and salinity characteristics.

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“…Assuming a realistic additional net flow because of the net transport through Bering Strait (0.8 Sv; Coachman and Aagaard, 1988) only had an effect on the barotropic terms Trnet and Trbte, but the latter effect was negligible compared to the other transport terms. Therefore we used the zero net flow constraint in a simple inverse model like the models used by Roemmich and Wunsch (1985) and Klein et al (1995), together with the constraints that in the Iceland Basin the southward flow below the u($ = 27.8 kg m-3 surface amounts to 3.5 Sv (Saunders, 1993;Dickson and Brown, 1994;Van Aken, 1995) and that in the Irminger Sea the southward transport below this density level amounts to 12 Sv (Dickson and Brown, 1994). This simple inverse model was used for a second calculation of the geostrophic velocity.…”

Section: Determination Of the Flow Fieldmentioning

confidence: 99%

Meridional carbon dioxide transport in the northern North Atlantic

et al. 1996

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Combination of estimated water transport and accurate measurements of total carbon dioxide (TCO,) on a hydrographic section at 58"N allows the assessment of meridional inorganic carbon transport in the northern North Atlantic Ocean. The transport has been decomposed into contributions from the large-scale baroclinic overturning, the Ekman transport, baroclinic and a barotropic eddy terms, and an estimated contribution of the East Greenland Current. North Atlantic, using our flux estimates as well as those of Brewer et al. (1989). This budget shows that the divergence of the meridional carbon flux, connected with the freshwater balance of the ocean may be of the same order of magnitude as the divergence of the total inorganic carbon flux. For an accurate estimate of the total carbon budget of the ocean it will be necessary to take both the DOC transport and the effects of the freshwater balance into account.

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The Flux of Dense Cold Overflow Water Southeast of Iceland

Cited by 53 publications

References 0 publications

Water mass distributions and transports for the 2014 GEOVIDE cruise in the North Atlantic

Water mass distributions and transports for the 2014 GEOVIDE cruise in the North Atlantic

Transport of Nordic Seas overflow water into and within the Irminger Sea: An eddy‐resolving simulation and observations

Meridional carbon dioxide transport in the northern North Atlantic

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