Circulation and overturning in the eastern North Atlantic subpolar gyre

Koman, Greg; Johns, William E.; Houk, Adam; Houpert, Loïc; Li, F.

doi:10.1016/j.pocean.2022.102884

Cited by 9 publications

(6 citation statements)

References 67 publications

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“…In the Nordic Seas, there are significant horizontal gradients in water density and the transformation (overturning) of less-dense waters to more-dense waters is best quantified by the meridional overturning stream function in density space [10][11][12] (Methods). Recent resultsfrom both observations and modelshave demonstrated that the cyclonic horizontal circulation that flows across sloping isopycnals dominates the density-space overturning in the subpolar North Atlantic and Nordic Seas [12][13][14][15] . These results thus challenge the importance of open-ocean deep convection in setting the strength of the AMOC.…”

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confidence: 99%

Future strengthening of the Nordic Seas overturning circulation

et al. 2023

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The overturning circulation in the Nordic Seas involves the transformation of warm Atlantic waters into cold, dense overflows. These overflow waters return to the North Atlantic and form the headwaters to the deep limb of the Atlantic meridional overturning circulation (AMOC). The Nordic Seas are thus a key component of the AMOC. However, little is known about the response of the overturning circulation in the Nordic Seas to future climate change. Here we show using global climate models that, in contrast to the North Atlantic, the simulated density-space overturning circulation in the Nordic Seas increases throughout most of the 21st century as a result of enhanced horizontal circulation and a strengthened zonal density gradient. The increased Nordic Seas overturning is furthermore manifested in the overturning circulation in the eastern subpolar North Atlantic. A strengthened Nordic Seas overturning circulation could therefore be a stabilizing factor in the future AMOC.

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confidence: 99%

Future strengthening of the Nordic Seas overturning circulation

et al. 2023

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“…The zonal mooring line crossing the subarctic Atlantic, as the first AMOC observation in this region, has observed significantly stronger AMOC east of Greenland relative to the Labrador Sea since 2014 [6], further confirmed by a 60 year reconstruction [7]. The amounts of overturning in the Nordic, Iceland, Irminger Sea account for 39%, 48% and 13% of the total overturning in the eastern subarctic Atlantic, respectively [8]. This phenomena implies that deep convection in the eastern subarctic Atlantic is more dominant at modulating the AMOC, different than the former cognition of dominance in the Labrador Sea.…”

Section: Deep-convection Sites Might Appear In the Arctic Oceanmentioning

confidence: 58%

A plausible emergence of new convection sites in the Arctic Ocean in a warming climate

Gou,

Wang,

Xiao

et al. 2024

Environ. Res. Lett.

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“…When looking at it more precisely, opinions diverge a lot, due to the lack of available data in the area. Investigators sometimes only consider the IFR, the FBC, include an overflow over the Western Valley, or assume a pathway across the deep waters of the Iceland Basin, see for example, Bowles and Jahn (1983); Hansen (1985); Perkins et al (1998); Hansen andØsterhus (2000, 2007); Beaird et al (2013); Logemann et al (2013); Guo et al (2014); Ullgren et al (2014); Daniault et al (2016); Zou et al (2017); Zhao et al (2018); Hansen et al (2018); Petit et al (2019); Chafik and Rossby (2019); Koman et al (2022); . Understanding the actual properties of local geophysical processes at depth is therefore timely.…”

Section: Introductionmentioning

confidence: 99%

Structure of the Bottom Boundary Current South of Iceland and Spreading of Deep Waters by Submesoscale Processes

de Marez,

Ruiz‐Angulo,

Le Corre

2024

Geophysical Research Letters

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The northeastern part of the North Atlantic subpolar gyre is a key passage for the Atlantic Meridional Overturning Circulation upper cell. To this day, the precise pathway and intensity of bottom currents in this area is not clear. In this study, we make use of regional high resolution numerical modeling to suggest that the main bottom current flowing south of Iceland originates from both the Faroe‐Banks Channel and the Iceland‐Faroe Ridge and then flows along the topographic slope. When flowing over the rough topography, this bottom current generates a 200 m large bottom mixed layer. We further demonstrate that many submesoscale structures are generated at the southernmost tip of the Icelandic shelf, which subsequently spread water masses in the Iceland Basin. These findings have major implication for the understanding of the water masses transport in the North Atlantic, and also for the distribution of benthic species along the Icelandic shelf.

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Circulation and overturning in the eastern North Atlantic subpolar gyre

Cited by 9 publications

References 67 publications

Future strengthening of the Nordic Seas overturning circulation

Future strengthening of the Nordic Seas overturning circulation

A plausible emergence of new convection sites in the Arctic Ocean in a warming climate

Structure of the Bottom Boundary Current South of Iceland and Spreading of Deep Waters by Submesoscale Processes

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