Impact of a 30% reduction in Atlantic meridional overturning during 2009–2010

Bryden, Harry L.; King, Brian; McCarthy, Gerard; McDonagh, Elaine L.

doi:10.5194/os-10-683-2014

Cited by 69 publications

(51 citation statements)

References 21 publications

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“…This drove an adiabatic shoaling of isotherms through decreased Ekman pumping, presumably leading to transport anomalies across 268 and 458N. This suggests that the reduction in the northward transport observed at Bryden et al 2014) reflects a southward shift in the mean structure of the interior gyre circulation. While the shift of the gyre (as delimited by the 108C isotherm) is primarily driven adiabatically, the gyre heat content anomaly is also affected by air-sea heat fluxes.…”

Section: Discussionmentioning

confidence: 94%

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Recent Wind-Driven Variability in Atlantic Water Mass Distribution and Meridional Overturning Circulation

Evans

Toole

Forget

et al. 2017

Journal of Physical Oceanography

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Interannual variability in the volumetric water mass distribution within the North Atlantic Subtropical Gyre is described in relation to variability in the Atlantic meridional overturning circulation. The relative roles of diabatic and adiabatic processes in the volume and heat budgets of the subtropical gyre are investigated by projecting data into temperature coordinates as volumes of water using an Argo-based climatology and an ocean state estimate (ECCO version 4). This highlights that variations in the subtropical gyre volume budget are predominantly set by transport divergence in the gyre. A strong correlation between the volume anomaly due to transport divergence and the variability of both thermocline depth and Ekman pumping over the gyre suggests that wind-driven heave drives transport anomalies at the gyre boundaries. This wind-driven heaving contributes significantly to variations in the heat content of the gyre, as do anomalies in the air-sea fluxes. The analysis presented suggests that wind forcing plays an important role in driving interannual variability in the Atlantic meridional overturning circulation and that this variability can be unraveled from spatially distributed hydrographic observations using the framework presented here.

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Section: Discussionmentioning

confidence: 94%

“…This interannual variability can be very pronounced. It remains unclear whether this change occurred because of local atmospheric forcing anomalies (Roberts et al 2013;Buckley et al 2014;Yang 2015) or through remotely forced changes in the overturning (Cunningham et al 2013;Sonnewald et al 2013;Bryden et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Recent Wind-Driven Variability in Atlantic Water Mass Distribution and Meridional Overturning Circulation

Evans

Toole

Forget

et al. 2017

Journal of Physical Oceanography

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“…The basinscale Gyre circulation comprises an intense western boundary current (Gulf Stream) with a set of narrower and weaker recirculation cells (bifurcations) populated by eddies, filaments and other turbulent features (see also Bryden et al, 2014;Elken, 2016). The Azores is affected by these filaments and eddies that converge at the archipelago.…”

Section: Resultsmentioning

confidence: 99%

The Azores Confluence Zone

Caldeira

Reis

2017

Front. Mar. Sci.

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“…However, as suggested by one reviewer, this does not preclude a more indirect link to the overturning circulation. For instance, Bryden et al (2014) argue that the sharp reduction in the overturning circulation (and associated meridional heat transport) during 2009/10 leads to an anomalous atmospheric state over the North Atlantic sector, whose influence was subsequently felt at the coast (cf. Goddard et al 2015).…”

Section: Discussionmentioning

confidence: 99%

Annual Sea Level Changes on the North American Northeast Coast: Influence of Local Winds and Barotropic Motions

et al. 2016

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Understanding the relationship between coastal sea level and the variable ocean circulation is crucial for interpreting tide gauge records and projecting sea level rise. In this study, annual sea level records (adjusted for the inverted barometer effect) from tide gauges along the North American northeast coast over 1980-2010 are compared to a set of data-assimilating ocean reanalysis products as well as a global barotropic model solution forced with wind stress and barometric pressure. Correspondence between models and data depends strongly on model and location. At sites north of Cape Hatteras, the barotropic model shows as much (if not more) skill than ocean reanalyses, explaining about 50% of the variance in the adjusted annual tide gauge sea level records. Additional numerical experiments show that annual sea level changes along this coast from the barotropic model are driven by local wind stress over the continental shelf and slope. This result is interpreted in the light of a simple dynamic framework, wherein bottom friction balances surface wind stress in the alongshore direction and geostrophy holds in the across-shore direction. Results highlight the importance of barotropic dynamics on coastal sea level changes on interannual and decadal time scales; they also have implications for diagnosing the uncertainties in current ocean reanalyses, using tide gauge records to infer past changes in ocean circulation, and identifying the physical mechanisms responsible for projected future regional sea level rise.

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Impact of a 30% reduction in Atlantic meridional overturning during 2009–2010

Cited by 69 publications

References 21 publications

Recent Wind-Driven Variability in Atlantic Water Mass Distribution and Meridional Overturning Circulation

Recent Wind-Driven Variability in Atlantic Water Mass Distribution and Meridional Overturning Circulation

The Azores Confluence Zone

Annual Sea Level Changes on the North American Northeast Coast: Influence of Local Winds and Barotropic Motions

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