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The Role of Bottom Pressure Torques on the Interior Pathways of North Atlantic Deep Water

The Role of Bottom Pressure Torques on the Interior Pathways of North Atlantic Deep Water Four versions of the same global climate model, one with horizontal resolution of 1.8° × 3.6° and three with 0.2° × 0.4°, are employed to evaluate the role of ocean bottom topography and viscosity on the spatial structure of the deep circulation. This study is motivated by several recent observational studies that find that subsurface floats injected near the western boundary of the Labrador Sea most often do not continuously follow the deep western boundary current (DWBC), in contrast to the traditional view that the deep water formed in the North Atlantic predominantly follows the DWBC. It is found that, with imposed large viscosity values, the model reproduces the traditional view. However, as viscosity is reduced and the model bathymetry resolution increased, much of the North Atlantic Deep Water (NADW) separates from the western boundary and enters the low-latitude Atlantic via interior pathways distinct from the DWBC. It is shown that bottom pressure torques play an important role in maintaining these interior NADW outflows. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Physical Oceanography American Meteorological Society

The Role of Bottom Pressure Torques on the Interior Pathways of North Atlantic Deep Water

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Publisher
American Meteorological Society
Copyright
Copyright © 2010 American Meteorological Society
ISSN
0022-3670
eISSN
1520-0485
DOI
10.1175/2011JPO4584.1
Publisher site
See Article on Publisher Site

Abstract

Four versions of the same global climate model, one with horizontal resolution of 1.8° × 3.6° and three with 0.2° × 0.4°, are employed to evaluate the role of ocean bottom topography and viscosity on the spatial structure of the deep circulation. This study is motivated by several recent observational studies that find that subsurface floats injected near the western boundary of the Labrador Sea most often do not continuously follow the deep western boundary current (DWBC), in contrast to the traditional view that the deep water formed in the North Atlantic predominantly follows the DWBC. It is found that, with imposed large viscosity values, the model reproduces the traditional view. However, as viscosity is reduced and the model bathymetry resolution increased, much of the North Atlantic Deep Water (NADW) separates from the western boundary and enters the low-latitude Atlantic via interior pathways distinct from the DWBC. It is shown that bottom pressure torques play an important role in maintaining these interior NADW outflows.

Journal

Journal of Physical Oceanography – American Meteorological Society

Published: Sep 16, 2010

References

  • Correlations between climate records from North Atlantic sediments and Greenland ice
    Bond
  • Lagrangian observations of the deep western boundary current in the North Atlantic Ocean. Part I: Large-scale pathways and spreading rates
    Bower
  • Lagrangian observations of the deep western boundary current in the North Atlantic Ocean. Part II: The Gulf Stream–deep western boundary current crossover
    Bower
  • Interior pathways of the North Atlantic meridional overturning circulation
    Bower
  • Modelling the North Atlantic circulation: From eddy-resolving to eddy-permitting
    Bryan
  • Poleward heat transport in the ocean
    Bryan
  • A global ocean-atmosphere climate model. Part II. The oceanic circulation
    Bryan
  • Estimates of the mean circulation in the deep (>2,000 m) layer of the eastern North Atlantic
    Dickson
  • Global high-resolution mapping of ocean circulation from TOPEX/Poseidon and ERS-1 and -2
    Ducet
  • Implicit free-surface method for the Bryan-Cox-Semtner ocean model
    Dukowicz
  • A horizontal resolution and parameter sensitivity study of heat transport in an idealized coupled climate model
    Fanning
  • Labrador Sea Water tracked by profiling floats—From the boundary current into the open North Atlantic
    Fischer
  • The North Atlantic Oscillation, surface current velocities and SST changes in the subpolar North Atlantic
    Flatau
  • An eddy-resolving model of the Southern Ocean
    FRAM Group
  • Improved estimates of global ocean circulation, heat transport and mixing from hydrographic data
    Ganachaud
  • Large-scale ocean heat and freshwater transports during the World Ocean Circulation Experiment
    Ganachaud
  • Isopycnal mixing in ocean circulation models
    Gent
  • Lagrangian perspectives of deep water export from the subpolar North Atlantic
    Getzlaff
  • Direct estimates and mechanisms of ocean heat transport
    Hall
  • On the origin of mesoscale eddies and their contribution to the general circulation of the ocean. I. A preliminary numerical experiment
    Holland
  • A theoretical reason to expect inviscid western boundary currents in realistic oceans
    Hughes
  • Why western boundary currents in realistic oceans are inviscid: A link between form stress and bottom pressure torques
    Hughes
  • The oceanic eddy heat transport
    Jayne
  • Ocean viscosity and climate
    Jochum
  • Gulf Stream structure, transport, and recirculation near 68°W
    Johns
  • The NCEP–NCAR 50-Year Reanalysis: Monthly means CD-ROM and documentation
    Kistler
  • Mid-depth recirculation observed in the interior Labrador and Irminger seas by direct velocity measurements
    Lavender
  • Evidence for enhanced mixing over rough topography in the abyssal ocean
    Ledwell
  • Temperature
    Levitus
  • Salinity
    Levitus
  • Evidence for large-scale eddy-driven gyres in the North Atlantic
    Lozier
  • Deconstructing the conveyor belt
    Lozier
  • Large-scale vertical and horizontal circulation in the North Atlantic Ocean
    Lumpkin
  • Model evaluation
    McAvaney
  • The deep western boundary current in the tropical North Atlantic
    Molinari
  • On the wind-driven ocean circulation
    Munk
  • Potential vorticity and eddy potential enstrophy in the North Atlantic Ocean simulated by a global eddy-resolving model
    Nakamura