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Circulation and transport in the western boundary currents at Cape Farewell, Greenland

By N.P. Holliday, S. Bacon, J.T. Allen and E.L. McDonagh

Abstract

The circulation and volume transports in the western boundary currents around Cape Farewell, Greenland, are derived from full-depth hydrographic and velocity measurements from August-September, 2005. The western boundary currents from surface to seafloor transport 40.5 ± 8.1 Sv southwards in the Irminger Sea, and 53.8 ± 10.8 Sv northwards in the Labrador Sea. The Deep Western Boundary Current (DWBC, defined as water with potential density greater than 27.80 kg m-3) transports 12.3 ± 2.5 Sv southwards in the Irminger Sea. The deep water transport is reduced south of Cape Farewell, where it changes flow direction from southwards to northwards (the south corner). At a section over the Eirik Ridge, a bathymetric feature extending southwest of Cape Farewell, the DWBC transports 8.7 ± 1.7 Sv westwards. The reduction in transport at the south corner is associated with decreased velocities within the deepest layers, and the volumetric loss of the most saline deep water types. The observations suggest that the part of the shallow and deep western boundary currents diverge at the south corner. Downstream in the eastern Labrador Sea the deep water transport is increased to 19.7 ± 3.9 Sv northwards, with the addition of recirculating denser deep waters. The representativeness of the results from the semi-synoptic survey are discussed with reference to companion current meter measurements of the DWBC

Topics: GC
Year: 2009
OAI identifier: oai:eprints.soton.ac.uk:65724
Provided by: e-Prints Soton

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  1. (2007). 2007a: Spreading of the Labrador Sea Water to the Irminger and Iceland basins.
  2. (2002). A freshwater jet on the east Greenland shelf.
  3. (2008). Accessing the Inaccessible: buoyancy-driven coastal currents on the shelves of Greenland and eastern Canada.
  4. (2004). Boundary circulation at the exit of the Labrador Sea.
  5. (2004). Boundary current eddies and their role in the restratification of the Labrador Sea.
  6. (2004). Circulation and deep water export at the western exit of the subpolar North Atlantic.
  7. (1997). Circulation and fluxes in the North Atlantic between Greenland and Ireland.
  8. (1985). Contourites from Eirik Ridge, south of Greenland.
  9. (2004). Decline of subpolar North Atlantic circulation during the 1990s.
  10. (2002). Deep velocity profiling using Lowered Acoustic Doppler Current Profilers: bottom track and inverse solutions.
  11. (2004). Deep water changes at the western boundary of the subpolar North Atlantic during
  12. (2007). Deep western boundary current dynamics and associated sedimentation on the Eirik Drift, Southern Greenland Margin.
  13. (2002). Efficient inverse modelling of barotropic ocean tides.
  14. (1998). Evidence for decadal variability in the outflow from the Nordic Seas to the deep Atlantic Ocean.
  15. (1995). Gulf Stream-generated topographic Rossby Waves.
  16. (1999). Holocene periodicity in North Atlantic 28 climate and deep ocean flow south of Iceland.
  17. (2007). Impact of Labrador Sea convection on the North Atlantic meridional overturning circulation.
  18. (2008). Intensified turbulent mixing in the boundary current system of southern 30 Greenland.
  19. (2002). Labrador Sea Boundary Currents and the Fate of Irminger Sea Water.
  20. (1995). On the circulation of the northeastern North Atlantic,
  21. (1995). On the synoptic hydrography of intermediate and deep water masses in the Iceland Basin.
  22. (1992). Recirculating components to the deep boundary current of the northern North Atlantic.
  23. (1995). Summer mean circulation of the northwestern Atlantic Ocean.
  24. (2008). The Deep Western Boundary Current at Cape Farewell: Results from a moored current meter array. submitted to Journal of Physical Oceanography.
  25. (2001). The dense northern overflows. Ocean circulation and climate; observing and modelling the global
  26. (2008). The East Greenland Coastal Current: Structure, variability and forcing.
  27. (2005). The East Greenland Spill Jet.
  28. (1983). The formation of Labrador Sea Water 1. Large-scale processes.
  29. (2005). The mid-depth circulation of the subpolar North Atlantic Ocean as measured by subsurface floats.
  30. (1994). The production of North Atlantic Deep Water: sources, rates and pathways.
  31. (2007). The retroflection of part of the East Greenland Current at Cape Farewell.
  32. (1984). Transport through the Cape Farewell - Flemish Cap section.
  33. (2007). Transports across the 2002 Greenland-Portugal Ovide section and comparison with
  34. (2006). Variability of the overflow water transport in the western subpolar North Atlantic,

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