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Reconciling tracer and float observations of the export pathways of Labrador Sea Water

Publication ,  Journal Article
Gary, SF; Lozier, MS; Biastoch, A; Bning, CW
Published in: Geophysical Research Letters
December 28, 2012

For more than fifty years, it has been generally accepted by oceanographers that the Deep Western Boundary Current (DWBC) is the principal conduit of recently-convected Labrador Sea Water (LSW) exported from the high-latitude North Atlantic to the equator. Supporting this supposition is observational evidence that the waters of the DWBC have consistently greater equatorward velocities, higher concentrations of passive tracers, and younger ages compared to ocean interior waters. However, recent observations and simulations of floats launched in the DWBC in the Labrador Sea show that most water parcels are quickly ejected from the DWBC and follow instead interior pathways to the subtropics. Here, we show that tracer observations from the last three decades are compatible with the existence of both DWBC and basin-interior export pathways. From analyses of observational data and model output, we find that equatorward transport in the basin interior is consistent with the large-scale vorticity balance at mid-depth. Furthermore, from the modeling analysis we show that despite higher, localized concentrations of tracer and particles in the DWBC, only 5% of particles released in the Labrador Sea are transported from the subpolar to subtropical gyre via a continuous DWBC pathway. Thus, the interior pathway is a significant contributor to LSW export. © 2012. American Geophysical Union. All Rights Reserved.

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Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

December 28, 2012

Volume

39

Issue

24

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

Citation

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Gary, S. F., Lozier, M. S., Biastoch, A., & Bning, C. W. (2012). Reconciling tracer and float observations of the export pathways of Labrador Sea Water. Geophysical Research Letters, 39(24). https://doi.org/10.1029/2012GL053978
Gary, S. F., M. S. Lozier, A. Biastoch, and C. W. Bning. “Reconciling tracer and float observations of the export pathways of Labrador Sea Water.” Geophysical Research Letters 39, no. 24 (December 28, 2012). https://doi.org/10.1029/2012GL053978.
Gary SF, Lozier MS, Biastoch A, Bning CW. Reconciling tracer and float observations of the export pathways of Labrador Sea Water. Geophysical Research Letters. 2012 Dec 28;39(24).
Gary, S. F., et al. “Reconciling tracer and float observations of the export pathways of Labrador Sea Water.” Geophysical Research Letters, vol. 39, no. 24, Dec. 2012. Scopus, doi:10.1029/2012GL053978.
Gary SF, Lozier MS, Biastoch A, Bning CW. Reconciling tracer and float observations of the export pathways of Labrador Sea Water. Geophysical Research Letters. 2012 Dec 28;39(24).
Journal cover image

Published In

Geophysical Research Letters

DOI

EISSN

1944-8007

ISSN

0094-8276

Publication Date

December 28, 2012

Volume

39

Issue

24

Related Subject Headings

  • Meteorology & Atmospheric Sciences