The Deep Western Boundary Current in the Labrador Sea From Observations and a High-Resolution Model.

Handmann, Patricia, Fischer, Jürgen , Visbeck, Martin , Karstensen, Johannes , Biastoch, Arne , Böning, Claus W. and Patara, Lavinia (2018) The Deep Western Boundary Current in the Labrador Sea From Observations and a High-Resolution Model. Open Access Journal of Geophysical Research: Oceans, 123 (4). pp. 2829-2850. DOI 10.1002/2017JC013702.

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Abstract

Long‐term observations from a 17 year long mooring array at the exit of the Labrador Sea at 53°N are compared to the output of a high‐resolution model (VIKING20). Both are analyzed to define robust integral properties on basin and regional scale, which can be determined and evaluated equally well. While both, the observations and the model, show a narrow DWBC cyclonically engulfing the Labrador Sea, the model's boundary current system is more barotropic than in the observations and spectral analysis indicates stronger monthly to interannual transport variability. Compared to the model, the observations show a stronger density gradient, hence a stronger baroclinicity, from center to boundary. Despite this, the observed temporal evolution of the temperature in the central Labrador Sea is reproduced. The model results yield a mean export of North Atlantic Deep Water (NADW) (33.0 +/‐ 5.7 Sv), which is comparable to the observed transport (31.2 +/‐ 5.5 Sv) at 53°N. The results also include a comparable spatial pattern and March mixed layer depth in the central Labrador Sea (maximum depth ∼ 2000 m). During periods containing enhanced deep convection (1990's) our analyses show increased correlation between LSW and LNADW model transport at 53°N. Our results indicate that the transport variability in LSW and LNADW at 53°N is a result of a complex modulation of wind stress and buoyancy forcing on regional and basin wide scale.

Document Type: Article
Funder compliance: info:eu-repo/grantAgreement/EC/FP7/308299
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2017JC013702
ISSN: 2169-9275
Related URLs:
Projects: RACE, NACLIM
Expeditions/Models/Experiments:
Date Deposited: 09 Apr 2018 10:41
Last Modified: 25 Feb 2019 14:20
URI: http://oceanrep.geomar.de/id/eprint/42643

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