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Title: Eddy-induced cross-shelf export of high Chl-a coastal waters in the SE Bay of Biscay
Authors: Rubio, Anna; Caballero, Ainhoa; Orfila, Alejandro and Hernandez-Carrasco, Ismael; Ferrer, Luis; Gonzalez, Manuel; Solabarrieta, Lohitzune; Mader, Julien
Citation: REMOTE SENSING OF ENVIRONMENT, 2018, 205, 290-304
Abstract: Different remote sensing data were combined to characterise a winter anticyclonic eddy in the southeastern Bay of Biscay and to infer its effects on cross-shelf exchanges, in a period when typical along shelf-slope currents depict a cyclonic pattern. While the joint analysis of available satellite data (infrared, visible and altimetry) permitted the characterisation and tracking of the anticyclone properties and path, data from a coastal high-frequency radar system enabled a quantitative analysis of the surface cross-shelf transports associated with this anticyclone. The warm core anticyclone had a diameter of around 50 km, maximum azimuthal velocities near 50 cm s(-1) and a relative vorticity of up to -0.45f. The eddy generation occurred after the relaxation of a cyclonic wind-driven current regime over the shelf-slope; then, the eddy remained stationary for several weeks until it started to drift northwards along the shelf break. The surface signature of this eddy was observed by means of high-frequency radar data for 20 consecutive days, providing a unique opportunity to characterise and quantify, from a Lagrangian perspective, the associated transport and its effect on the Chl-a surface distribution. We observed the presence of mesoscale structures with similar characteristics in the area during different winters within the period 2011-2014. Our results suggest that the eddy-induced recurrent cross-shelf export is an effective mechanism for the expansion of coastal productive waters into the adjacent oligotrophic ocean basin.
Keywords: Ocean mesoscale eddies; Cross-shelf transport; FSLE; Remote sensing; High-Frequency Radar; Lagrangian Coherent Structures; Lagrangian connectivity maps; LAGRANGIAN COHERENT STRUCTURES; SOUTHERN BAY; CIRCULATION PATTERNS; SURFACE CIRCULATION; LYAPUNOV EXPONENTS; SOUTHEASTERN BAY; SKILL ASSESSMENT; IN-SITU; MESOSCALE; TRANSPORT
Issue Date: 2018
Type: Article
Language: English
DOI: 10.1016/j.rse.2017.10.037
ISSN: 0034-4257
E-ISSN: 1879-0704
Funder: European Union's Horizon - Research and Innovation Framework Programme [654410]
LIFE-LEMA project [LIFE15 ENV/ES/000252]
Directorate of Emergency Attention and Meteorology of the Basque Government
Spanish Ministry of Economy and Competitiveness (National Plan for Scientific and Technical Research and Innovation) [CTM2013-45423-R, CTM2015-66225-C2-2-P]
Department of Environment, Regional Planning, Agriculture and Fisheries of the Basque Government
Spanish Government
Appears in Publication types:Artículos científicos

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