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Título : South-Eastern Bay of Biscay eddy-induced anomalies and their effect on chlorophyll distribution
Autor : Caballero, Ainhoa; Rubio, Anna; Ruiz, Simon; Le Cann, Bernard; Mader, Julien; Hernandez, Carlos; Testor, Pierre
Citación : JOURNAL OF MARINE SYSTEMS, 2016, 162, 57-72
Resumen : The analysis of deep-water glider hydrographic and fluorescence data, together with satellite measurements provides a new insight into eddy-induced anomalies within the South-Eastern Bay of Biscay, during summer. Two cyclonic eddies and a SWODDY have been observed in different glider transects and by means of different sources of satellite data. Vertical profiles reveal complex structures (characteristic of the second baroclinic mode): upward/downward displacement of the seasonal/permanent thermocline in the case of X13 and the opposite thermocline displacements in the case of the cyclones. This is a typical behaviour of mode-water and ``cyclonic thinny´´ eddies. A qualitative analysis of the vertical velocities in the anticyclone indicates that though geostrophy dominates the main water column, depressing the isopycnals, near the sea-surface the eddy-wind interaction affects the vertical currents, favouring Elcman pumping and upwelling. The analysis of the Theta-S properties corroborates that inside cyclones and between the 26 and 27 isopycnals, net downwelling occurs. These two types of intra-thermocline lenses appear to deeply impact the Chl-a fluorescence profiles, since the maximum Chl-a fluorescence is located just below the seasonal thermocline. The mean Chl-a fluorescence was higher in the anticyclone than within the cyclones and the mean for the entire study period; the highest values were observed in the centre of the anticyclone. These results are in agreement with previous findings concerning the SWODDY F90 and surrounding cyclones, located in the South-Western Bay of Biscay. Significant differences in the Theta-S properties of the two cyclonic mesoscale structures have been observed: higher temperatures and lower salinity in the easternmost cyclone. Finally, time variation of the salinity content of the shallowest water masses of the anticyclone (salinity decreasing over time), probably indicates advective mixing processes occurred during the mission. (C) 2016 Elsevier B.V. All rights reserved.
Palabras clave : Eddies; Bay of Biscay; Glider; Hydrography; Mesoscale; Eddy-wind; INTERNAL SOLITON PACKETS; SEA-SURFACE TEMPERATURE; AGEOSTROPHIC CIRCULATION; OCEAN CIRCULATION; ANTICYCLONIC EDDY; SOUTHEASTERN BAY; MESOSCALE EDDY; OMEGA-EQUATION; ALTIMETER DATA; ATLANTIC
Fecha de publicación : 2016
Editorial : ELSEVIER SCIENCE BV
Tipo de documento: Article
Idioma: Inglés
DOI: 10.1016/j.jmarsys.2016.04.001
URI : http://dspace.azti.es/handle/24689/127
ISSN : 0924-7963
E-ISSN: 1879-1573
Patrocinador: JERICO project from the European Union Seventh Framework Programme (FP7) \[262584]
Spanish Ministry of Economy and Competitiveness (National Plan for Scientific and Technical Research and Innovation) \[CTM2013-45423-R]
Department of Environment, Regional Planning, Agriculture and Fisheries of the Basque Government (Marco Program)
EGO COST Action \[ES0904]
FP7 GROOM project \[284321]
CNES
Aparece en las tipos de publicación: Artículos científicos



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