The Portugal coastal counter current off NW Spain: new insights on its biogeochemical variability期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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The Portugal coastal counter current off NW Spain: new insights on its biogeochemical variability

Authors:	XA Álvarez-Salgado FG FigueirasFF Pérez S GroomE Nogueira AV BorgesL Chou CG CastroG Moncoiffé AF RíosAEJ Miller M FrankignoulleG Savidge R Wollast

Institution:	^a CSIC, Instituto de Investigacións Mariñas, Eduardo Cabello 6, 36208 Vigo, Spain ^b Plymouth Marine Laboratory, Prospect Place, Plymouth PL1 3DH, UK ^c IEO, Centro Oceanográfico de Gijón, Avda. Príncipe de Asturias 70 bis, 33212 Gijon, Spain ^d Unité d’Océanographie Chimique, Mare, University of Liège, Sart Tilman B5, B-4000 Liege, Belgium ^e Laboratoire d’Océanographie Chimique et Géochimie des Eaux, Université Libre de Bruxelles, Campus de la Plaine—CP 208, B-1050 Brussels, Belgium ^f Queen’s University of Belfast, School of Biology and Biochemistry, Marine Laboratory, Portaferry, Co. Down, BT22 1PF, UK ^g BODC, Bidston Observatory, Bidston Hill, Prenton CH43 7RA, UK ^h SAMS, Dunstaffnage Marine Laboratory, University of the Highlands and Islands project, Oban, Argyll PA34 4AD, UK

Abstract:	Time series of wind-stress data, AVHRR and SeaWiFS satellite images, and in situ data from seven cruises are used to assemble a coherent picture of the hydrographic variability of the seas off the Northwest Iberian Peninsula from the onset (September-October) to the cessation (February-May) of the Portugal coastal counter current (PCCC). During this period the chemistry and the biology of the shelf, slope and ocean waters between 40° and 43°N have previously been undersampled. Novel information extracted from these observations relate to: 1. The most frequent modes of variability of the alongshore coastal winds, covering event, seasonal and long-term scales; 2. The conspicuous cycling between stratification and homogenisation observed in PCCC waters, which has key implications for the chemistry and biology of these waters; 3. The seasonal evolution of nitrite profiles in PCCC waters in relation to the stratification cycle; 4. The Redfield stoichiometry of the remineralisation of organic matter in Eastern North Atlantic Central Water (ENACW)—the water mass being transported by the PCCC; 5. The separation of coastal (mesotrophic) from PCCC (oligotrophic) planktonic populations by a downwelling front along the shelf, which oscillates to and fro across the shelf as a function of coastal wind intensity and continental runoff; and 6. The photosynthetic responses of the PCCC and coastal plankton populations to the changing stratification and light conditions from the onset to the cessation of the PCCC.

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