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| Registros recuperados: 82 | |
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| Abrantes, F; Moita, Mt. |
| Diatom and coccolithophorid abundance and diatom assemblage composition found in the water column along the Portuguese margin, during upwelling and non-upwelling conditions, are compared to the distribution patterns observed in the recent sediments from the same area. The water column results indicate a one order of magnitude increase in phytoplankton biomass during upwelling conditions (summer), with diatoms being the most important contributors. Coccolithophorids, on the contrary, dominate the phytoplankton in winter (non-upwelling), The comparison of the upwelling and non-upwelling spatial distribution of these phytoplankton groups to their sedimentary record reveals the sediment record as a reflection of the upwelling situation, preserving most of its... |
| Tipo: Text |
Palavras-chave: Upwelling; Portugal; Diatomée; Colonne d'eau; Sédiment; Upwelling; Portugal; Diatom; Water column; Sediment. |
| Ano: 1999 |
URL: http://archimer.ifremer.fr/doc/00325/43630/43253.pdf |
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| Desbiolles, Fabien; Blanke, Bruno; Bentamy, Abderrahim; Grima, Nicolas. |
| Numerous studies have shown the primary importance of wind stress curl in coastal upwelling dynamics. The main goal of this new analysis is to describe the QuikSCAT surface wind stress curl at various scales in the Benguela and Canary upwelling systems. The dominant spatial pattern is characterized by cyclonic curl near continental boundaries and anticyclonic curl offshore, in association with equatorward alongshore (upwelling favorable) wind stress. At a smaller scale, we demonstrate the sensitivity of the QuikSCAT wind stress curl to coastal processes related to sea surface temperature (SST) mesoscale fluctuations by presenting a linear relationship between the curl and crosswind SST gradients. Despite the spatial and temporal sensitivity of the... |
| Tipo: Text |
Palavras-chave: Wind stress; Upwelling; SST-wind interactions. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00233/34412/32820.pdf |
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| Puillat, I; Lazure, Pascal; Jegou, Anne-marie; Lampert, Luis; Miller, P. |
| On the French continental shelf of the Bay of Biscay the variability of the surface salinity distribution has been mainly investigated at the seasonal and inter-annual scales. Here, new mesoscale features such as lower-salinity lenses observed in model results are investigated by hydrological measurements acquired during 8 cruises (1997-2000). These lenses are 50-80 km wide and similar to 30 m thick and occur during westerly to northerly wind events that push offshore the less saline water of river Plumes. These water masses detached from the coast are replaced with upwelled saltier water at the coast, so coastal upwelling is often observed at the same time along Landes and southern Brittany coasts. We show that in addition to the influence of seasonal and... |
| Tipo: Text |
Palavras-chave: River plume; Upwelling; Lens; Mesoscale; Salinity. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3958.pdf |
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| Lund-hansen, Lc; Vang, T. |
| Upwelling of cold. saline, and nutrient rich water was observed in late September 1999 along an east-west transect in the SW Kattegat. The Kattegat forms part of the transitional zone between the high saline North Sea and the low saline Baltic Sea. The upwelling occurred after an extended period of northward flow and eastern winds in the Kattegat, that changed into a southward flow as wind ceased. The upwelling was the result of a combination of high current speeds and bottom topography whereby the high-speed inflow water was forced towards the surface at the slope. Nutrient data show that the upwelling brought nutrient rich bottom water to the light exposed surface and a related strong (1943.5 ml(-1)) bloom of Pseudo-nitzschia pseudodelicatissima was... |
| Tipo: Text |
Palavras-chave: Courant; Upwelling; Front; Fluorescence; Chlorophylle-a; Inflow; Upwelling; Frontal structure; Fluorescence; Chlorophyll-a. |
| Ano: 2003 |
URL: http://archimer.ifremer.fr/doc/00321/43249/42980.pdf |
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| Diankha, Ousmane; Ba, Aliou; Brehmer, Patrice; Brochier, Timothee; Sow, Bamol Ali; Thiaw, Modou; Gaye, Amadou Thierno; Ngom, Fambaye; Demarcq, Herve. |
| We investigate Sardinella aurita and Sardinella maderensis recruitment success relative to the variability of oceanographic conditions in Senegalese waters using generalized additive models (GAM). Results show that recruitment of both species is marked by a strong intra-annual (seasonal) variation with minimum and maximum in winter and summer, respectively. Their interannual variations are synchronous until 2006 (recruitment decreasing), while from 2007 there is no synchrony. The model developed shows that sardinella recruitment variability is closely related to the tested environmental variables in the study area. However, the key environmental variables influencing the recruitment success are different for both species: the Coastal Upwelling Index and... |
| Tipo: Text |
Palavras-chave: Recruitment success; Sardinella aurita; Sardinella maderensis; Upwelling; West Africa. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00611/72299/71189.pdf |
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| Prego, R; Varela, M. |
| The Artabro Gulf (1 500 km(2) north-west of the Iberian Peninsula) has been studied based on data obtained in August 1993, under typical summer meteorological conditions (COPLA 893 cruise). This is the first study on the summer hydrography of the Artabro Gulf. During this season, the hydrography of this area is quite complex and must be understood in terms of three factors: 1) upwelling, 2) two different eastern North Atlantic Central Water (ENACW) water masses and 3) rias water exchange. A local wind-induced upwelling of ENACW, (subpolar) occurs off Prior Cape. The plume is located off the gulf coastline, but inside the continental shelf. The frontal zone, rich in nutrients and chlorophyll, is parallel to the gulf line, starting in the Prior region and... |
| Tipo: Text |
Palavras-chave: Upwelling; Ria; Cap Prior; Golfe Artabre; Mer Cantabrique; Upwelling; Ria; Prior Cape; Artabro Gulf; Cantabrian Sea. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00326/43675/43196.pdf |
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| Cossa, Daniel; Cotte Krief, Marie-hélène; Mason, Robert P.; Bretaudeau-sanjuan, Jane. |
| The purpose of this paper is to investigate the distribution and the relative importance of processes that affect mercury distribution in the water column at the shelf edge of the Celtic Sea, on the western European continental margin. The water column, down to 4500 m, was sampled during two cruises, one in winter 1994 and the other in June 1995, on eight stations. Total mercury concentrations ranged from 0.29 to 9.37 pM with the extreme values in the first 200 m. The highly variable concentrations in the surface layers are attributed to intense atmospheric-sea water exchange processes. The low concentrations encountered in the shelf water prelude any significant influence of continental waters in this area. In the mixed layer, biological uptake and... |
| Tipo: Text |
Palavras-chave: Regeneration; Atmospheric deposition; Deep profile; Upwelling; Atlantic ocean; Celtic Sea; Shelf break; Continental margin; Mercury. |
| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/2004/publication-660.pdf |
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| Stanisiere, Jean-yves; Mazurie, Joseph; Bouget, Jean-francois; Langlade, Aime; Gabellec, Raoul; Retho, Michael; Quinsat, Kevin; Leclerc, Emilie; Cugier, Philippe; Dussauze, Morgan; Menesguen, Alain; Dumas, Franck; Gohin, Francis; Augustin, Jean-marie; Ehrhold, Axel; Sinquin, Jean-marc; Goubert, Evelyne; Dreano, Alain. |
| The project “Risco”, supported by the “Pôle Mer” and funded by the Regional Council of Brittany, deals with specific risks of mortality of oysters, Crassostrea gigas, cultivated on the bottom, in a subtidal bay of South Brittany : the bay of Quiberon (56, France). Massive mortalities of oysters were reported in summer 2006 in this bay, exclusively located in the deep muddy area with a positive gradient eastward. A validated biogeochemical model was applied in order to simulate the dissolved oxygen over 2000-2006 : it revealed several episodes of hypoxia, more or less intense according to years, but with the same spatial distribution. This approach proved 2006 to be the most hypoxic year since 2000. The hypoxia was due to a rare conjunction of 3 factors :... |
| Tipo: Text |
Palavras-chave: Baie Quiberon; Crassostrea gigas; Huître; Mortalité; Croissance; Hypoxie; Oxygène; Modèle; Upwelling; Loire; Vilaine; Quiberon; Crassostrea gigas; Oyster; Mortality; Growth; Hypoxia; Oxygen; Model; DEB; Upwelling; Loire; Vilaine. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00180/29131/27535.pdf |
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| Registros recuperados: 82 | |
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