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Registros recuperados: 9
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Analyse des facteurs régissant la distribution des sels nutritifs dans la zone de remontée d'eau des côtes mauritaniennes ArchiMer
Coste, B; Minas, Hj.
Tipo: Text
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00121/23196/21041.pdf
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Campagne Paciprod: Production des upwellings cotiers (Peru) et equatoriaux (Zones des iles des Galapagos) ArchiMer
Minas, Hj; Coste, B.
Two types of stations were occupied: CTD hydrocast stations for water chemistry and continuous vertical profiles of chemical parameters in the upper 200 meter layer (SHET profiles). Selected biological stations were carried out mainly for primary productivity (in situ super(14)C method), phytoplankton biomass and photometric measurements (quantum- and spectroirradiance-meters) in the photic zone. Zooplankton was collected at nearly all the stations of the cruise in order to determine biomass and species composition. A long Peru-Galapagos connecting section with 19 stations was carried out for water chemistry down to 2000 meters.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00268/37935/36016.pdf
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Conditions hydrologiques, chimiques et production primaire dans les upwellings du Perou et des iles Galapagos, en regime d'hivers austral (Campagne Paciprod) ArchiMer
Minas, Hj; Coste, B; Minas, M; Raimbault, P.
The Paciprod Cruise of the R/V Jean-Charcot was devoted to study upwellings and their biological consequences in the coastal area of Peru and in the equatorial divergence zone around the Galapagos Archipelago. Main objectives, methodology and shipboard experimentations have been reported.
Tipo: Text
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00268/37956/36037.pdf
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Conditions hydrologiques et chimiques associées à l'upwelling côtier du Portugal en fin d'été ArchiMer
Coste, B; Fiuza, Afg; Minas, Hj.
Tipo: Text
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00110/22127/19763.pdf
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Distribution et évolution des éléments nutritifs dans le secteur indien de l'Océan Antarctique en fin de période estivale ArchiMer
Lecorre, P; Minas, Hj.
Tipo: Text
Ano: 1983 URL: http://archimer.ifremer.fr/doc/00120/23124/20971.pdf
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Les elements nutritifs dans le bassin occidental de la Mediterranee. Bilan des echanges avec l'ocean Atlantique a Gibraltar ArchiMer
Coste, B; Le Corre, P; Minas, Hj; Morin, P.
Nutrient measurements were performed during the Mediprod IV cruise of the R.V. Jean Charcot in the whole western basin of the Mediterranean Sea, special attention being paid to the Alboran Sea and to the Strait of Gibraltar. From these data, new values for the nutrient budget of the Mediterranean Sea are obtained. It appears that dissolved organic nitrogen (DON) contributes to the total nitrogen input in an amount of more than 50%, and that the river runoff contribution accounts for less than 10% of the total nutrient input. High values of the N : P ratio in the Mediterranean Sea (> 20) are explained by the nitrogen and phosphorus content of the superficial layers of the water inflow into the Mediterranean Sea, together with mineralization processes...
Tipo: Text
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00267/37832/35913.pdf
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Net community production in high nutrient-low chlorophyll waters of the tropical and antarctic oceans - grazing vs iron hypothesis ArchiMer
Minas, Hj; Minas, M.
An analysis of tropical upwelling systems shows a great range in the rate of increase of the standing stock expressed in terms of the water column chlorophyll content. Grazing appears to be the main factor responsible for lowering the rate of increase, especially in moderate and strong High Nutrient-Low Chlorophyll (HNLC) waters. A simple model comparing Net Community Production (NCP) rates with observed chlorophyll increase rates, leads us to conclude that phytoplankton population must present high specific growth rates on a daily rhythm in order to overcome grazing. Maximum specific growth rates (V(max)) calculated for daily total production (TP) are, in the two main upwelling areas, 137 d-1 off NW Africa and 1.04 d-1 off Peru. For extreme HNLC...
Tipo: Text Palavras-chave: NUTRIENTS; NEW PRODUCTION; GRAZING; TROPICAL OCEAN; ANTARCTIC.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/00100/21149/18768.pdf
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Oxygenation physique et biologique de la Mediterranee nord-occidentale en hiver et au printemps ArchiMer
Minas, Hj; Bonin, M C.
Strong vertical mixing during winter in the northwestern Mediterranean Sea occurs with simultaneous ventilation of water masses. In the high turbulent deep water formation chimneys, with homogenous density from the sea surface to the bottom, the oxygen input, limited to the most intense winter period, reaches almost 10 super(3) l O sub(2) m super(-2). From Redfield's exchange coefficient, an oxygen flux of about 12 l m super(-2) d super(-1) can be calculated. Nearly the same flux can be derived from Broecker and Peng's piston velocity data, but in order to reach this value one has to assume that the sea surface film thickness averages 10 mu m. Biological oxygen fluxes produced by photosynthesis or respiration are almost negligible in comparison with the...
Tipo: Text
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00267/37807/35888.pdf
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Production de base et de recyclage; une revue de la problematique en Mediterranee nord-occidentale ArchiMer
Minas, Hj; Minas, M; Coste, B; Gostan, J; Nival, P; Bonin, M P.
Apparent nutrient consumption and oxygen production, representing net community production, appear among other methods to offer a valuable approach to new production. Net community production determinations were carried out a long time ago in the Mediterranean Sea, with the idea of comparing them with super(14)C-productivity measurements. Our main objective here is to summarize the results of these studies and to review them in relation to the latest discussions concerning productivity of the Sargasso Sea. In the main oligotrophic coastal waters of the Ligurian Sea, there is no evidence for positive net production in the subsurface oxygen maximum associated with the summer thermocline (Minas, Coste, 1964), and Reid's (1962) physical explanation of the...
Tipo: Text
Ano: 1988 URL: http://archimer.ifremer.fr/doc/00267/37833/35914.pdf
Registros recuperados: 9
Primeira ... 1 ... Última