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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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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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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
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Production primaire dans le secteur indien de l'océan Antarctique en fin d'été ArchiMer
Jacques, G; Minas, M.
Tipo: Text
Ano: 1981 URL: http://archimer.ifremer.fr/doc/00121/23218/21057.pdf
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Productivity in tropical upwelling areas considered by a new method of analysis and determination. ArchiMer
Minas, H; Minas, M; Packard, T.
When in frontal zones of upwelling areas, a two-component mixing of nutrient rich upwelled water and oligotrophic offshore waters occurs, the amounts of nutrient consumed (- Delta N) and oxygen produced (+ Delta O2) can be evaluated by a detailed analysis of diagrams, in which salinity is the conservative parameter. By this same method, the corresponding T-S diagram allows a determination of the net heat gain of the upwelling water body during its offshore transport, and consequently the corresponding residence time in the photic zone. By integrating the nutrient consumption over the whole upwelling area, it is possible to obtain a more realistic average value of the productivity than with direct measurements of photosynthetic activity (14C and other...
Tipo: Text Palavras-chave: Primary production; Dynamical oceanography; T/S diagrams; Fertility; Biomass; Upwelling; Pelagic environment; Analytical techniques; Biological production.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1527.pdf
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The vicinity of the Strait of Gibraltrar: A source of a permanent high productivity ArchiMer
Minas, H; Coste, B; Minas, M.
Satellite infrared imagery shows that a cooling of the sea furface occurs in the Strait of Gibraltar and along the Spanish coast in the Alboran Sea. Since this cooling has an internal origin, it implicates also a nutrient transport into the photic zone. A high chlorophyll area off the Spanish coast, also shown by ocean color imagery (CZCS, Nimbus 7) demonstrate a high productivity. Hydrological and chemical observations made during the French "MEDIPROD IV" cruise on the Jean-Charcot allow to explain this high productivity. The high productivity entertains at mid-depth, by organic sedimentation, an oxygen minimum layer which corresponds to a nutrient maximum (phosphate and nitrate). This high biological activity is useful for hydrological purposes since the...
Tipo: Text Palavras-chave: MED; Gibraltar Strait Temperature effects Nitrates Phosphates Water mixing Water masses Tracers Oxygen minimum layer Satellite sensing Upwelling Nutrients (mineral) Primary production.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1516.pdf
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