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Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 3
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New observations on the eutrophication of the Gulf of Lion due to the nutrient input by the Rhone River ArchiMer
Coste, A; Cadenes, A; Minas, H.
During the cruise EURHOGLI (Eutrophication by the Rhone of the Gulf of Lion) of the R.V. Le Noroit , a grid of stations covering the dilution area of the Rhone River has been carried out two times with a time interval of about two weeks. An exceptional growth during the two months preceding the cruise, has produced an important dilution effect over a wide spread areas. The absence of nutrients demonstrates their general consumption by biological activity. The tracer properties of the nutrient can be observed only in a small area near the mouth of the river. Nutrients are becoming the tracer of this dilution, and a great development of chlorophyll associated to this same area, show that nearly all the biological activity of nutrient assimilation is...
Tipo: Text Palavras-chave: France; Rhone R. Nutrient cycles Primary production River discharge Nutrients (mineral) Eutrophication.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1515.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
Registros recuperados: 3
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