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| Fripiat, Francois; Corvaisier, Rudolph; Navez, Jacques; Elskens, Marc; Schoemann, Veronique; Leblanc, Karine; Andre, Luc; Cardinal, Damien. |
| Regional and seasonal variability of the Si dissolution: production ratios in the surface ocean have not been well assessed. Here, we propose a new method for determining these rates, using the Si-30-isotopic dilution technique with a high-resolution sector field inductively coupled plasma mass spectrometer (HR-SF-ICP-MS). Relative analytical precision of the isotopic measurement is better than 1%, similar to that obtained by thermal ionization-quadrupole mass spectrometry (TIMS). Accuracy and reproducibility of the isotopic measurements have been checked on artificial and natural solutions by intercomparison between two HR-SF-ICP-MS instruments and one TIMS. Measurements of real Si production and dissolution rates are illustrated for two contrasted... |
| Tipo: Text |
Palavras-chave: Isotopic fractionation; Southern ocean; Acid uptake; Waters; Phytoplankton; Environments; Biosilica; Recovery; Balance; Tracer. |
| Ano: 2009 |
URL: https://archimer.ifremer.fr/doc/00205/31607/30033.pdf |
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| Ganachaud, Alexandre; Gourdeau, Lionel; Kessler, William. |
| The South Equatorial Current (SEC), the westward branch of the South Pacific subtropical gyre, extends from the equator to 30 degrees S at depth. Linear ocean dynamics predict that the SEC forms boundary currents on the eastern coasts of the South Pacific islands it encounters. Those currents would then detach at the northern and southern tips of the islands, and cross the Coral Sea in the form of jets. The Fiji Islands, the Vanuatu archipelago, and New Caledonia are the major topographic obstacles on the SEC pathway to the Australian coast. Large-scale numerical studies, as well as climatologies, suggest the formation of three jets in their lee: the north Vanuatu jet (NVJ), the north Caledonian jet (NCJ), and the south Caledonian jet (SCJ), implying a... |
| Tipo: Text |
Palavras-chave: Tropical Pacific ocean; Depth integrated flow; Zonal jets; Coral sea; Circulation; Waters; Variability; Generation; Island; Heat. |
| Ano: 2008 |
URL: https://archimer.ifremer.fr/doc/00207/31809/30221.pdf |
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| Labry, Claire; Youenou, Agnes; Delmas, Daniel; Michelon, Pascale. |
| The speciation of particulate phosphorus (TPP) into inorganic (PIP) and organic phosphorus (POP), has been scarcely investigated in suspended particulate matter (SPM), contrary to numerous sediment studies. This work evaluates the actual capacity of methods for TPP, POP and PIP determination in SPM to measure efficiently and specifically each pool. Methods were tested on a range of plankton-associated organic and inorganic P compounds, on microalgal cultures and estuarine samples. Then results are specifically discussed reviewing P speciation in phytoplankton. For TPP analysis, the method of Solorzano and Sharp (1980) is recommended compared with that of Aspila et al. (1976), originally dedicated to sediment, as there is one step less, the protocol is more... |
| Tipo: Text |
Palavras-chave: Phosphorus; Speciation; Waters; Phytoplankton; HTC; CWO. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00149/26046/26385.pdf |
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| Menna, M.; Poulain, P. M.. |
| Data from 38 Argo profiling floats are used to describe the intermediate Mediterranean currents for the period October 2003-January 2010. These floats were programmed to execute 5-day cycles, to drift at a neutral parking depth of 350 m and measure temperature and salinity profiles from either 700 or 2000 m up to the surface. At the end of each cycle the floats remained at the sea surface for about 6 h, enough time to be localised and transmit the data to the Argos satellite system. The Argos positions were used to determine the float surface and intermediate displacements. At the surface, the float motion was approximated by a linear displacement and inertial motion. Intermediate velocities estimates were used to investigate the Mediterranean circulation... |
| Tipo: Text |
Palavras-chave: Surface circulation; Tyrrhenian sea; North atlantic; Variability; Deep; Currents; Floats; Features; Strait; Waters. |
| Ano: 2010 |
URL: https://archimer.ifremer.fr/doc/00204/31477/29894.pdf |
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| Fuentes, M.; Valladares, J.; Grass, G.; Pico, Y.. |
| La microbiota de un producto pesquero incluye la identificación de las especies bacterianas de interés para la salud pública durante el cultivo, cosecha y transportación. El presente trabajo determinó la calidad bacteriológica de Oreochromis spp. (tilapia roja), de cultivo intensivo en jaulas flotantes de ambientes dulceacuícolas. El estudio se efectuó en la presa “La Cidra”, al Norte de Matanzas en período de seca y de lluvia. Se realizaron cuatro muestreos de 60 muestras que se conservaron en nevera con hielo durante 3 h hasta su análisis. Se determinó el recuento total de microorganismos a 30 °C, el número de coliformes fecales y Escherichia coli; la presencia de Listeria monocytogenes, Salmonella spp., Streptococcus sp., Pseudomonas spp., Aeromonas... |
| Tipo: Journal Contribution |
Palavras-chave: Aquaculture; Floating cages; Waters. |
| Ano: 2011 |
URL: http://hdl.handle.net/1834/4662 |
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| Coram, Alex. |
| This paper uses a control theory approach to analyse the collectively optimal rate of extraction along a river system and constructs a bidding mechanism that would produce the required prices at each point. It also analyses some characteristics of this mechanism. This approach brings some new perspective to existing work on externalities. It also helps bring to light some aspects of the system as a whole that may be less obvious in a more piecemeal analysis, including the fact that there may not be an optimal solution to the allocation problem. Although the bidding mechanism may be difficult to implement, it may be possible to design various forms of hybrid schemes that have practical value. |
| Tipo: Journal Article |
Palavras-chave: Control theory; Mechanism design; Optimal allocation; Rights markets; Waters; Resource /Energy Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/116974 |
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