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Registros recuperados: 6
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A Software Package and Hardware Tools for in situ Experiments in a Lagrangian Reference Frame ArchiMer
Doglioli, Andrea; Nencioli, Francesco; Petrenko, Anne; Rougier, Gilles; Fuda, Jean-luc; Grima, Nicolas.
The Lagrangian Transport Experiment (LATEX) was developed to study the influence of coupled physical and biogeochemical dynamics at the meso- and submesoscales on the transfers of matter and heat between the coastal zone and the open ocean. One of the goals of the Latex10 field experiment, conducted during September 2010 in the Gulf of Lion (northwest Mediterranean), was to mark a dynamical mesoscale feature by releasing a passive tracer [sulfur hexafluoride (SF6)] together with an array of Lagrangian buoys. The goal was to release the tracer in an initial patch as homogeneous as possible in the horizontal, and to study its turbulent mixing and dispersion while minimizing the contribution due to advection. For that, it was necessary to continuously adjust...
Tipo: Text Palavras-chave: Dispersion; Lagrangian circulation; Transport; Ship observations; Tracers; Experimental design; Software.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00155/26590/24719.pdf
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Avaliação da deposição da calda de pulverização em função da vazão e do tipo de bico hidráulico na cultura da soja - DOI: 10.4025/actasciagron.v30i2.1789 Agronomy
Boschini, Laércio; UNIOESTE; Contiero, Robinson Luiz; Universidade Estadual do Oeste do Paraná.; Macedo Junior, Eurides Kuster; UNIOESTE; Guimarães, Vandeir Francisco; UNIOESTE.
O experimento foi conduzido no município de Cascavel, Estado do Paraná, com a cultivar de soja CD 202, com o objetivo de avaliar a quantidade de calda depositada nas folhas da soja. Foram coletadas amostras, contendo 15 folhas por parcela, em cinco plantas, em diferentes extratos, sendo uma folha do extrato inferior; uma, do mediano, e uma, do superior, com a finalidade de avaliar a deposição da calda de pulverização em função da vazão e do tipo de bico. Os tratamentos foram constituídos por quatro bicos de pulverização (leque simples, duplo leque, duplo leque com injeção de ar e cone vazio) e três volumes de calda (100, 200 e 300 L há-1). O volume de calda que apresentou maiores deposições, nos diferentes extratos das plantas de soja, foi o de 300 L há-1;...
Palavras-chave: 5.01.03.05-9 Melhoramento Vegetal tecnologia aplicação; Pontas; Bicos; Volume; Traçadores 5.01.03.05-9 Melhoramento Vegetal application technology; Tips; Nozzles; Volume; Tracers.
Ano: 2008 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1789
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Biological and ecological factors related to trace element levels in harbour porpoises (Phocoena phocoena) from European waters ArchiMer
Lahaye, V; Bustamante, Paco; Law, J.r; Learmonth, J.a; Santos, M.b.; Boon, J.p.; Rogan, E; Dabin, W; Addink, M.j.; Lopez, A; Zuur, A.f.; Pierce, G.j.; Caurant, Florence.
Selected trace elements (Cd, Cu, Hg, Se, Zn) were measured in the kidneys and the liver of 104 harbour porpoises (Phocoena phocoena) stranded along the coasts of France, Galicia (Spain), Ireland, Scotland (UK), and the Netherlands. Generally, relatively low concentrations of toxic elements were encountered in the tissues of European porpoises, except for two individuals, which displayed high hepatic Hg concentrations. Also, elevated Cd levels obtained in Scottish porpoises could be related to their feeding preferences and this result suggests an increase of the proportion of cephalopods in their diet with latitude. Moreover, significant geographical differences were seen in hepatic Zn concentrations; the elevated Zn concentrations displayed by porpoises...
Tipo: Text Palavras-chave: Tracers; Multivariate analysis; Diet; Age; Marine mammals; Zinc; Cadmium; Mercury; Heavy metals.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2920.pdf
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Distribution and behavior of dissolved hydrogen sulfide in hydrothermal plumes ArchiMer
Radford Knoery, Joel; German, C; Charlou, Jean-luc; Donval, Jean-pierre; Fouquet, Yves.
Through the deep ocean, hydrothermal plumes disperse high concentrations of key chemical tracers including He-3, CH4, Mn, Fe, H2S, etc. This paper focuses on the distribution and behavior of total dissolved sulfide (sulfide hereafter) in hydrothermal plumes to show that its plume concentration decreases to subnanomolar a few kilometers from the vents. We also report on sulfide removal rates determined at in situ conditions; we observe that they are two orders of magnitude greater than for open ocean seawater, consistent with sulfide being detected only in the vicinity of hydrothermal vents. From our observations, we infer that the sole presence of sulfide in hydrothermal plumes locates active venting at the kilometer scale.
Tipo: Text Palavras-chave: Chemical oceanography; Mid ocean ridges; Metals; Helium isotopes; Methane; Tracers; Hydrogen sulphide; Plumes; Hydrothermal activity.
Ano: 2001 URL: https://archimer.ifremer.fr/doc/2001/publication-688.pdf
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Modelling green macroalgal blooms on the coasts of Brittany, France to enhance water quality management ArchiMer
Perrot, Thierry; Rossi, Nadege; Menesguen, Alain; Dumas, Franck.
First recorded in the 1970s, massive green macroalgal blooms have since become an annual recurrence in Brittany, France. Eutrophication (in particular to anthropogenic nitrogen input) has been identified as the main factor controlling Ulva ‘green tide’ events. In this study, we modelled Ulva proliferation using a two-dimensional model by coupling hydrodynamic and biological models (coined ‘MARS-Ulves’) for five sites along the Brittany coastline (La Fresnaye Bay, Saint-Brieuc Bay, Lannion Bay, Guissény Bay and Douarnenez Bay). Calibration of the biological model was mainly based on the seasonal variation of the maximum nitrogen uptake rate (VmaxN) and the half-saturation constant for nitrogen (KN) to reproduce the internal nutrient quotas measured in situ...
Tipo: Text Palavras-chave: 2D model; Ulva; Eutrophication; Brittany coastal waters; Tracers; Nutrient reductions.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00171/28268/26517.pdf
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Tracer stirring around a meddy: The formation of layering ArchiMer
Meunier, Thomas; Menesguen, Claire; Schopp, Richard; Le Gentil, Sylvie.
The dynamics of the formation of layering surrounding meddy-like vortex lenses is investigated using primitive equation (PE), quasigeostrophic (QG), and tracer advection models. Recent in situ data inside a meddy confirmed the formation of highly density-compensated layers in temperature and salinity at the periphery of the vortex core. Very high-resolution PE modeling of an idealized meddy showed the formation of realistic layers even in the absence of double-diffusive processes. The strong density compensation observed in the PE model, in good agreement with in situ data, suggests that stirring might be a leading process in the generation of layering. Passive tracer experiments confirmed that the vertical variance cascade in the periphery of the vortex...
Tipo: Text Palavras-chave: Circulation/ Dynamics; Advection; Dynamics; Atm/Ocean Structure/ Phenomena; Vortices; Models and modeling; Primitive equations model; Quasigeostrophic models; Tracers.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00255/36599/35160.pdf
Registros recuperados: 6
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