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Registros recuperados: 39
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A Lagrangian numerical investigation of the origins and fates of the salinity maximum water in the Atlantic ArchiMer
Blanke, Bruno; Arhan, Michel; Lazar, A; Prevost, Gwenaelle.
The origins and fates of the Atlantic salinity maximum water (SMW), formed through excess evaporation in the tropics and subtropics of both hemispheres, are studied using monthly mean outputs of a numerical simulation of the world ocean climatological circulation. After defining formation domains from the surface salinity field and the vertical stratification, a Lagrangian technique is used to estimate the formation rates and main pathways in each hemisphere and the role of this water in the framework of the warm water return flow of the meridional overturning cell. Formation rates around 9 and 11 Sv are found in the Southern and Northern Hemispheres, respectively. While the export of the southern SMW from its formation area is realized by the western...
Tipo: Text Palavras-chave: Atlantic ocean; Lagrangian method; Numerical simulation; Salinity; Sea water.
Ano: 2002 URL: https://archimer.ifremer.fr/doc/2002/publication-769.pdf
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A room temperature procedure for the manual determination of urea in seawater OMA
Goeyens, L.; Kindermans, N.; Yusuf, M.A.; Elskens, M..
Several earlier studies underpin the important role of dissolved organic matter and more particularly urea in phytoplanktonic nitrogen uptake fluxes. Generally, the determination of urea concentrations relies on the formation of an imidazolone-thiosemicarbizide complex, a complexation which requires very accurate temperature control when carried out at high temperature. It is also possible, however, to obtain reliable results with a room temperature procedure. The measured abundances for both complexation at high temperature (85 degree C, 20 min) and at ambient temperature (22 degree C, 72 h) are closely comparable. Lower values are observed for temperatures <10 degree C though. Moreover, a comparison of both techniques reveals similar precision...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dissolved organic carbon; Sea water; Temperature; Urea; Water analysis.
Ano: 1998 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7858
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Accelerated ageing of polyurethanes for marine applications ArchiMer
Davies, Peter; Evrard, Guy.
Polyurethanes are frequently used in underwater applications. They are required to resist the marine environment over long periods of immersion but the multiplicity of resin formulations makes material selection difficult. Accelerated tests are essential to guarantee long term integrity. This paper presents results from an experimental study in which polyurethane samples of two hardnesses, 40 and 90 Shore A, have been subjected to immersion in artificial sea water for periods up to two years at temperatures from 50 to 100 degrees C. In parallel samples have been immersed at sea in the Brest Estuary for up to five years. Mechanical properties have been measured on tensile specimens after ageing. The accelerated test results and FTIR analysis indicate that...
Tipo: Text Palavras-chave: Accelerated test; Sea water; Ageing; Marine; Polyurethane.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2822.pdf
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Ageing mechanism and mechanical degradation behaviour of polychloroprene rubber in a marine environment: Comparison of accelerated ageing and long term exposure ArchiMer
Le Gac, Pierre-yves; Le Saux, V.; Paris, M; Marco, Y..
Polymers are widely used in marine environments due to their excellent properties and good weathering resistance. Despite this extensive use, their long term behaviour in such an aggressive environment is still not well known. To assess the polymer durability within reasonable durations, it is essential to perform accelerated ageing tests to accelerate the degradation kinetics but without any modification of the degradation process. This study therefore proposes and validates accelerated ageing tests to study marine ageing of a silica-filled chloroprene rubber (CR) used for offshore applications. Several accelerated ageing protocols are investigated for temperatures ranging from 20 to 80 degrees C in renewed natural seawater. The ageing consequences are...
Tipo: Text Palavras-chave: Chloroprene rubber; Degradation; Sea water; Silica; Accelerated ageing; Natural ageing.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00073/18429/20232.pdf
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Apparent resistivity and spectral induced polarization in the submarine environment Anais da ABC (AABC)
SOUZA,HERCULES DE; SAMPAIO,EDSON E. S..
Relatively few investigations have employed electrical methods in the submarine environment, which may be promising for mineral deposits or threatened by environmental problems. We have measured the electric field using both disk and bar electrodes in the sea water at three different levels: sea surface, seven meters deep, and sea bottom at a depth of ten meters, employing a 2 m spacing dipole-dipole array with 7 array spacings of investigation, and 13 values of frequencies at steps of (2N hertz, N = -2, -1, 0, 1, 2,.....10). The measurement allowed the analysis of the electric field as a function of frequency and spacing, and of the spectral induced polarization. Modelling and interpretation of the apparent resistivity yielded a good fit with previous...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Complex apparent resistivity; Induced polarization; Forward modeling; Sea water.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000300011
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Aquaculture of red tilapia Oreochromis sp. in marine environments: State of the art. ArchiMer
Watanabe, W; Ernst, D; Olla, B; Wicklund, R.
The Caribbean Marine Research Centre is conducting research on the development of methods for intensive culture of euryhaline red tilapias in marine environments for application to Caribbean islands and similar regions with limited freshwater resources.
Tipo: Text Palavras-chave: Survival; Growth; Eggs; Brood stocks; Incubation; Brackish water; Seed (aquaculture); Food conversion; Hatcheries; Controlled conditions; Diets; Floating cages; Sea water; Salinity tolerance; Intensive culture; Fingerlings.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/acte-1493.pdf
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Aspectos generales sobre la estructura térmica superficial del mar, de la zona comprendida entre el golfo de Penas y la boca occidental del estrecho de Magallanes OceanDocs
Boré, D.; Barbieri, M.A.; Catasti, V..
This study was carried out within the Project Cimar-Fiordo 2. The general objective was to describe the sea surface temperature in the zone between 46º LS and 52º LS, and from the 73º 52’ LW to the 76º 30’ LW, considering the channel and fjord zone. The analysis was based on satellite images of sea surface temperature. The images used came from the AVHRR radiometer of the NOAA satellite, from the year 1995 to 1998. The cartographic representation and the analysis of the seasonal variability of the sea surface temperature was made using the software of the Geographical Information System (GIS), named IDRISI. The zone was with clouds during all the period of study, mainly in autumn. With the available images it was possible to observe a big difference...
Tipo: Journal Contribution Palavras-chave: Water temperature; Fjords; GIS; Satellite sensing; Radiometers; Surface temperature; Sea water; Thermal structure; Water temperature; Fjords; Radiometers; Sea water.
Ano: 2001 URL: http://hdl.handle.net/1834/1578
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Aspectos químicos del sistema bentónico del golfo San Jorge, Argentina (2005-2010) OceanDocs
Fernández, M.B.; Cucchi Colleoni, A.D..
Chemical aspects of the San Jorge Gulf benthic system, Argentina (2005-2010). A new contribution on the chemical aspects of the San Jorge Gulf benthic system in the distribution area of shrimp Pleoticus muelleri (Spence Bate, 1888) during 2005-2010 is presented. Concentration of dissolved oxygen in bottom water and mix layer and of total organic matter (TOM), total organic carbon (TOC), total nitrogen (TN), chlorophyll a (Chl a) and phaeopigments (Phaeo) in surficial sediments were analyzed. The origin and nutritional value of TOM deposited were also assessed through the C:N ratio. Water samples were collected during the Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP) seasonal research cruises in the period 2005-2010. Sediment samples...
Tipo: Journal Contribution Palavras-chave: Chemical composition; Sediments; Dissolved oxygen; Sea water.
Ano: 2013 URL: http://hdl.handle.net/1834/5506
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Biodegradation du petrole en mer. Influence de l'apport d'azote et de phosphore sous forme minerale ArchiMer
Lepetit, J; Guiot, J; Martin, Y; Tagger, S.
To exploit the presence in the sea of microorganisms capable of degrading petroleum products a mineral fertilizer, containing immediatly assimilable nitrogen and phosphorus compounds, was used to increase the microbial population and therefore, the degradation potential of treated polluted waters. The fertilizer supply caused an increase in heterotrophic and hydrocarbon-splitting bacteria and an increase in the phytoplanktonic biomass. The latter is characterized by an increase in a few selected species; it constitutes an important supply of organic substances, and it is responsible for increasing the dissolved oxygen which is essential for petroleum oxidation. Supplying the fertilizer results in an increase in the treated water degradation potential and a...
Tipo: Text Palavras-chave: Bacteria; Microorganisms; Heterotrophic organisms; Phosphorus compounds; Nitrogen compounds; Fertilizers; Hydrocarbons; Biodegradation; Sea water.
Ano: 1984 URL: http://archimer.ifremer.fr/doc/1984/acte-1020.pdf
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Características químicas de las aguas marinas ecuatorianas durante 1988 OceanDocs
Rodríguez de Morán, A..
Se presenta un estudio de las características de las aguas ecuatorianas, mediante el análisis químico de las muestras obtenidas durante los cruceros I y II realizados a bordo del BAE ORION en los meses de Agosto y Diiciembre de 1988. Se realiza las caracterización de los diferentes ambientes hasta los 100 m de profundidad, estableciéndose el comportamiento de los parámetros hidroquímicos, tanto en su distribución horizontal geográfica, como vertical en la columna de agua y su relación con el frente Ecuatorial. Se establece, en forma general, la influencia de la presencia de la Corriente de Humboldt, en la concentración y distribución de los parámetros en el CO-I-88; y el debilitamiento de la misma en el CO-II-88. Evideciándose por lo tanto, aguas más...
Tipo: Journal Contribution Palavras-chave: Chemical oceanography; Sea water; Ocean currents; Ocean currents; Chemical oceanography; Sea water; Http://aims.fao.org/aos/agrovoc/c_12883; Http://aims.fao.org/aos/agrovoc/c_1516; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 1990 URL: http://hdl.handle.net/1834/2167
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Chemical environment of the hydrothermal mussel communities in the Lucky Strike and Menez Gwen vent fields, Mid Atlantic ridge ArchiMer
Sarradin, Pierre-marie; Caprais, Jean-claude; Riso, Ricardo; Kerouel, Roger; Aminot, Alain.
Water samples were collected around the communities of a hydrothermal mussel, Bathymodiolus sp., in the Lucky Strike (1700 m depth) and Menez Gwen (850 m depth) areas, Mid Atlantic Ridge, and analysed for chemical constituents. The environment surrounding the organisms consists in sea water (88 to 100%) mixed with hydrothermal fluid with pH between 6.2 and 8, Sigma S (H2S + HS-) concentrations from 0 to 62 mu mol l(-1). High dissolved organic carbon (DOC) concentrations suggest a highly productive ecosystem. Production of ammonium and DOG, consumption of nitrate and sulfide in the vicinity of the organisms are among the environmental changes found in relation with local biological activity. Concentrations of Cu and Pb were high, implying that the organisms...
Tipo: Text Palavras-chave: Environment; Sea water; Hydrothermal vents; Mussels.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00147/25847/23968.pdf
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Compréhension des mécanismes d'adhésion des biofilms en milieu marin en vue de la conception de nouveaux moyens de prévention ArchiMer
Rubio, Celine.
Biofilm formation on surfaces immersed in sea water induces equipment damages. Recently, studies focused on the environmental impact of antifouling paints have shown that some active chemical compounds are harmful to the aquatic environment. Hence, it appears fundamental to study physico-chemical interactions existing between marine bacteria and various substrata to conceive new ecological products or antifouling processes. First, we model an artificial primary organic film, formed by the adsorption of BSA and polysaccharide, as close as the one formed in natural seawater. This organic film is heterogeneous (only 42% of the surface is covered) and organic adsorption occurs in a multi-layer scheme, molecules bounded each others by calcium and magnesium...
Tipo: Text Palavras-chave: Sea water; Marine bacteria; Physico chemical characterisation; MATS; XPS; IRAS; Adsorption; Bacterial adhesion; Biofim; Eau de mer; Bactéries marines; Caractérisation physicochimique; MATS; XPS; IRRAS; Adsorption; Adhésion bactérienne; Biofilm.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/these-222.pdf
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Concevoir des structures pour l'élevage des poissons en mer ArchiMer
Priour, Daniel.
The quick evolution of fish farming in Europe, and its development towards the open sea needs suitable farming tools. These tools must withstand the difficult sea states, but they must be easy to use, well adapted to the fish farming and not too much expensive. This book helps the design of such tools. It defines the solicitations of the sea on all the structures, and presents rules and methods to control these solicitations. Here, a structure is composed of a rearing support, a mooring system and equipments. This book describes these components, class them and gives lists of providers. The rearing support can be a cage, a group of cages or a boat. The support can float or to be submersible. The mooring system can be made up ropes, chains, anchors,...
Tipo: Text Palavras-chave: Aquaculture equipment; Mooring systems; Anchoring; Aquaculture techniques; Structures; Sea water; Life support systems; Aquatic environment; Cage culture; Marine technology; Rearing; Fish culture.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-1667.pdf
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Contamination des milieux aquatiques par les substances pharmaceutiques et cosmétiques - Etat des lieux et perspectives ArchiMer
Collette-bregand, Maude; James, Alice; Munshy, Catherine; Bocquene, Gilles.
This document reports a survey of the aquatic contamination by cosmetics and medicinal products for human and veterinary uses. The contamination of the continental, estuary and coastal waters by these substances gives rise to questions on environmental risk assessment and management. Among the pharmaceutical classes involved, substances such as anti-inflammatory drugs, steroid hormones, antibiotics and hypolipemiants are of particular concern. Present regulations do not take into account the medical effluents in the environment. A significant part of these substances is not destroyed in water treatment plants whereas veterinary substances are directly spread in the environment. Some molecules occur in particularly high concentrations as shown for...
Tipo: Text Palavras-chave: Médicaments; Produits pharmaceutiques; Vétérinaires; Cosmétiques; Émergents; Évaluation du risque environnemental; Risque chimique; Milieu marin; Pharmaceuticals; Ecotoxicity; Environmental risk assessment; Prioritization methods; Endocrine disruptors; Sewage; Sea water.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00066/17773/15295.pdf
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Cultivo a baja salinidad de postlarvas de Litopenaeus vannamei con diferentes relaciones de K+/ Na+ OceanDocs
Cabrera Machado, J. E.; Jaime Ceballos, B..
An experiment was designed totally randomized to study the influence of different rate of Na+/K+ (5, 30, 55, 70, 95 and 120). Massive mortality was presented to the sixth day of the treatments I and III (Na+/K+=5 and Na+/K+=120), to the seventh day the treatment V (Na+/K+=95) and to the eighth day of the treatment IV (Na+/K+=70). The treatments II and III (Na+/K+=30 and Na+/K+=55 respectively) they stayed in the time, when indicating a bigger tolerance of the postlarvae in these ranges of Na+/K+; however, the mortality of the treatment II were significantly bigger (p <0.01) that in the treatment III, in which 90-100% survival was observed. The results indicate a better physiologic answer of L. vannamei postlarvae to relationships Na+/K+...
Tipo: Preprint Palavras-chave: Marine shrimp culture; Sea water; Prawns and shrimps; Http://aims.fao.org/aos/agrovoc/c_6156.
Ano: 2011 URL: http://hdl.handle.net/1834/4149
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Description and modeling of polyurethane hydrolysis used as thermal insulation in oil offshore conditions ArchiMer
Le Gac, Pierre-yves; Choqueuse, Dominique; Melot, D..
Polymers are widely used for passive thermal insulation coatings on steel pipe in offshore oil and gas production. In this industry, structures used in deep sea have to be reliable, as they are in service for more than 20 years in a very severe environment: sea water, hydrostatic pressure and temperature gradient. One of the main questions is how to test and predict the lifetime of such structures in the laboratory? This study presents one approach that has been developed to characterize and predict the degradation of polymers used as thermal insulation materials. This paper is dedicated to polyurethane (polyether based) degradation in sea water at high temperature. Ageing has been performed in natural sea water under hydrostatic pressure at temperatures...
Tipo: Text Palavras-chave: Polyurethane; Hydrolysis; Accelerated ageing; Sea water; Coating; Offshore.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00160/27132/25330.pdf
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Detection of polycyclic aromatic hydrocarbon (PAH) compounds in artificial sea-water using surface-enhanced Raman scattering (SERS) ArchiMer
Peron, Olivier; Rinnert, Emmanuel; Lehaitre, Michel; Crassous, Philippe; Compere, Chantal.
This paper reports an accurate synthesis of surface-enhanced Raman scattering (SERS) active substrates, based on gold colloidal monolayer, suitable for in situ environmental analysis. Quartz substrates were functionalized by silanization with (3-mercaptopropyl)trimethoxysilane (MPMS) or (3-aminopropyl)trimethoxysilane (APTMS) and they subsequently reacted with colloidal suspension of gold metal nanoparticles: respectively, the functional groups SH and NH2 bound gold nanoparticles. Gold nanoparticles were prepared by the chemical reduction of HAuCl4 using sodium tricitrate and immobilized onto silanized quartz substrates. Active substrate surface morphology was characterized with scanning electron microscopy (SEM) measurements and gold nanoparticles...
Tipo: Text Palavras-chave: Sensor; Sea water; PAH detection; SERS; Silanization; Gold nanoparticles.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6616.pdf
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Determinación de niveles actuales de 137Cs en aguas marinas en el trayecto Guayaquil-Isla Greenwich y en algunos componentes del ecosistema acuático en Punta Fort William OceanDocs
Rojas, P..
Con el fin de evaluar el impacto de la contaminación radiactiva atmosférica sobre las masas de agua del Continente Antártico, originado en los procesos de fisión de la industria nuclear como también por las últimas explosiones nucleares, efectuadas de septiembre de 1995 a enero de 1996 en la Polinesia Francesa, se realizó un estudio de la actividad actual del 137Cs en agua superficial de mar. Se tomaron las muestras en el trayecto Guayaquil-Isla Greenwich; las mismas que después de ser analizadas mediante espectroscopía Gamma de alta resolución, se determina que la concentración de Cs se encuentra dentro de los límites permisibles.
Tipo: Journal Contribution Palavras-chave: Radioactive contamination; Sea water; Polar waters; Radioactive contamination; Sea water; Http://aims.fao.org/aos/agrovoc/c_28321; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 1998 URL: http://hdl.handle.net/1834/3845
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Distribución espacial del amonio en fiordos y canales comprendidos entre Puerto Montt y Laguna San Rafael en período de primavera OceanDocs
Prado-Fiedler, R..
An oceanographic expedition was carried out between October 18th and November 15th 1995 in the inlets region and fjords located between Puerto Montt (41° 20’S and San Rafael Lagoon (46° 40’ S) in Southern Chile. The main purpose of the present work is to characterise the spatial distribution of ammonium and its concentration range in the studied region during spring onset. Water samples were collected from a total of 101 oceanographic stations of the expedition Cimar-Fiordo 1. The main part of the water body showed concentrations lower than 1 µmol/L. The higher ammonium concentrations were found in the continental fjords, specially in the area situated south of the narrows of Meninea island, where subsurface maximums greater than 2 µmol/L were found. The...
Tipo: Journal Contribution Palavras-chave: Fjords; Water properties; Ammonia; Water content; Channels; Water analysis; Water sampling; Surface layers; Core layers (water); Sea water; Fjords; Water content; Ammonia; Water analysis; Sea water; Http://aims.fao.org/aos/agrovoc/c_16314; Http://aims.fao.org/aos/agrovoc/c_15852; Http://aims.fao.org/aos/agrovoc/c_349; Http://aims.fao.org/aos/agrovoc/c_16064; Http://aims.fao.org/aos/agrovoc/c_6903.
Ano: 2000 URL: http://hdl.handle.net/1834/1576
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Durabilité des composites pour énergie marine renouvelable ArchiMer
Davies, Peter; Boisseau, A.; Choqueuse, Dominique; Thiebaud, F.; Perreux, D..
Composites will play an essential role in the development of ocean energy conversion systems, and their long term durability is critical to the success of these structures. Composites have been widely used in marine applications and in structures highly loaded in fatigue such as wind turbine blades. However, very few data are available to evaluate their performance under conditions which combine long term immersion in sea water and sustained cyclic loading. In this study composites reinforced with three different types of glass fibre and the same epoxy resin have been tested under these conditions, and the influence of aging on both static and fatigue behaviour has been quantified. Fibre type, resin and fibre/resin interface all influence the fatigue...
Tipo: Text Palavras-chave: Fatigue; Eau de mer; Énergie marine; Hydrolienne; Pale; Fatigue; Sea water; Ocean energy; Tidal turbine; Blade.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00480/59161/61790.pdf
Registros recuperados: 39
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