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| Registros recuperados: 24 | |
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| Kyu-Hyun Park; Ngwa Martin Ngwabie; University of Guelph; Claudia Wagner-Riddle. |
| Composting has the potential to mitigate methane (CH4) and nitrous oxide (N2O) emissions from manure. The heterogeneous nature of emitting surfaces makes it difficult to quantify these emissions. CH4 and N2O fluxes measured using eight small chambers (0.72 m2) and a mega chamber (90 m2) were compared, and the effect of aeration on the fluxes during composting was studied. Two batches of compost were placed in three channels and 2-3 small flux chambers were deployed on each channel. The channels were enclosed by a building serving as a mega chamber. Chamber location significantly affected gas fluxes, pointing to strong spatial heterogeneity. Mean CH4 fluxes from the small chambers were similar or... |
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Palavras-chave: Chamber; Compost; Greenhouse gases; Aeration; Flux. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2467 |
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| Park, Kyu-Hyun; Ngwabie, Ngwa Martin; Wagner-Riddle, Claudia. |
| Composting has the potential to mitigate methane (CH4) and nitrous oxide (N2O) emissions from manure. The heterogeneous nature of emitting surfaces makes it difficult to quantify these emissions. CH4 and N2O fluxes measured using eight small chambers (0.72 m2) and a mega chamber (90 m2) were compared, and the effect of aeration on the fluxes during composting was studied. Two batches of compost were placed in three channels and 2-3 small flux chambers were deployed on each channel. The channels were enclosed by a building serving as a mega chamber. Chamber location significantly affected gas fluxes, pointing to strong spatial heterogeneity. Mean CH4 fluxes from the small chambers were similar or 1.4 times higher compared to the mega chamber. Mean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chamber; Compost; Greenhouse gases; Aeration; Flux. |
| Ano: 2014 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2467 |
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| Treguier, Cathy; Schaeffer, Julien; Le Saux, Jean-claude; Cochennec-laureau, Nathalie; Le Guyader, Soizick. |
| Les norovirus (NoV) sont responsables des épidémies hivernales de gastroentérites aiguës dans la population. Ils sont excrétés dans les fèces humains, puis se retrouvent, après épuration insuffisante, dans le milieu marin naturel où ils peuvent contaminer des coquillages, qui à leur tour risquent de déclencher des gastroentérites chez les consommateurs. Cette étude vise à améliorer les connaissances sur la contamination des coquillages en élevage en rivière d’Auray par les NoV, en lien avec les bactéries témoins de contamination fécale Escherichia coli (E. coli). L’objectif est de suivre les flux de NoV et d’E. coli apportés par différents rejets (dont une station d’épuration) impactant la zone conchylicole et leur influence sur la qualité des coquillages... |
| Tipo: Text |
Palavras-chave: Norovirus; Coquillages; Contamination; Station d’épuration; Flux; Rivière d’Auray; Escherichia coli.. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00267/37778/35829.pdf |
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| Payan, P; Borelli, G; Priouzeau, F; De Pontual, Helene; Boeuf, G; Mayer Gostan, N. |
| Kinetic and pharmacological characteristics of Ca2+ fluxes across the saccular epithelium of trout were studied using a perfused isolated inner ear. Ca-45(2+) influx from the Ringer solution to the endolymph was 3-4 nmoles h(-1) mu(-1) endolymph, which corresponds to a global turnover rate of the endolymph calcium of 200% h(-1). Ca2+ entry into the proximal endolymph was faster than into the distal fluid. Net Ca2+ movement across the saccular epithelium depended on the direction and intensity of the chemical gradient of calcium between the Ringer solution and the endolymph. Increasing the calcium concentration in the Ringer solution up to 4.4 mmol l(-1) provoked an accumulation of Ca2+ in both proximal and distal endolymphs, and equilibrium was reached... |
| Tipo: Text |
Palavras-chave: Inner ear; Perfusion; Otolith; Endolymph; Flux; Calcium; Oncorhynchus mykiss; Trout. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-416.pdf |
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| Le Moine, Olivier; Geairon, Philippe. |
| Le besoin de connaissance (et de partage) sur la quantification et la dynamique des apports (de matières particulaires ou dissous) des fleuves dans les écosystèmes côtiers a motivé ce travail. L'objectif est de mettre au point des méthodes de traitements spécifiques de données acquises par courantométrie Doppler pour évaluer les apports des fleuves, décrire leur dynamique au cours du cycle de marée, et caractériser l'estuaire. Le traitement du signal acquis, en complément d'autres données de bathymétrie et de la salinité permet l'estimation d'indices caractéristiques de l'estuaire du fleuve Charente. Les résultats montrent par exemple que des volumes atteignant 40 à 50 millions de mètres cubes sont déplacés à chaque marée en pic de coefficient. Des... |
| Tipo: Text |
Palavras-chave: Estuaire Charente; Flux; Volume oscillant; Intrusions salines; Temps de résidence. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00120/23096/20943.pdf |
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| Picheral, Marc; Guidi, Lionel; Stemmann, Lars; Karl, David M.; Iddaoud, Ghizlaine; Gorsky, Gabriel. |
| The Underwater Vision Profiler (UVP) was developed to quantify the vertical distribution of macroscopic particles and zooplankton > 100 mu m in size. The smaller size limit is fixed by optical resolution, whereas the larger size limit is determined by the volume of water illuminated per image. The new fifth generation instrument (UVP5) is compact (30 kg in air) and operates either as a stand-alone instrument with an independent power supply for use on a mooring or free-drifting array, or as a component of a Conductivity, Temperature, and Depth (CTD)-rosette package. Images are recorded at a frequency up to 6 Hz. If the UVP5 is interfaced with a CTD, these images are acquired and analyzed in real time. Images are recorded every 20 cm at the 1 m s(-1)... |
| Tipo: Text |
Palavras-chave: Video plankton recorder; Marine snow; MU-M; Vertical distribution; Aggregate dynamics; In situ; System; Ocean; Flux; Phytoplankton. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00133/24413/22426.pdf |
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| Paticat, Francois. |
| The aim of the study is to determine how seawater is used in Ré island marine ponds (Charente-Maritime, France). Thus, we assessed the ecosystem functioning, estimated its historical evolution and determined the most suitable ways to improve current management processes. The knowledge of seawater management is essential to ensure wetland future and meet the numerous interests of wetland stakeholders, especially in term of seawater sharing. Consequently, it is necessary to consider the Ré island marine embanked wetland through its natural as well as human characteristics. Our work followed two research axes. First, a survey and a description of wetland activities were realized through their management types and their water use features, knowing that human... |
| Tipo: Text |
Palavras-chave: Ré Island; Activities; Management; Saltwater; Flows; Coastline; Île de Ré; Activités; Gestion; Eau de mer; Flux; Littoral. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/these-4518.pdf |
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| Breviere, Emilie H. G.; Bakker, Dorothee C. E.; Bange, Hermann W.; Bates, Timothy S.; Bell, Thomas G.; Boyd, Philip W.; Duce, Robert A.; Garcon, Veronique; Johnson, Martin T.; Law, Cliff S.; Marandino, Christa A.; Olsen, Are; Quack, Birgit; Quinn, Patricia K.; Sabine, Christopher L.; Saltzman, Eric S.. |
| The domain of the surface ocean and lower atmosphere is a complex, highly dynamic component of the Earth system. Better understanding of the physics and biogeochemistry of the air-sea interface and the processes that control the exchange of mass and energy across that boundary define the scope of the Surface Ocean-Lower Atmosphere Study (SOLAS) project. The scientific questions driving SOLAS research, as laid out in the SOLAS Science Plan and Implementation Strategy for the period 2004-2014, are highly challenging, inherently multidisciplinary and broad. During that decade, SOLAS has significantly advanced our knowledge. Discoveries related to the physics of exchange, global trace gas budgets and atmospheric chemistry, the CLAW hypothesis (named after its... |
| Tipo: Text |
Palavras-chave: Ocean; Atmosphere; Processes; Biogeochemistry; Flux; Climate. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00293/40405/38964.pdf |
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| Lafite, Robert; Shimwell, Susan; Grochowski, Nicolas; Dupont, Jacques; Nash, Linda; Salomon, Jean-claude; Cabioch, Louis; Collins, Michael; Gao, Shu. |
| Suspended Particulate Matter (SPM) concentrations at various levels within the water column, together with salinity and temperature, were measured using water samples collected from six stations across the Straits of Dover. The sampling programme covered a 16-month period, undertaken during 23 cruises. On the basis of the spatial variability in the concentrations, the water bodies are divided by several boundaries, controlled by tidal and wind conditions. Within the water column, SPM concentrations were higher near the sea bed than in the surface waters. Throughout the cross-section, maximum concentrations occurred adjacent to the coastlines. Temporal variability in the SPM concentration exists on daily and seasonal scales within the coastal waters (4.2 to... |
| Tipo: Text |
Palavras-chave: English Channel; Straits; Transport mechanisms; Flux; Suspended particulate matter; Manche; Détroit; Mécanismes de transport; Flux; Matières en suspension. |
| Ano: 2000 |
URL: https://archimer.ifremer.fr/doc/2000/publication-527.pdf |
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| Le Guyader, Soizick; Pommepuy, Monique; Atmar, Robert. |
| Human and animal fecal wastes and urine contain a large number of different viruses that can enter the environment through the discharge of waste materials from infected individuals. Despite the high diversity of viruses that are introduced into the environment by human fecal pollution, only a few have been recognized to cause disease in association with consumption of contaminated shellfish. Viruses are present in shellfish in very low numbers. Nevertheless, they are present in sufficient quantities to pose a health risk as presented. This low level of contamination has made it necessary to develop highly sensitive viral extraction methods to ensure virus recovery from shellfish tissues. The most common route for accidental contamination is after heavy... |
| Tipo: Text |
Palavras-chave: Human enteric viruses; Shellfish; Sewage; Persistence; Flux. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00015/12606/15279.pdf |
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| Thomson, Jim; Ackley, Stephen; Girard-ardhuin, Fanny; Ardhuin, Fabrice; Babanin, Alex; Boutin, Guillaume; Brozena, John; Cheng, Sukun; Collins, Clarence; Doble, Martin; Fairall, Chris; Guest, Peter; Gebhardt, Claus; Gemmrich, Johannes; Graber, Hans C.; Holt, Benjamin; Lehner, Susanne; Lund, Bjorn; Meylan, Michael H.; Maksym, Ted; Montiel, Fabien; Perrie, Will; Persson, Ola; Rainville, Luc; Rogers, W. Erick; Shen, Hui; Shen, Hayley; Squire, Vernon; Stammerjohn, Sharon; Stopa, Justin; Smith, Madison M.; Sutherland, Peter; Wadhams, Peter. |
| A large collaborative program has studied the coupled air‐ice‐ocean‐wave processes occurring in the Arctic during the autumn ice advance. The program included a field campaign in the western Arctic during the autumn of 2015, with in situ data collection and both aerial and satellite remote sensing. Many of the analyses have focused on using and improving forecast models. Summarizing and synthesizing the results from a series of separate papers, the overall view is of an Arctic shifting to a more seasonal system. The dramatic increase in open water extent and duration in the autumn means that large surface waves and significant surface heat fluxes are now common. When refreezing finally does occur, it is a highly variable process in space and time. Wind and... |
| Tipo: Text |
Palavras-chave: Arctic; Waves; Autumn; Sea ice; Beaufort; Flux. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00437/54837/56313.pdf |
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| Mazouni, Nabila; Deslous-paoli, Jean-marc; Landrein, Sonia. |
| The impact of suspended oyster culture (Crassostrea gigas, Thunberg) on oxygen and nutrient fluxes has been studied in situ, in a coastal lagoon (Thau, France), during a seasonal cycle. On the first plan of the multiple factorial correspondences analysis (MCA), seasons were well discriminated. The fluxes were maximum in summer and minimum in winter. However, this seasonal pattern was not only linked to the water temperature, as autumn and spring (similar temperatures of about 12 degrees C) were distinct in the second factorial plan (2.3). Oxygen uptake by the oyster cultures varied between 0 mu mol m(-2) h(-1) (January) and 11 823 +/- 377 mu mol m(-2) h(-1) (July). Ammonia and nitrate-nitrites were released into the water column respectively at a rate of... |
| Tipo: Text |
Palavras-chave: Oxygen; Nutrients; Fluxes; Oyster culture; Oxygène; Nutriments; Flux; Elevage ostréicole. |
| Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/1998/publication-840.pdf |
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| Le Moine, Olivier; Robert, Serge; Geairon, Philippe; Chabirand, Jean-michel. |
| En réponse aux interrogations et enjeux soulevés par les gestionnaires de l'estuaire de la Charente (EPTB, CG17, AEAG), un projet scientifique partenarial (Ifremer, ULR) a été élaboré pour tenter d'apporter des éléments de réponse souhaités. Les enjeux sont grossièrement de trois ordres : * de gestion, à court et moyen terme, du barrage de Saint Savinien, du Port de Rochefort, de la qualité de l'eau potable. * de connaissances et outils d'aide à la gestion : conditions favorisant l'envasement, continuité écologique, qualité des eaux côtières... * de connaissances scientifiques : bilans hydriques et sédimentaires, impacts des apports dans les pertuis. Les attendus pour cette première phase du projet en 2011 sont surtout la connaissance ou évaluation... |
| Tipo: Text |
Palavras-chave: Estuaire Charente; Flux; MES; Intrusions salines; Saint-Savinien; Département Charente-Maritime. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00142/25312/23387.pdf |
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| Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P. |
| An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and... |
| Tipo: Text |
Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf |
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| Pete, Romain; Malet, Nathalie. |
| Afin d’apporter des éléments de réponse quantitatifs à ces questions, un outil numérique GAMELag a été développé en collaboration avec l’UMR ECOSYM en se basant sur l’approche LOICZ. Par suite ce modèle « simple » (modèle en boîtes avec calcul de bilan de matière aux interfaces) a été affiné au cours de phases successives de validation. La présente étude vise à déployer le modèle écosystémique « GAMELag » permettant d’évaluer les flux et stock d’azote et de phosphore dans la lagune de Biguglia. L’objectif est de i) valider le fonctionnement du modèle sur la lagune de Biguglia et ii) de fournir aux gestionnaires des résultats en réponse à différents scenarios hydroclimatiques (année sèche/pluvieuse) ou selon différentes options de gestion, notamment... |
| Tipo: Text |
Palavras-chave: Modèle écosystémique; GAMELag; Flux; Stock; Azote; Phosphore; Scenarios écologiques. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00604/71565/70025.pdf |
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| Registros recuperados: 24 | |
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