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| Registros recuperados: 374 | |
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| Lazure, Pascal; Jegou, Anne-marie; Kerdreux, Michel. |
| The Bay of Biscay is characterised by large fresh water inputs from two major rivers, the Loire and the Gironde, with a mean discharge of about 900 m(3)/s. To describe the spatial and temporal variability of the Loire and Gironde plumes, continuous salinity measurements were made at 4 locations on French coastal islands over periods lasting at least two years. These islands are located at a distance from the large local gradients linked to local inputs. Whereas sea surface salinity in the centre of the Bay of Biscay is 35.6, salinities at the coast vary between about 35 in summer to occasionally less than 30 in late winter or in spring. Minimum salinities do not occur at the same time along the coast, indicating a strong spatial gradient. Near the Loire... |
| Tipo: Text |
Palavras-chave: Bay of Biscay; Continental shelf; River plume; Seasonal variability; Salinity; Hydrology. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-3957.pdf |
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| Lemaire, Pierrette; Bernard, Eric; Martinez-paz, J; Chim, Liet. |
| In New Caledonia, the "syndrome 93," which results in mass mortalities of farmed shrimp Penaeus stylirostris, occurs during the transitional and the cold seasons. The transitional season is characterized by an important fall in the average water temperature from 28 to 19 degreesC in 2 weeks. Besides this marked temperature fall, there are also nyctemeral temperature changes of up to 7 degreesC in 12 h. The cold season is characterized by an average water temperature of 19 degreesC with extreme lows of 14 degreesC. The objective of this study was to determine the effect of temperature and its variations on the osmoregulatory capacity of juvenile (7-10 g average weight) and subadult (25 g average weight) shrimps subjected to conditions of different salinity.... |
| Tipo: Text |
Palavras-chave: Temperature; Salinity; Osmoregulatory capacity; Penaeus stylirostris; Shrimp. |
| Ano: 2002 |
URL: http://archimer.ifremer.fr/doc/2002/publication-395.pdf |
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| Amiraux, Rémi; Burot, Christopher; Bonin, Patricia; Massé, Guillaume; Guasco, Sophie; Babin, Marcel; Vaultier, Frédéric; Rontani, Jean-françois. |
| During sea-ice melt in the Arctic, primary production by sympagic (sea-ice) algae can be exported efficiently to the seabed if sinking rates are rapid and activities of associated heterotrophic bacteria are limited. Salinity stress due to melting ice has been suggested to account for such low bacterial activity. We further tested this hypothesis by analyzing samples of sea ice and sinking particles collected from May 18 to June 29, 2016, in western Baffin Bay as part of the Green Edge project. We applied a method not previously used in polar regions—quantitative PCR coupled to the propidium monoazide DNA-binding method—to evaluate the viability of bacteria associated with sympagic and sinking algae. We also measured cis-trans isomerase activity, known to... |
| Tipo: Text |
Palavras-chave: Bacteria; Sea ice; Sympagic algae; Ice biota; Viability; Stress factors; Salinity; Bactericidal free fatty acids; Carbon export. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00681/79329/81840.pdf |
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| Barrut, Bertrand; Blancheton, Jean-paul; Champagne, Jean-yves; Grasmick, Alain. |
| A study was undertaken to measure the water flow (Qw) delivered by a vacuum airlift designed for recirculating aquaculture systems (RAS) in fresh (<1‰ of salinity) and sea water (35‰ of salinity). The vacuum airlift consists of two concentric tubes connected at their top to a depression chamber. The water rises in the inner tube as a result of air being injected in its lower section and flows back through the external downcomer tube. The vacuum airlift was adjusted at three different lengths: 2, 4 or 6 m and water discharge could be lifted from 0 to 30 cm. Air flow rate (Qg) varied from 0 to 80 L min−1. Different types of air injectors were tested, delivering different bubble sizes (0.1–5 mm) depending on porosity and functioning at low or high... |
| Tipo: Text |
Palavras-chave: Water circulation; Airlift; Vacuum; Aquaculture; RAS; Salinity. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00073/18457/16005.pdf |
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| Schmidt, Matthew W.; Spero, Howard J.. |
| Paleoproxy studies show a strong correlation between tropical climate and high-latitude temperature variability recorded in the Greenland ice cores over the last glacial cycle. In particular, abrupt cooling events in the Greenland Ice Sheet Project II delta(18)O ice record appear synchronous with a southward migration of the Intertropical Convergence Zone (ITCZ) in the Atlantic, a weakening of the Indian and East Asian monsoon systems, and a strengthening of the South American monsoon system. Because this high-to-low-latitude climate teleconnection significantly alters the tropical hydrologic cycle around the globe, it plays a critical role in regulating global climate on glacial-interglacial time scales. We compare delta(18)O(seawater) reconstructions (a... |
| Tipo: Text |
Palavras-chave: Hydrologic cycle; Mg/Ca; Quaternary; Tropics; Salinity; ITCZ. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00228/33877/32255.pdf |
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| Roemmich, Dean; Alford, Matthew H.; Claustre, Hervé; Johnson, Kenneth; King, Brian; Moum, James; Oke, Peter; Owens, W. Brechner; Pouliquen, Sylvie; Purkey, Sarah; Scanderbeg, Megan; Suga, Toshio; Wijffels, Susan; Zilberman, Nathalie; Bakker, Dorothee; Baringer, Molly; Belbeoch, Mathieu; Bittig, Henry C.; Boss, Emmanuel; Calil, Paulo; Carse, Fiona; Carval, Thierry; Chai, Fei; Conchubhair, Diarmuid Ó.; D’ortenzio, Fabrizio; Dall’olmo, Giorgio; Desbruyeres, Damien; Fennel, Katja; Fer, Ilker; Ferrari, Raffaele; Forget, Gael; Freeland, Howard; Fujiki, Tetsuichi; Gehlen, Marion; Greenan, Blair; Hallberg, Robert; Hibiya, Toshiyuki; Hosoda, Shigeki; Jayne, Steven; Jochum, Markus; Johnson, Gregory C.; Kang, Kiryong; Kolodziejczyk, Nicolas; Körtzinger, Arne; Traon, Pierre-yves Le; Lenn, Yueng-djern; Maze, Guillaume; Mork, Kjell Arne; Morris, Tamaryn; Nagai, Takeyoshi; Nash, Jonathan; Garabato, Alberto Naveira; Olsen, Are; Pattabhi, Rama Rao; Prakash, Satya; Riser, Stephen; Schmechtig, Catherine; Schmid, Claudia; Shroyer, Emily; Sterl, Andreas; Sutton, Philip; Talley, Lynne; Tanhua, Toste; Thierry, Virginie; Thomalla, Sandy; Toole, John; Troisi, Ariel; Trull, Thomas W.; Turton, Jon; Velez-belchi, Pedro Joaquin; Walczowski, Waldemar; Wang, Haili; Wanninkhof, Rik; Waterhouse, Amy F.; Waterman, Stephanie; Watson, Andrew; Wilson, Cara; Wong, Annie P. S.; Xu, Jianping; Yasuda, Ichiro. |
| The Argo Program has been implemented and sustained for almost two decades, as a global array of about 4000 profiling floats. Argo provides continuous observations of ocean temperature and salinity versus pressure, from the sea surface to 2000 dbar. The successful installation of the Argo array and its innovative data management system arose opportunistically from the combination of great scientific need and technological innovation. Through the data system, Argo provides fundamental physical observations with broad societally-valuable applications, built on the cost-efficient and robust technologies of autonomous profiling floats. Following recent advances in platform and sensor technologies, even greater opportunity exists now than 20 years ago to (i)... |
| Tipo: Text |
Palavras-chave: Argo; Floats; Global; Ocean; Warming; Circulation; Temperature; Salinity. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00509/62043/66192.pdf |
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| Camara, I.; Kolodziejczyk, Nicolas; Mignot, Juliette; Lazar, Alban; Gaye, Amadou T.. |
| The physical processes controlling the mixed layer salinity (MLS) seasonal budget in the tropical Atlantic Ocean are investigated using a regional configuration of an ocean general circulation model. The analysis reveals that the MLS cycle is generally weak in comparison of individual physical processes entering in the budget because of strong compensation. In evaporative regions, around the surface salinity maxima, the ocean acts to freshen the mixed layer against the action of evaporation. Poleward of the southern SSS maxima, the freshening is ensured by geostrophic advection, the vertical salinity diffusion and, during winter, a dominant contribution of the convective entrainment. On the equatorward flanks of the SSS maxima, Ekman transport mainly... |
| Tipo: Text |
Palavras-chave: Salinity; Seasonal variation; Tropical Atlantic; Vertical mixing. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00624/73563/73200.pdf |
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| Nezlin, Nikolay P.; Dever, Mathieu; Halverson, Mark; Leconte, Jean-michel; Maze, Guillaume; Richards, Clark; Shkvorets, Igor; Zhang, Rui; Johnson, Greg. |
| This study demonstrates the long-term stability of salinity measurements from Argo floats equipped with inductive conductivity cells, which have extended float lifetimes as compared to electrode-type cells. New Argo float sensor payloads must meet the demands of the Argo governance committees before they are implemented globally. Currently, the use of CTDs with inductive cells designed and manufactured by RBR Ltd., has been approved as a Global Argo Pilot. One requirement for new sensors is to demonstrate stable measurements over the lifetime of a float. To demonstrate this, data from four Argo floats in the western Pacific Ocean equipped with the RBRargo CTD sensor package are analyzed using the same Owens-Wong-Cabanes (OWC) method and reference datasets... |
| Tipo: Text |
Palavras-chave: Pacific Ocean; Salinity; Instrumentation/sensors; Profilers; Oceanic; Quality assurance/control. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00654/76568/77698.pdf |
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| Yin, Xiaobin; Boutin, Jacqueline; Martin, Nicolas; Spurgeon, Paul; Vergely, Jean-luc; Gaillard, Fabienne. |
| The wind speed (WS) provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) is used to initialize the retrieval process of WS and Sea Surface Salinity (SSS) obtained by the Soil Moisture and Ocean Salinity (SMOS) mission. This process compensates for the lack of onboard instrument providing a measure of ocean surface WS independent of the L-band radiometer measurements. The SMOS-retrieved WS in the center of the swath (± 300 km) is adjusted regarding to its a priori estimate. The quality of the SMOS-retrieved SSS (SSSSMOS) is better at the center of the swath than at the edge of the swatch because the larger number of brightness temperature measurements available at the center of the swath reduces the effects of noise and because the... |
| Tipo: Text |
Palavras-chave: SMOS; SSMIS; ECMWF; Wind speed; Salinity. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00158/26970/25261.pdf |
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| Swadling, Kerrie M.; Penot, Florian; Vallet, Carole; Rouyer, Armelle; Gasparini, Stephane; Mousseau, Laure; Smith, Martina; Goffart, Anne; Koubbi, Philippe. |
| Spatial and temporal variability of zooplankton was studied during five summers (2004-2008) in the Dumont d'Urville Sea, east Antarctica. The species recorded, based on the catch of a 500 mm-mesh Bongo net, were typical of southern continental shelf communities in Antarctica, including Euphausia crystallorophias, polychaetes, pteropods and biomass-dominant copepods. There was a strong degree of temporal variation in abundance, possibly related to the thickness and extent of the sea ice cover during each spring prior to the surveys. Total mean abundance was highly variable between years, with a minimum of 961 ind. 1000m(-3) in 2004 (range 65-3407 ind. 1000 m(-3)) and a maximum of 15,627 ind. 1000 m(-3) in 2005 (range 5109-33,869 ind. 1000 m(-3)). Spatially,... |
| Tipo: Text |
Palavras-chave: Salinity; Temperature; Sea ice; Zooplankton-environment relationships; Mertz glacier. |
| Ano: 2011 |
URL: https://archimer.ifremer.fr/doc/00230/34123/32600.pdf |
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| Durieux, Eric; Farver, Thomas B.; Fitzgerald, Patrick S.; Eder, Kai J.; Ostrach, David J.. |
| Acetylcholinesterase (AChE) activity is one of the most common biomarkers of neurotoxicity used in aquatic organisms. However, compared to its extensive use as biomarker, the effects of natural factors onAChE activity remain unclear especially in estuarine fishes. The aim of this study was to evaluate the effects of natural factors on AChE activity of striped bass (Morone saxatilis) juveniles. Brain AChE activity was measured in YOY (Young-Of-Year) individuals collected monthly from August 2007 to January 2008 at 12 different sites in the San Francisco Estuary system. The spatio-temporal variability of AChE was analyzed relative to water temperature and salinity as well as fish size. AChE activity was highly positively correlated with water temperature and... |
| Tipo: Text |
Palavras-chave: Fish; Biomarker; Acetylcholinesterase; Brain; Temperature; Salinity; Size. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00008/11939/8642.pdf |
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| Abadie, Eric; Muguet, Alexia; Berteaux, Tom; Chomerat, Nicolas; Hess, Philipp; Roque D'Orbcastel, Emmanuelle; Masseret, Estelle; Laabir, Mohamed. |
| Vulcanodinium rugosum, a recently described species, produces pinnatoxins. The IFR-VRU-01 strain, isolated from a French Mediterranean lagoon in 2010 and identified as the causative dinoflagellate contaminating mussels in the Ingril Lagoon (French Mediterranean) with pinnatoxin-G, was grown in an enriched natural seawater medium. We tested the effect of temperature and salinity on growth, pinnatoxin-G production and chlorophyll a levels of this dinoflagellate. These factors were tested in combinations of five temperatures (15, 20, 25, 30 and 35 °C) and five salinities (20, 25, 30, 35 and 40) at an irradiance of 100 µmol photon m−2 s−1. V. rugosum can grow at temperatures and salinities ranging from 20 °C to 30 °C and 20 to 40, respectively. The optimal... |
| Tipo: Text |
Palavras-chave: Vulcanodinium rugosum; Mediterranean Ingril Lagoon; Toxin production; Growth conditions; Temperature; Salinity. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00333/44429/44095.pdf |
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| Arzul, Isabelle; Bond, Celine; Gagnaire, Beatrice; Morga, Benjamin; Chollet, Bruno; Ferrand, Sylvie; Robert, Maeva; Renault, Tristan. |
| Bonamiosis due to the intrahaemocytic protistan parasite Bonamia ostreae is a European endemic disease affecting the flat oyster, Ostrea edulis. After its first description in June 1979ı in Brittany, the parasite rapidly spread to all French oyster farming areas and in other European countries through transfers of live molluscs. The parasite has been described in different ecosystems from estuaries to open sea and no clear correlations could he demonstrated between the disease development and environmental parameters like temperature or salinity. The infection can he directly transmitted by cohabitation between infected and non infected oysters. Nevertheless, the parasite life cycle, including its survival outside the host, is not completely... |
| Tipo: Text |
Palavras-chave: Impact; Salinity; Temperature; Flow cytometry; Bonamia ostreae; Parasite; Ostrea edulis; Oyster. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/acte-3372.pdf |
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| Maes, Christophe; Reul, Nicolas; Behringer, David; O'Kane, Terence. |
| The space-borne measurements of the SMOS mission reveal for the first time the complete features of the sea surface salinity (SSS) signature at the full scale of the Pacific basin. The SSS field in the equatorial cold tongue is typically found to be larger than 35.1 within a narrow 2° band of latitude that is positioned slightly south of the equator and that stretches across the eastern Pacific basin up to the Galapagos Islands. On the northern edge of the eastern equatorial Pacific this signature results in a very strong horizontal gradient (larger than 2 units over 100 km) with the fresh waters of the Panama warm pool. By considering a water density criterion, it can be shown that the cold tongue is characterized by a strong seasonal cycle with a 3°C... |
| Tipo: Text |
Palavras-chave: Physical oceanography; Cold tongue; Salinity; Remote sensing data; Pacific ocean. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00245/35577/34109.pdf |
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| Registros recuperados: 374 | |
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