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Registros recuperados: 6
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Biogeography of tuna and billfish communities ArchiMer
Reygondeau, Gabriel; Maury, Olivier; Beaugrand, Gregory; Fromentin, Jean-marc; Fonteneau, Alain; Cury, Philippe.
Aim The aims of this study were: (1) to identify global communities of tuna and billfish species through quantitative statistical analyses of global fisheries data; (2) to describe the spatial distribution, main environmental drivers and species composition of each community detected; and (3) to determine whether the spatial distribution of each community could be linked to the environmental conditions that affect lower trophic levels by comparing the partitions identified in this study with Longhursts biogeochemical provinces. Location The global ocean from 60 degrees S to 65 degrees N. Methods We implemented a new numerical procedure based on a hierarchical clustering method and a nonparametric probabilistic test to divide the oceanic biosphere into...
Tipo: Text Palavras-chave: Biogeochemical provinces; Global ocean; Istiophorus; Katsuwonus; Macroecology; Makaira; Marine biogeography; Tetrapturus; Thunnus; Xiphias.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00060/17141/14716.pdf
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Estimates of Water-Column Nutrient Concentrations and Carbonate System Parameters in the Global Ocean: A Novel Approach Based on Neural Networks ArchiMer
Sauzede, Raphaelle; Claustre, Hervé; Bittig, Henry; Pasqueron De Fommervault, Orens; Gattuso, Jean-pierre; Legendre, Louis; Johnson, Kenneth S.
A neural network-based method (CANYON: CArbonate system and Nutrients concentration from hYdrological properties and Oxygen using a Neural-network) was developed to estimate water-column biogeochemically relevant variables in the Global Ocean. These are the concentrations of 3 nutrients [nitrate (NO3−), phosphate (PO43−) and silicate (Si(OH)4)] and 4 carbonate system parameters [total alkalinity (AT), dissolved inorganic carbon (CT), pH (pHT) and partial pressure of CO2 (pCO2)], which are estimated from concurrent in situ measurements of temperature, salinity, hydrostatic pressure and oxygen (O2) together with sampling latitude, longitude and date. Seven neural-networks were developed using the GLODAPv2 database, which is largely representative of the...
Tipo: Text Palavras-chave: Neural network; Nutrients; Carbonate system; Global ocean; GLODAPv2 database; Profiling floats.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00383/49467/49952.pdf
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Genomic ecology of Marine Group II, the most common marine planktonic Archaea across the surface ocean ArchiMer
Pereira, Olivier; Hochart, Corentin; Auguet, Jean-christophe; Debroas, Didier; Galand, Pierre E..
Planktonic Archaea have been detected in all the world's oceans and are found from surface waters to the deep sea. The two most common Archaea phyla are Thaumarchaeota and Euryarchaeota. Euryarchaeota are generally more common in surface waters, but very little is known about their ecology and their potential metabolisms. In this study, we explore the genomic ecology of the Marine Group II (MGII), the main marine planktonic Euryarchaeota, and test if it is composed of different ecologically relevant units. We re‐analyzed Tara Oceans metagenomes from the photic layer and the deep ocean by annotating sequences against a custom MGII database and by mapping gene co‐occurrences. Our data provide a global view of the distribution of Euryarchaeota, and more...
Tipo: Text Palavras-chave: 16S rRNA; Euryarchaeota; Global ocean; Metagenomics; Poseidoniales; Proteorhodopsin.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00505/61676/65607.pdf
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Impact of partial steps and momentum advection schemes in a global ocean circulation model at eddy-permitting resolution ArchiMer
Barnier, B; Madec, G; Penduff, T; Molines, J; Treguier, Anne-marie; Le Sommer, J; Beckmann, A; Biastoch, A; Boning, C; Dengg, J; Derval, C; Durand, E; Gulev, S; Remy, E; Talandier, Claude; Theetten, Sebastien; Maltrud, M; Mcclean, J; De Cuevas, B.
Series of sensitivity tests were performed with a z-coordinate, global eddy-permitting (1/4 degrees) ocean/sea-ice model (the ORCA-R025 model configuration developed for the DRAKKAR project) to carefully evaluate the impact of recent state-of-the-art numerical schemes on model solutions. The combination of an energy-enstrophy conserving (EEN) scheme for momentum advection with a partial step (PS) representation of the bottom topography yields significant improvements in the mean circulation. Well known biases in the representation of western boundary currents, such as in the Atlantic the detachment of the Gulf Stream, the path of the North Atlantic Current, the location of the Confluence, and the strength of the Zapiola Eddy in the south Atlantic, are...
Tipo: Text Palavras-chave: Eddy/topography interactions; Partial step topography; Momentum advection scheme; Eddy permitting ocean model; Global ocean.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3514.pdf
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Improved description of the ocean mesoscale variability by combining four satellite altimeters - art. no. L02611 ArchiMer
Pascual, Ananda; Faugere, Yannice; Larnicol, Gilles; Le Traon, Pierre-yves.
Data from four satellite altimeters are combined with the aim of improving the representation of the mesoscale variability in the Global Ocean. All missions [Jason-1, ERS-2/ENVISAT, Topex/Poseidon interleaved with Jason-1 and Geosat Follow-On] are cross-calibrated previously to produce weekly gridded maps. In areas of intense variability, the rms differences between a classical configuration of two altimeters and the scenario merging four missions can reach 10 cm and 400 cm(2)/s(2) in SLA and EKE, respectively, which represents an important percentage of the signal variance. A comparison with surface drifters shows that the four altimeter scenario improves the recovery of mesoscale structures that were not properly sampled with Jason(-1) + ERS-2/ENVISAT....
Tipo: Text Palavras-chave: Satellite altimeters; Mesoscale variability; Global ocean.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1038.pdf
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Subtropical Mode Waters and Permanent Pycnocline properties in the World Ocean ArchiMer
Feucher, Charlene; Maze, Guillaume; Mercier, Herle.
A global reference state of the subtropical mode waters and permanent pycnoclines properties for the 2000‐2015 period is presented. The climatology is obtained from a pattern recognition algorithm applied to stratification profiles from the Argo global array. The stratification features are identified as permanent upper ocean pycnostad and pycnocline even when the seasonal pycnocline is developed. The climatology shows that both Northern Hemisphere subtropical gyres have a qualitatively very similar stratification structure. The permanent pycnocline in the North Atlantic and North Pacific show two deep centers colocated with thick subtropical and subpolar mode waters. These centers coincide with modes in the density and stratification space. These deep...
Tipo: Text Palavras-chave: Subtropical gyre; Pycnocline; Argo; Global ocean; Stratification.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00480/59176/61817.pdf
Registros recuperados: 6
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