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| Registros recuperados: 38 | |
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| Baudrier, Jerome; Colas, Sebastien; Garreau, Pierre. |
| L’objectif de cette fiche est de présenter la variabilité de la température et de la salinité sur les différentes façades métropolitaines. Les principaux processus hydrologiques induits par ces deux paramètres sont détaillés pour fournir un aperçu de leur influence au sein des écosystèmes concernés. Synthèse nationale rédigée à partir des contributions thématiques de l'évaluation initiale de la DCSMM [Garreau Pierre, 2012. Variation spatio-temporelle de la température et de la salinité, sous-région marine Méditerranée occidentale / Vandermeirsch Fédéric, 2012. Variation spatio-temporelle de la température et de la salinité, sous-régions marines Manche - mer du Nord ; mers Celtiques ;... |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00365/47659/47696.pdf |
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| Raynaud, Stephane; Charria, Guillaume; Wilkins, Jonathan; Garnier, Valerie; Garreau, Pierre; Theetten, Sebastien. |
| VACUMM is an open-source Python library for processing data from observations and numerical models. The library is now used for several years in research and operational contexts, for instance for producing fi gures and reports, validating models, converting data, or making simple or advanced diagnostics. In this paper, we introduce how the library is built, and we present two applications of its use: one in an operational context and one in a research context. |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00197/30784/29142.pdf |
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| Garreau, Pierre. |
| Le talus continental est une zone charnière pour la dynamique des masses d'eau. Du point de vue des ondes fluides, il peut -être soit un obstacles sur lequel elles se réflechissent partiellement comme la marée, soit un guide comme pour les ondes de Rossby topographiques. Dans ce mémoire est abordé le passage de la marée au dessus d'un talus rectiligne uniforme dans une approche linéaire puis non linéaire. La création d'un courant le long d'un talus idéalisé de marée par les effets non lineaires est ensuite discuté. Dans cette approche, le courant résiduel eulérien, n'est pas accompagné par un transport lagrangien de masse d'eau le long du talus. |
| Tipo: Text |
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| Ano: 1991 |
URL: https://archimer.ifremer.fr/doc/00591/70316/68351.pdf |
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| Umgiesser, G; Garreau, Pierre; Arcilla, As; Clementi, E; Salon, S; Ravdas, M; Federico, I; Zodiatis, G; Ferrarin, C; Verri, G; Cossarini, G; Sotillo, Mg; Cucco, A; Sorgente, R; Mourre, B; Vilibic, I; Sammartino, S; Coppini, G; Fanjul, Ea. |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00450/56155/57697.pdf |
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| Karoui, Imen; Chauris, Hervé; Garreau, Pierre; Craneguy, Philippe. |
| We propose a multi resolution method for automatic detection of eddies on both simulated and satellite Sea Surface Temperature (SST) or ocean color images. Our approach consists in a curvelet based analysis of image fronts along circles with specified radius values. The main interests of the proposed method are: It is carried out on image gradient, and is thus not sensitive to the choice of binarization threshold; With the multi-resolution aspect and the anisotropic spatial support shape of curvelet elements, we can deal with no perfectly circular eddies (curvelet width) and we also take into account the image regularity to distinguish between real eddies and noise (curvelet length). We have tested the method on several modeled and satellite images in the... |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00068/17888/15422.pdf |
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| Dussurget, Renaud; Pairaud, Ivane; Dufau, Claire; Charria, Guillaume; Garreau, Pierre; Garnier, Valerie. |
| In this preliminary study, we investigate the characteristics of a standard regional NRT product & an experimental L3 coastal sea-level product from PISTACH data, and assess their combined use with in-situ data (drifters) and a regional model. The results suggest that: •J2 NRT data shows some consistent behaviour with drifter data, despite biases •RED3 retracking : better coastal coverage (>5%) •NORMED model has an excess of energy at the mesoscales, possibly arising from the lack of energy dissipation towards the finer scales |
| Tipo: Text |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00410/52143/52860.pdf |
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| Garreau, Pierre; Dumas, Franck; Louazel, Stephanie; Correard, Stephanie. |
| The Mediterranean Sea is often referred as a “pocket ocean” exhibiting many processes that are primary interest the global ocean circulation given the opportunity to investigate a large panel of oceanic features in a relatively restrained area. Recent field experiments based on the multi-plateform integrated monitoring MOOSE or on intensive targeted experiment HYMEX revisited the hydrology and the dynamics of the Western Basin. Such approaches emphasized the ubiquity of the fine scale dynamics in the Mediterranean dynamics. An overview of the observed processes during 5 recent fields experiments are presented and discussed regarding meso- and submeso-scale processes. |
| Tipo: Text |
Palavras-chave: Mesoscale phenomena; Western Mediterranean; Fronts. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00582/69398/67247.pdf |
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| Dufois, Francois; Garreau, Pierre; Le Hir, Pierre; Forget, P. |
| Simulations of both currents and waves were performed throughout the year 2001 to assess the relative contribution of each to their overall erosive potential on the Gulf of Lions shelf. Statistical analysis of bottom shear stress (BSS) was compared to sediment grain-size distribution on the bottom. The hydrodynamic features of the bottom layer coincide with the distribution of surficial sediments, and three areas with different hydro-sedimentary characteristics were revealed. (i) The sandy inner shelf ( < 30 m) area is a high-energy-wave dominated area but may be subjected to intense current-induced BSS during on-shore winds along the coast and during continental winds mainly in the up-welling cells. (ii) The middle shelf (30-100 m) is a low-energy... |
| Tipo: Text |
Palavras-chave: Gulf of Lions; 3D modelling; Bottom shear stress; Sediment transport. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-6305.pdf |
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| Garrabou, Joachim; Bensoussan, Nathaniel; Pairaud, Ivane; Garreau, Pierre; Somot, Samuel; Linares, Cristina; Kersting, Diego K.; Cebrian, Emma; De Caralt, Sonia; Kipson, Silvija; Ledoux, Jean-baptiste; Frleta-valic, Masa. |
| The Mediterranean is considered a biodiversity hot‐spot. The Mediterranean represents less than 1% of global ocean surface, but it hosts about 20% of marine biodiversity with a high level of endemic species. The Mediterranean is also considered a hot‐spot for climate change with expected warming over the average along with a very likely increase in the occurrence of heat waves in climate change. In fact Mediterranean waters have been already significantly warming up during the last decades, and this trend is expected to increase during the rest of the 21st century. Mediterranean marine ecosystems are already displaying clear responses to warming such as pelagic productivity, shifts in species’ geographical distributions, modifications of migratory patterns... |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00164/27558/25724.pdf |
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| Gailhard-rocher, Isabelle; Huret, Martin; Lazure, Pascal; Vandermeirsch, Frederic; Gatti, Julie; Garreau, Pierre; Gohin, Francis. |
| Dans le contexte de l’évaluation initiale des eaux communautaires demandée par la Directive cadre stratégie pour le milieu marin (DCSMM), les états membres sont chargés de décrire les types d’habitats dominants de la colonne d’eau pour chaque sous-région marine. La présente étude s’inscrit dans ce contexte et a pour objectif de décrire les principales structures hydrologiques de la colonne d’eau. Sur la base des données existantes et des travaux antérieurs, il s’agit de classer les masses d'eau en fonction de critères physiques (température, salinité, turbidité, stratification), reconnus d’intérêt pour les espèces pélagiques et l’écosystème en général, et ainsi de définir une cartographie de l’habitat pélagique moyen. Les données utilisées correspondent... |
| Tipo: Text |
Palavras-chave: DCSMM; Habitat pélagique; Classification; Indices hydrologiques; Distribution des espèces; KeywordsMSFD; Pelagic Habitat; Clustering; Hydrological indices; Species distribution. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00069/18018/15547.pdf |
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| Alekseenko, Elena; Thouvenin, Benedicte; Tronczynski, Jacek; Carlotti, F.; Garreau, Pierre; Tixier, Celine; Baklouti, Melika. |
| 3D coupled modeling approach is used for the PCB dispersion assessment in the Gulf of Lion and its transfer to zooplankton via biogeochemical processes. PCB budgets and fluxes between the different species of PCB: dissolved, particulate, biosorbed on plankton, assimilated by zooplankton, which are governed by different processes: adsorption/desorption, bacteria and plankton mortality, zooplankton excretion, grazing, mineralization, volatilization have been estimated. Model outputs were compared with the available in situ data. It was found that the Rhone River outflows play an important role in the organism contamination in the coastal zone, whereas the atmospheric depositions are rather more important in the offshore zones. The transfer of the available... |
| Tipo: Text |
Palavras-chave: PCBs; 3D coupled model; Gulf of Lions; Planktonic food web; CB153 fluxes. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00440/55177/56654.pdf |
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| Registros recuperados: 38 | |
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