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| Registros recuperados: 38 | |
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| Pairaud, Ivane; Garreau, Pierre; Le Berre, David; Fernandez, Delphine; Bellomo, Lucio; Garnier, Valerie. |
| The Northern Current (NC) is a branch of the general North-Western Mediterranean cyclonic circulation extending from the Ligurian to the Catalan Sea (Millot, Dynamics of Atmospheres and Oceans, vol. 15, 1991). In winter and early spring, instabilities of this slope current are intense and can generate eddies, meanders and filaments. The study of mesoscale structures is crucial in the coastal area because of their physical and biogeochemical impact on ecosystems. They play a role in water, chemicals and nutrients transport, vertical mixing and possible trapping of biological materials. Results from a combined observational effort put forth in March 2012 during the IMEDIA cruise dedicated to eddy tracking are presented. This work aims at providing... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00410/52142/52859.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. |
| Tipo: Text |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00197/30784/29142.pdf |
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| Garreau, Pierre; Dumas, Franck; Louazel, Stephanie; Stegner, A.; Le Vu, B.. |
| Mesoscale dynamics in the Mediterranean Sea have been investigated for years and anticyclonic eddies are regularly observed features in the Algerian Basin. Here, we used the AMEDA eddy detection algorithm to track and monitor a particular anticyclonic eddy from its birth to its death. The analysis of remote‐sensing datasets (AVISO and SST) revealed that this anticyclone split from an Algerian eddy in October 2015, interacted with the North Balearic Front and merged seven months later, in May 2016, with a similar Algerian eddy. In early spring 2016, a field experiment during the ProtevsMed 2016 cruise thoroughly investigated this eddy, when it was located near the North Balearic Front, taking high‐resolution (Seasoar) hydrological transects, several CTD... |
| Tipo: Text |
Palavras-chave: Western Mediterranean Sea; North Balearic Front; Anticyclonic eddy; Submesoscale observations; Eddy tracking tool; High-resolution sampling. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00469/58068/60466.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 |
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| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00410/52143/52860.pdf |
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| Herbert, Gaelle; Garreau, Pierre; Garnier, Valerie; Dumas, Franck; Caillaud, S.; Chanut, Jerome; Levier, Bruno; Aznar, Roland. |
| In order to favour the downstream from the European MyOcean service of large scale ocean forecasts to the national service of coastal ocean forecasts, studies of new methods improving the downscaling between global or regional ocean models and coastal ones are in progress. In the framework of PREVIMER and MyOcean projects respectively, IFREMER and Mercator Ocean studied in parallel the impact of the spectral nudging method. In the present work, the performance of spectral nudging was assessed using two regional hydrodynamic models: one of Mediterranean Sea and one of the Iberia-Biscay-Ireland (IBI) area. They are both forced by a coarser global circulation model (GCM) (PSY2V4/Mercator Ocean). This technique prevents large and unrealistic departures between... |
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| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00197/30794/29162.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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| 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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| 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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| 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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| Laguionie, Philippe; Bailly-du-bois, Pascal; Boust, D.; Fievet, B.; Garreau, Pierre; Connan, O.; Charmasson, Sabine; Arnaud, M.; Duffa, Celine; Champion, D.. |
| The accident at the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in March 2011 led to an unprecedented direct input of artificial radioactivity into the marine environment. The Institute for Radioprotection and Nuclear Safety was requested by the French authorities to investigate the radioecological impact of this input, in particular the potential contamination of products of marine origin used for human consumption. This article describes the close link between the responses provided and the availability of the data, as well as their nature and ability to meet the requirements of expert investigation. These responses were needed: (i) to evaluate the inputs of radionuclides into the marine environment, (ii) to understand their dispersion in seawater,... |
| Tipo: Text |
Palavras-chave: Nuclear power plant; Accident analysis; Seawater; Sediment; Biota. |
| Ano: 2012 |
URL: http://archimer.ifremer.fr/doc/00096/20690/18353.pdf |
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| Registros recuperados: 38 | |
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