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Evaluation of empirical and semi-analytical chlorophyll algorithms in the Ligurian and North Tyrrhenian Seas ArchiMer
Lapucci, Chiara; Rella, Marina Ampolo; Brandini, Carlo; Ganzin, Nicolas; Gozzini, Bernardo; Maselli, Fabio; Massi, Luca; Nuccio, Caterina; Ortolani, Alberto; Trees, Charles.
The estimation of chlorophyll concentration in marine waters is fundamental for a number of scientific and practical purposes. Standard ocean color algorithms applicable to moderate resolution imaging spectroradiometer (MODIS) imagery, such as OC3M and MedOC3, are known to overestimate chlorophyll concentration ([CHL]) in Mediterranean oligotrophic waters. The performances of these algorithms are currently evaluated together with two relatively new algorithms, OC5 and SAM_LT, which make use of more of the spectral information of MODIS data. This evaluation exercise has been carried out using in situ data collected in the North Tyrrhenian and Ligurian Seas during three recent oceanographic campaigns. The four algorithms perform differently in Case 1 and...
Tipo: Text Palavras-chave: Chlorophyll; Algorithm; Moderate resolution imaging spectroradiometer; Tyrrhenian Sea; Ligurian Sea.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00109/21991/19795.pdf
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Optimisation de la surveillance des masses d’eau DCE en Méditerranée Compléments d’utilisation d’imagerie satellite et application d’outils hydrodynamiques ArchiMer
Ganzin, Nicolas.
This study is a complement to a previous study on the use of spatialised data for the optimisation of the surveillance of coastal waters in the Mediterranean within the European Water Framework Directive (WFD). This fisrt study aimed at characterising the ecological status of the coastal water masses through surface chlorophyll-A concentrations (Chl-A) derived from satellite imagery. The present study is focused on 3 main topics (i) a complementary characterisation of coastal waters with Suspended Particulate Matter (SPM) derived from satellite imagery; (ii) a hydrodynamic characterisation of the coastal waters based on outputs from the MARS-3D hydrodynamic model of Ifremer, by computation of the rate of renewal of the waters in each individual water mass...
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00028/13931/11104.pdf
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Optimisation de la surveillance des masses d’eau DCE en Méditerranée. Utilisation de produits dérivés d’images satellites en complément du réseau de mesures in-situ ArchiMer
Ganzin, Nicolas; Mangin, Antoine.
This study aims at showing the potential of « water colour » data derived from satellite imagery to optimise the monitoring of coastal waters within the WFD, with the French Mediterranean as a study area. The work is focused on one specific parameter, the surface chlorophyll-A (chl-a) concentration of which a monthly atlas for reference to “normal” values is provided, which consists of : (i) the monthly chl-a median computed from satellite data of 2003, 2004 and 2005 ; (ii) the integration in space of these values, represented by their average over the WFD water masses (except those of very small size) ; (iii) an indicator of the spatial variability of the chl-a through the spatial standard deviation within each water mass. Another important result is the...
Tipo: Text Palavras-chave: Chlorophylle; Imagerie satellite; Couleur de l’eau; MERIS; MODIS; Directive Cadre sur l’Eau; DCE; Méditerranée; Chlorophyll; Satellite imagery; Water colour; MERIS; MODIS; Water Frame Directive; WFD; Mediterranean.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00398/50906/51677.pdf
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Vérification des conditions de référence des eaux côtières de Corse. Utilisation de la plate-forme de modélisation ArchiMer
Ganzin, Nicolas; Fiandrino, Annie.
This report comes within convention #2007 1742 between the Water Agency for Rhône, the Mediterranean and Corsica (AERM&C) and Ifremer, with the title “Verification of the reference conditions for coastal water in Corsica – Use of the modelling platform”. It consisted of an application for Corsica of the development implemented by Ifremer within the Mediterranean coastal modelling platform. This implements the MARS-3D hydrodynamic model of Ifremer on the Mediterranean which allows to simulate currents, height of water column, salinity and temperature. The model is operational and provides data accessible to the public on the MENOR zone (North west Mediterranean) with a 1,2 km resolution. These data were utilised to provide a hydrodynamic...
Tipo: Text Palavras-chave: Modélisation hydrodynamique MARS-3D DCE Masses d'eau Taux de renouvellement Temps de renouvellement Hydrodynamic Modelling MARS-3D; Water Frame Directive Water Masses Renewal Rate Renewal Time.
Ano: 2009 URL: https://archimer.ifremer.fr/doc/00480/59195/61884.pdf
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