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| Barbieux, Marie; Uitz, Julia; Bricaud, Annick; Organelli, Emanuele; Poteau, Antoine; Schmechtig, Catherine; Gentili, Bernard; Obolensky, Grigor; Leymarie, Edouard; Penkerc'H, Christophe; D'Ortenzio, Fabrizio; Claustre, Herve. |
| Characterizing phytoplankton distribution and dynamics in the world's open oceans requires in situ observations over a broad range of space and time scales. In addition to temperature/salinity measurements, Biogeochemical-Argo (BGC-Argo) profiling floats are capable of autonomously observing at high-frequency bio-optical properties such as the chlorophyll fluorescence, a proxy of the chlorophyll a concentration (Chla), the particulate backscattering coefficient (b(bp)), a proxy of the stock of particulate organic carbon, and the light available for photosynthesis. We analyzed an unprecedented BGC-Argo database of more than 8,500 multivariable profiles collected in various oceanic conditions, from subpolar waters to subtropical gyres. Our objective is to... |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00673/78495/80780.pdf |
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| Antoine, David; Morel, Abdré; Leymarie, Edouard; Houyou, Amel; Gentili, Bernard; Victori, Stephane; Buis, Jean-pierre; Buis, Nicolas; Meunier, Sylvain; Canini, Marius; Crozel, Didier; Fougnie, Bertrand; Henry, Patrice. |
| Miniaturized radiance cameras measuring underwater multispectral radiances in all directions at high-radiometric accuracy (CE600) are presented. The camera design is described, as well as the main steps of its optical and radiometric characterization and calibration. The results show the excellent optical quality of the specifically designed fish-eye objective. They also show the low noise and excellent linearity of the complementary metal oxide semiconductor (CMOS) detector array that is used. Initial results obtained in various oceanic environments demonstrate the potential of this instrument to provide new measurements of the underwater radiance distribution from the sea surface to dimly lit layers at depth. Excellent agreement is obtained between nadir... |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00185/29659/28027.pdf |
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| Ody, Anouck; Doxaran, David; Vanhellemont, Quinten; Nechad, Bouchra; Novoa, Stefani; Many, Gael; Bourrin, Francois; Verney, Romaric; Pairaud, Ivane; Gentili, Bernard. |
| Ocean color satellite sensors are powerful tools to study and monitor the dynamics of suspended particulate matter (SPM) discharged by rivers in coastal waters. In this study, we test the capabilities of Landsat-8/Operational Land Imager (OLI), AQUA&TERRA/Moderate Resolution Imaging Spectroradiometer (MODIS) and MSG-3/Spinning Enhanced Visible and Infrared Imager (SEVIRI) sensors in terms of spectral, spatial and temporal resolutions to (i) estimate the seawater reflectance signal and then SPM concentrations and (ii) monitor the dynamics of SPM in the Rhone River plume characterized by moderately turbid surface waters in a micro-tidal sea. Consistent remote-sensing reflectance (Rrs) values are retrieved in the red spectral bands of these four satellite... |
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Palavras-chave: River plumes; Coastal waters; High resolution; Suspended particulate matter; Remote sensing. |
| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00333/44408/44066.pdf |
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| Diamond, Emilie; Antoine, David; Vellucci, Vincenzo; Gentili, Bernard; Bécu, Guislain; Scott, Alec. |
| Validation of the “geophysical products” derived from observations of satellite ocean colour sensors requires the collection of the same parameters from in situ instrumentation. In particular, the irradiance reflectance or the remote sensing reflectance have to be determined from field measurements of radiometric quantities such as the upward and downward plane irradiances at various depths in the water column. This task has been performed in the frame of the BOUée pour l’acquiSition d’une Série à Long termE (BOUSSOLE) project by using a commercial radiometer system specifically designed for that purpose. This system is built by the Satlantic company (Halifax, Nova Scotia, Canada). It is composed on an in-water profiling radiometer called the “SeaWiFS... |
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| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00655/76701/77860.pdf |
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| Antoine, David; Scott, Alec; Gentili, Bernard. |
| The validation of the “geophysical products” derived from observations of the satellite ocean colour sensors requires the collection of the same parameters from in situ instrumentation. In this report, we focus on the validation of the water-leaving reflectance, and we examine a protocol issue, which is linked to the different ways of deriving at sea a water-leaving reflectance value that is suitable for the validation of this product as it is derived in particular from the MERIS ocean colour sensor observations (see at http://www.envisat/esa.int). The two techniques that we have tested use two very different instrument types. The first one measures the upwelling irradiance in the water column in a free-fall profiling mode, using a multi-channel... |
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| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/00655/76703/77862.pdf |
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