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| Registros recuperados: 20 | |
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| Valente, Andre; Sathyendranath, Shubha; Brotas, Vanda; Groom, Steve; Grant, Michael; Taberner, Malcolm; Antoine, David; Arnone, Robert; Balch, William M.; Barker, Kathryn; Barlow, Ray; Belanger, Simon; Berthon, Jean-francois; Besiktepe, Sukru; Brando, Vittorio; Canuti, Elisabetta; Chavez, Francisco; Claustre, Herve; Crout, Richard; Frouin, Robert; Garcia-soto, Carlos; Gibb, Stuartw.; Gould, Richard; Hooker, Stanford; Kahru, Mati; Klein, Holger; Kratzer, Susanne; Loisel, Hubert; Mckee, David; Mitchell, Brian G.; Moisan, Tiffany; Muller-karger, Frank; O'Dowd, Leonie; Ondrusek, Michael; Poulton, Alex J.; Repecaud, Michel; Smyth, Timothy; Sosik, Heidi M.; Twardowski, Michael; Voss, Kenneth; Werdell, Jeremy; Wernand, Marcel; Zibordi, Giuseppe. |
| A compiled set of in situ data is important to evaluate the quality of ocean-colour satellite-data records. Here we describe the data compiled for the validation of the ocean-colour products from the ESA Ocean Colour Climate Change Initiative (OC-CCI). The data were acquired from several sources (MOBY, BOUSSOLE, AERONET-OC, SeaBASS, NOMAD, MERMAID, AMT, ICES, HOT, GeP&CO), span between 1997 and 2012, and have a global distribution. Observations of the following variables were compiled: spectral remote-sensing reflectances, concentrations of chlorophyll a, spectral inherent optical properties and spectral diffuse attenuation coefficients. The data were from multi-project archives acquired via the open internet services or from individual projects,... |
| Tipo: Text |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00346/45674/45298.pdf |
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| Valente, Andre; Sathyendranath, Shubha; Brotas, Vanda; Groom, Steve; Grant, Michael; Taberner, Malcolm; Antoine, David; Arnone, Robert; Balch, William M.; Barker, Kathryn; Barlow, Ray; Belanger, Simon; Berthon, Jean-francois; Besiktepe, Suikru; Borsheim, Yngve; Bracher, Astrid; Brando, Vittorio; Canuti, Elisabetta; Chavez, Francisco; Cianca, Andres; Claustre, Herve; Clementson, Lesley; Crout, Richard; Frouin, Robert; Garcia-soto, Carlos; Gibb, Stuart W.; Gould, Richard; Hooker, Stanford B.; Kahru, Mati; Kampel, Milton; Klein, Holger; Kratzer, Susanne; Kudela, Raphael; Ledesma, Jesus; Loisel, Hubert; Matrai, Patricia; Mckee, David; Mitchell, Brian G.; Moisan, Tiffany; Muller-karger, Frank; O'Dowd, Leonie; Ondrusek, Michael; Platt, Trevor; Poulton, Alex J.; Repecaud, Michel; Schroeder, Thomas; Smythe, Timothy; Smythe-wright, Denise; Sosik, Heidi M.; Twardowski, Michael; Vellucci, Vincenzo; Voss, Kenneth; Werdell, Jeremy; Wernand, Marcel; Wright, Simon; Zibordi, Giuseppe. |
| A global compilation of in situ data is useful to evaluate the quality of ocean-colour satellite data records. Here we describe the data compiled for the validation of the ocean-colour products from the ESA Ocean Colour Climate Change Initiative (OC-CCI). The data were acquired from several sources (including, inter alia, MOBY, BOUSSOLE, AERONET-OC, SeaBASS, NOMAD, MERMAID, AMT, ICES, HOT and GeP&CO) and span the period from 1997 to 2018. Observations of the following variables were compiled: spectral remote-sensing reflectances, concentrations of chlorophyll a, spectral inherent optical properties, spectral diffuse attenuation coefficients and total suspended matter. The data were from multi-project archives acquired via open internet services or from... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00508/61937/66031.pdf |
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| Bellacicco, Marco; Ciani, Daniele; Doxaran, David; Vellucci, Vincenzo; Antoine, David; Wang, Menghua; D'Ortenzio, Fabrizio; Marullo, Salvatore. |
| Currently, observations from low-Earth orbit (LEO) ocean color sensors represent one of the most used tools to study surface optical and biogeochemical properties of the ocean. LEO observations are available at daily temporal resolution, and are often combined into weekly, monthly, seasonal, and annual averages in order to obtain sufficient spatial coverage. Indeed, daily satellite maps of the main oceanic variables (e.g., surface phytoplankton chlorophyll-a) generally have many data gaps, mainly due to clouds, which can be filled using either Optimal Interpolation or the Empirical Orthogonal Functions approach. Such interpolations, however, may introduce large uncertainties in the final product. Here, our goal is to quantify the potential benefits of... |
| Tipo: Text |
Palavras-chave: Remote sensing; Ocean color products; Geostationary sensor; Baltic Sea. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00585/69693/67578.pdf |
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| Guinet, Christophe; Xing, X.; Walker, E; Monestiez, P; Marchand, S.; Picard, Baptiste; Jaud, T.; Authier, Matthieu; Cotte, Cedric; Dragon, Ac; Diamond, E; Antoine, David; Lovell, P.; Blain, Stephane; D'Ortenzio, Fabrizio; Claustre, Herve. |
| In situ observation of the marine environment has traditionally relied on ship-based platforms. The obvious consequence is that physical and biogeochemical properties have been dramatically undersampled, especially in the remote Southern Ocean (SO). The difficulty in obtaining in situ data represents the major limitations to our understanding, and interpretation of the coupling between physical forcing and the biogeochemical response. Southern elephant seals (Mirounga leonina) equipped with a new generation of oceanographic sensors can measure ocean structure in regions and seasons rarely observed with traditional oceanographic platforms. Over the last few years, seals have allowed for a considerable increase in temperature and salinity profiles from the... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00185/29663/28034.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... |
| Tipo: Text |
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| Ano: 2004 |
URL: https://archimer.ifremer.fr/doc/00655/76703/77862.pdf |
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| Kheireddine, Malika; Antoine, David. |
| The diel variability of the particulate beam attenuation coefficient, cp, and of the particulate backscattering coefficient, bbp, were investigated during five seasonal cycles at an oceanic site in the northwestern Mediterranean Sea, covering contrasting physical and trophic situations. We observed a diel cycle in cp and bbp, related to changes in phytoplankton properties (i. e., size and refractive index) induced by the accumulation of carbon within phytoplankton cells associated with photosynthetic processes, during the winter mixing of the water column, the development of the spring phytoplankton bloom, its decline, and during the summer oligotrophy. The relative amplitude of the cp diel variability was much larger during the spring bloom (20-50%) than... |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00287/39859/38406.pdf |
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| Merlivat, Liliane; Boutin, Jacqueline; Antoine, David; Beaumont, Laurence; Golbol, Melek; Vellucci, Vincenzo. |
| Two 3-year time series of hourly measurements of the fugacity of CO2 (f CO2) in the upper 10 m of the surface layer of the northwestern Mediterranean Sea have been recorded by CARIOCA sensors almost two decades apart, in 1995-1997 and 2013-2015. By combining them with the alkalinity derived from measured temperature and salinity, we calculate changes in pH and dissolved inorganic carbon (DIC). DIC increased in surface seawater by similar to 25 mu mol kg(-1) and fCO(2) by 40 mu atm, whereas seawater pH decreased by similar to 0.04 (0.0022 yr(-1)). The DIC increase is about 15 % larger than expected from the equilibrium with atmospheric CO2. This could result from natural variability, e.g. the increase between the two periods in the frequency and intensity... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00585/69695/67582.pdf |
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| Mantoura, F; Coppola, Laurent; Cousin, M.; Antoine, David; Beguery, Laurent; Blain, Stephane; Bouin, Marie-noelle; Cadiou, Jean-francois; Durrieu De Madron, Xavier; Forget, Philippe; Fraunie, Philippe; Gojak, Carl; Gorsky, Gaby; Goyet, Catherine; Lebaron, Philippe; Lellouche, Jean-michel; Ludwig, Hubert; Molcard, Anne; Mortier, Laurent; Petit De La Villeon, Loic; Petrenko, Anne; Piazzola, J.; Queguiner, B.; Raimbault, Patrick; Rigaud, Vincent; Sempere, Richard; Tamburini, Jean-simon; Testor, Pierre; Vuillemin, Renaud; Zakardjian, B.. |
| Tipo: Text |
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| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00122/23341/21166.pdf |
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| Organelli, Emanuele; Bricaud, Annick; Antoine, David; Uitz, Julia. |
| Models based on the multivariate partial least squares (PLS) regression technique are developed for the retrieval of phytoplankton size structure from measured light absorption spectra (BOUSSOLE site, northwestern Mediterranean Sea). PLS-models trained with data from the Mediterranean Sea showed good accuracy in retrieving, over the nine-year BOUSSOLE time series, the concentrations of total chlorophyll a [Tchl a], of the sum of seven diagnostic pigments and of pigments associated with micro, nano, and picophytoplankton size classes separately. PLS-models trained using either total particle or phytoplankton absorption spectra performed similarly, and both reproduced seasonal variations of biomass and size classes derived by high performance liquid... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00185/29655/28031.pdf |
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| Salgado-hernanz, Paula Maria; Regaudie De Gioux, Aurore; Antoine, David; Basterretxea, Gotzon. |
| We estimated pelagic primary production (PP) in the coastal (< 200 m depth) Mediterranean Sea from satellite-borne data, its contribution to basin-scale carbon fixation, its variability and long-term trends during the period 2002–2016. Annual coastal PP was estimated at 0.041 Gt C, which approximately represents 12 % of total carbon fixation in the Mediterranean Sea. About 50 % of this production occurs in the eastern basin, whereas the western and Adriatic shelves contribute with 25 % each of total coastal production. Strong regional variability is revealed, from high-production areas (> 300 g C m−2) associated with major river discharges, to less productive provinces (< 50 g C m−2) located in the southeastern Mediterranean. PP variability in the... |
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| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00669/78073/80306.pdf |
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| Martinez, Elodie; Antoine, David; D'Ortenzio, Fabrizio; De Boyer Montegut, Clément. |
| Phytoplankton chlorophyll-a (Chl) seasonal cycles of the North Atlantic are described using satellite ocean color observations covering the 1980s and the 2000s. The study region is where warmer SST and higher Chl in the 2000s as compared to the 1980s have been reported. It covers latitudes from 30 degrees N-50 degrees N and longitudes from 60 degrees W-0 degrees W, where two phytoplankton blooms take place: a spring bloom that follows stratification of upper layers, and a fall bloom due to nutrient entrainment through deepening of the mixed layer. In the 1980s, spring and fall blooms were of similar amplitude over the entire study region. In the 2000s, the fall bloom was weaker in the eastern Atlantic (east of 40 degrees W), because of a delayed deepening... |
| Tipo: Text |
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| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00054/16556/14070.pdf |
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| Leymarie, Edouard; Penkerc'H, Christophe; Vellucci, Vincenzo; Lerebourg, Christophe; Antoine, David; Boss, Emmanuel; Lewis, Marion R.; D'Ortenzio, Fabrizio; Claustre, Herve. |
| An efficient system to produce in situ high quality radiometric measurements is compulsory to rigorously perform the vicarious calibration of satellite sensors dedicated to Ocean Color Radiometry (OCR) and to validate their derived products. This requirement is especially needed during the early stages of an OCR satellite activity or for remote areas poorly covered by oceanographic cruises with possible bio-optical anomalies. Taking advantage of Argo's profiling float technology, we present a new autonomous profiling float dedicated to in situ radiometric measurements. The float is based on the Provor CTS5 (manufacturer NKE) with an added novel two protruding arm design allowing for sensor redundancies, shading mitigation and near-surface data. Equipped... |
| Tipo: Text |
Palavras-chave: Autonomous profiling floats; Remote sensing reflectance; Ocean color; Validation; System vicarious calibration; Austral ocean; Mediterranean Sea; Radiometric measurement. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00585/69694/67579.pdf |
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| Barnes, Morvan; Antoine, David. |
| A 6 yr time series of high frequency inherent optical property (IOP) measurements in the Mediterranean was used to derive information on the diel and seasonal variability of particulate production. Empirical relationships between particulate attenuation (c(p)), particulate backscattering (b(bp)), and particulate organic carbon allowed calculation of estimates of net community production (NCP), daytime NCP (NCPd), and gross community production (GCP) from the diel variations in either IOP. Similar seasonal variations and good correlation (r = 5 0.83, p < 0.001) between daily means of c(p) and b(bp) were observed, yet differences in the timing and amplitude of their diel cycles led to significant differences in their derived production metrics. Best... |
| Tipo: Text |
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| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00298/40876/39924.pdf |
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| Xing, Xiaogang; Claustre, Herve; Blain, Stephane; D'Ortenzio, Fabrizio; Antoine, David; Ras, Josephine; Guinet, Christophe. |
| As the proxy for Chlorophyll a (Chl a) concentration, thousands of fluorescence profiles were measured by instrumented elephant seals in the Kerguelen region (Southern Ocean). For accurate retrieval of Chl a concentrations acquired by in vivo fluorometer, a two-step procedure is applied: 1) A predeployment intercalibration with accurate determination by high performance liquid chromatography (HPLC) analysis, which not only calibrates fluorescence in appropriate Chl a concentration units, but also strongly reduces variability between fluorometers, and 2) a profile-by-profile quenching correction analysis, which effectively eliminates the fluorescence quenching issue at surface around noon, and results in consistent profiles between day and night. The... |
| Tipo: Text |
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| Ano: 2012 |
URL: https://archimer.ifremer.fr/doc/00248/35965/36927.pdf |
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| Antoine, David; Vellucci, Vincenzo; Banks, Andrew C.; Bardey, Philippe; Bretagnon, Marine; Bruniquel, Véronique; Deru, Alexis; Hembise Fanton D’andon, Odile; Lerebourg, Christophe; Mangin, Antoine; Crozel, Didier; Victori, Stéphane; Kalampokis, Alkiviadis; Karageorgis, Aristomenis P.; Petihakis, George; Psarra, Stella; Golbol, Melek; Leymarie, Edouard; Bialek, Agnieszka; Fox, Nigel; Hunt, Samuel; Kuusk, Joel; Laizans, Kaspars; Kanakidou, Maria. |
| The European Copernicus programme ensures long-term delivery of high-quality, global satellite ocean colour radiometry (OCR) observations from its Sentinel-3 (S3) satellite series carrying the ocean and land colour instrument (OLCI). In particular, the S3/OLCI provides marine water leaving reflectance and derived products to the Copernicus marine environment monitoring service, CMEMS, for which data quality is of paramount importance. This is why OCR system vicarious calibration (OC-SVC), which allows uncertainties of these products to stay within required specifications, is crucial. The European organisation for the exploitation of meteorological satellites (EUMETSAT) operates the S3/OLCI marine ground segment, and envisions having an SVC infrastructure... |
| Tipo: Text |
Palavras-chave: Satellite ocean colour; System vicarious calibration; Fiducial reference measurements; Radiometry; SI-traceability; Uncertainty budget; Mediterranean Sea; BOUSSOLE; MSEA. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00629/74136/73601.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... |
| Tipo: Text |
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| Ano: 2013 |
URL: https://archimer.ifremer.fr/doc/00655/76701/77860.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... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00185/29659/28027.pdf |
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| Registros recuperados: 20 | |
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