A5030981466- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring and Analysis
- Coral and Marine Ecosystems Studies
- Ocean Acidification Effects and Responses
- Calibration and Measurement Techniques
- Marine and fisheries research
- Atmospheric Ozone and Climate
- Advanced Image Fusion Techniques
- Infrared Target Detection Methodologies
- Optical Imaging and Spectroscopy Techniques
- Geochemistry and Geologic Mapping
- Water Quality Monitoring Technologies
- Oil Spill Detection and Mitigation
- Atmospheric chemistry and aerosols
- Isotope Analysis in Ecology
- Microbial Community Ecology and Physiology
- Remote-Sensing Image Classification
- Potato Plant Research
- Maritime Transport Emissions and Efficiency
- Marine animal studies overview
- Marine and coastal plant biology
- Remote Sensing in Agriculture
Sorbonne Université
2016-2025
Institut de la Mer de Villefranche
2017-2025
Centre National de la Recherche Scientifique
2016-2025
Laboratoire de Biologie du Développement de Villefranche-sur-Mer
2017-2025
United States Marine Corps
2023
Laboratoire d’Océanographie de Villefranche
2016-2020
Optica
2019
Stazione Zoologica Anton Dohrn
2006
Sentinel-2 and Landsat data products when combined open opportunities for capturing the dynamics of nearshore coastal inland waters at rates that have never been possible before. Recognizing differences in their spectral spatial sampling, to generate a seamless record global water quality monitoring, it is critical quantify how well derived agree under various atmospheric aquatic conditions. This study provides an extensive quantitative assessment Landsat-8 Sentinel-2A/B equivalent compare...
Variability in the optical particle backscattering coefficient (b bp ) is investigated oceanic waters from two sites, namely BOUée pour l'acquiSition d'une Série Optique à Long termE site northwestern Mediterranean Sea and Plumes Blooms stations Santa Barbara Channel off Southern California. Data these sites span orders of magnitude b likely cover typical open ocean values. A significant relationship found between at wavelengths 442 555 nm chlorophyll concentration. However large spread this...
Abstract An array of Bio-Argo floats equipped with radiometric sensors has been recently deployed in various open ocean areas representative the diversity trophic and bio-optical conditions prevailing so-called case 1 waters. Around solar noon almost every day, each float acquires 0–250-m vertical profiles photosynthetically available radiation downward irradiance at three wavelengths (380, 412, 490 nm). Up until now, more than 6500 for channel have acquired. As these data are collected out...
Abstract. A global compilation of in situ data is useful to evaluate the quality ocean-colour satellite records. Here we describe compiled for validation products from ESA Ocean Colour Climate Change Initiative (OC-CCI). The were acquired several sources (including, inter alia, MOBY, BOUSSOLE, AERONET-OC, SeaBASS, NOMAD, MERMAID, AMT, ICES, HOT and GeP&CO) span period 1997 2018. Observations following variables compiled: spectral remote-sensing reflectances, concentrations...
Abstract. A global in situ data set for validation of ocean colour products from the ESA Ocean Colour Climate Change Initiative (OC-CCI) is presented. This version compilation, starting 1997, now extends to 2021, which important most recent satellite optical sensors such as Sentinel 3B OLCI and NOAA-20 VIIRS. The comprises observations following variables: spectral remote-sensing reflectance, concentration chlorophyll-a, inherent properties, diffuse attenuation coefficient, total suspended...
Abstract. Total alkalinity (AT) and dissolved inorganic carbon (CT) in the oceans are important properties with respect to understanding ocean cycle its link global change (ocean sinks sources, acidification) ultimately finding carbon-based solutions or mitigation procedures (marine removal). We present a database of more than 44 400 AT CT observations along basic ancillary data (spatiotemporal location, depth, temperature salinity) from various regions obtained, mainly framework French...
A field intercomparison was conducted at the Acqua Alta Oceanographic Tower (AAOT) in northern Adriatic Sea, from 9 to 19 July 2018 assess differences accuracy of in- and above-water radiometer measurements used for validation ocean colour products. Ten measurement systems were compared. Prior intercomparison, absolute radiometric calibration all sensors carried out using same standards methods reference laboratory. Measurements performed under clear sky conditions, relatively low sun zenith...
Abstract Photosynthetic available radiation (PAR) is the light usable by photosynthetic organisms. measurements at depth are required to quantify availability for primary production. Direct PAR may be measured with full‐spectrum quantum sensors range 400 700 nm. When spectrally resolved measured, as downwelling irradiance spectrum , computed numerically integrating within those limits. As varies across a spectral continuum, needs sufficiently large number of bands, provide an unbiased...
Marine photoautotrophs have evolved to exploit the ocean's variable light conditions, with chromatic acclimators being able adjust their pigment content better match ambient color. The impact of acclimation on phytoplankton distribution and competition is not well understood despite its global importance. This study explores acclimation's role in shaping biogeography Synechococcus, a widespread cyanobacterium. We integrated three types into ecosystem model: green-light specialist, blue-light...
Abstract Phytoplankton chlorophyll Sun‐induced fluorescence is observable in the upwelling light field of ocean. This allows its observation by radiometers situ or on satellite sensors. Since it influenced both biomass and physiology can potentially provide information about both. yield complementary to photosynthesis heat photosystem II, throughout day provides response phytoplankton diel cycles. Here we use a time series collected northwestern Mediterranean Sea (BOUSSOLE site) extract...
An efficient system to produce in situ high quality radiometric measurements is compulsory rigorously perform the vicarious calibration of satellite sensors dedicated Ocean Color Radiometry (OCR) and validate their derived products. This requirement especially needed during early stages an OCR activity or for remote areas poorly covered by oceanographic cruises with possible bio-optical anomalies. Taking advantage Argo's profiling float, we present a new autonomous float measurements. The...
Abstract Satellite ocean color observations revealed that unusually deep convection events in 2005, 2006, 2010, and 2013 led to an increased phytoplankton biomass during the spring bloom over a large area of northwestern Mediterranean Sea (NWM). Here we investigate effects these on seasonal community structure, quantify their influence primary production, discuss potential biogeochemical impact. For this purpose, compiled situ pigment data from five ship surveys performed NWM monthly cruises...
In-situ fluorescence is a widely used method to estimate the chlorophyll-a (Chla) concentration, proxy of phytoplankton biomass. With emergence autonomous platforms such as BioGeoChemical-Argo (BGC-Argo) profiling floats, its use has expanded global scale observations. However, relationship between in-situ and Chla may vary significantly, leading major discrepancies oceanic regions. This study aims investigate main sources natural variability in signal open ocean, specifically influence...
Abstract. Two 3-year time series of hourly measurements the fugacity CO2 (fCO2) in upper 10 m surface layer northwestern Mediterranean Sea have been recorded by CARIOCA sensors almost two decades apart, 1995–1997 and 2013–2015. By combining them with alkalinity derived from measured temperature salinity, we calculate changes pH dissolved inorganic carbon (DIC). DIC increased seawater ∼25 µmol kg−1 fCO2 40 µatm, whereas decreased ∼0.04 (0.0022 yr−1). The increase is about 15 % larger than...
Particulate optical backscattering (bbp) is a crucial parameter for the study of ocean biology and oceanic carbon estimations. In this work, bbp retrieval, by quasi-analytical algorithm (QAA), assessed using large in situ database matched remote-sensing reflectance (Rrs). The QAA also applied to satellite Rrs (ESA OC-CCI project) as well, after their validation against Rrs. Additionally, effect Raman Scattering on retrievals studied. Results show negligible biases above random noise when...
Abstract Vicarious calibration coefficients ( k v ) of Second-generation GLobal Imager (SGLI) for ocean color processing were derived using in-situ radiometric buoy measurements from the Marine Optical BuoY (MOBY) and BOUée pour l'acquiSition d'une Série Optique à Long termE (BOUSSOLE). Two aerosol-model look up tables (LUTs) used in GCOM-C aerosol retrieval algorithm (LUT-A) previous version atmospheric correction (LUT-B) tested procedures to calculate retrieve remote sensing reflectance R...
In this study, we report on the performance of satellite-based photosynthetically available radiation (PAR) algorithms used in published oceanic primary production models. The these was evaluated using buoy observations under clear and cloudy skies, for particular case low sun angles typically encountered at high latitudes or moderate winter. PAR models consisted (i) standard one from NASA-Ocean Biology Processing Group (OBPG), (ii) Gregg Carder (GC) semi-analytical clear-sky model, (iii)...
Linear regression is widely used in applied sciences and, particular, satellite optical oceanography, to relate dependent independent variables. It often adopted establish empirical algorithms based on a finite set of measurements, which are later observations larger scale from platforms such as autonomous profiling floats equipped with instruments (e.g., Biogeochemical Argo floats; BGC-Argo floats) and ocean colour sensors SeaWiFS, VIIRS, OLCI). However, different methods can be given pair...
Abstract. A global in-situ data set for validation of ocean-colour products from the ESA Ocean Colour Climate Change Initiative (OC-CCI) is presented. This version compilation, starting in 1997, now extends to 2021, which important most recent satellite optical sensors such as Sentinel 3B OLCI and NOAA-20 VIIRS. The comprises observations following variables: spectral remote-sensing reflectance, concentration chlorophyll-a, inherent properties, diffuse attenuation coefficient total suspended...
Abstract. A multiplatform assessment of the Ocean–Atmosphere Spectral Irradiance Model (OASIM) radiative model focussed on Mediterranean Sea for period 2004–2017 is presented. The BOUée pour l'acquiSition d'une Série Optique à Long termE (BOUSSOLE) mooring and biogeochemical Argo (BGC-Argo) float optical sensor observations are combined with outputs to analyse spatial temporal variabilities in downward planar irradiance at ocean–atmosphere interface. correlations between data always higher...
Abstract A new framework that enables evaluation of the in situ ocean color radiometry measurement uncertainty is presented. The study was conducted on multispectral data from a permanent mooring deployed clear open water. evaluated for each component equation and processing step leads to deriving remote sensing reflectance. Monte Carlo method selected handle complexity such as correlation nonlinearity an efficient manner. results are presented prescreened dataset suitable system vicarious...