A5075170909- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Water Quality Monitoring and Analysis
- Marine Biology and Ecology Research
- Marine and fisheries research
- Spacecraft Design and Technology
- Coral and Marine Ecosystems Studies
- Air Quality Monitoring and Forecasting
- Oil Spill Detection and Mitigation
- Marine Bivalve and Aquaculture Studies
- Ionosphere and magnetosphere dynamics
- Environmental Monitoring and Data Management
- Coastal and Marine Dynamics
- Air Quality and Health Impacts
- Marine and coastal plant biology
- Remote Sensing in Agriculture
- Atmospheric chemistry and aerosols
- earthquake and tectonic studies
- Isotope Analysis in Ecology
- Coastal and Marine Management
- Methane Hydrates and Related Phenomena
- Advanced Image Fusion Techniques
- Remote-Sensing Image Classification
ACRI Group (France)
2002-2024
UK Dementia Research Institute
2021-2024
Cardiff University
2021-2024
Fondation Sophia Antipolis
2011-2024
Centre de Recherche en Myologie
2021
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2021
University College London
2021
Sorbonne Université
2021
Institut de Myologie
2021
Inserm
2021
Ocean color measured from satellites provides daily, global estimates of marine inherent optical properties (IOPs). Semi-analytical algorithms (SAAs) provide one mechanism for inverting the water observed by satellite into IOPs. While numerous SAAs exist, most are similarly constructed and few appropriately parameterized all masses seasons. To initiate community-wide discussion these limitations, NASA organized two workshops that deconstructed to identify similarities uniqueness progress...
Atmospheric correction over inland and coastal waters is one of the major remaining challenges in aquatic remote sensing, often hindering quantitative retrieval biogeochemical variables analysis their spatial temporal variability within environments. The Correction Intercomparison Exercise (ACIX-Aqua), a joint NASA – ESA activity, was initiated to enable thorough evaluation eight state-of-the-art atmospheric (AC) processors available for Landsat-8 Sentinel-2 data processing. Over 1000...
The Atmospheric Correction Inter-comparison eXercise (ACIX) is an international initiative with the aim to analyse Surface Reflectance (SR) products of various state-of-the-art atmospheric correction (AC) processors. Aerosol Optical Thickness (AOT) and Water Vapour (WV) are also examined in ACIX as additional outputs AC processing. In this paper, general framework discussed; special mention made motivation initiate experiment, inter-comparison protocol, principal results. free open every...
The Copernicus Marine Services State of Pacific Ocean analysis available data demonstrates that the ocean surrounding Islands is warmer, has higher heat content, with sea level rising at rates
Abstract. This paper concerns the GlobColour-merged chlorophyll a products based on satellite observation (SeaWiFS, MERIS, MODIS, VIIRS and OLCI) disseminated in framework of Copernicus Marine Environmental Monitoring Service (CMEMS). work highlights main advantages provided by GlobColour processor which is used to serve CMEMS with long time series from 1997 present at global level (4 km spatial resolution) for Atlantic 4 product (1 resolution). To compute merged product, two major topics...
We present algorithms for the estimation of vertical diffuse attenuation coefficient, K d (m −1 ), and beam c at 490 nm from irradiance reflectance. Our aim is to retrieve as analytically possible [ (490) + (490)] , a proxy visibility. The two are based on semianalytical retrieval absorption coefficient ) backscattering b reflectance wavelengths, 709 nm. use near‐infrared wave band allows small number simple assumptions be made, (1) light only due pure seawater, (2) there exists constant...
Abstract In 2013, as part of the French NAOS (Novel Argo Oceanic observing System) program, five profiling floats equipped with nitrate sensors (SUNA‐V2) together CTD and bio‐optical were deployed in Mediterranean Sea. At present day, more than 500 profiles physical biological parameters acquired, significantly increased number available data Results obtained from confirm general view basin, well‐known west‐to‐east gradient oligotrophy. seasonal scale, north western displays a clear...
This study presents an algorithm for globally retrieving chlorophyll a (Chl-a) concentrations of phytoplankton functional types (PFTs) from multi-sensor merged ocean color (OC) products or Sentinel-3A (S3) Ocean and Land Color Instrument (OLCI) data the GlobColour archive in frame Copernicus Marine Environmental Monitoring Service (CMEMS). The retrieved PFTs include diatoms, haptophytes, dinoflagellates, green algae prokaryotic phytoplankton. A previously proposed method to retrieve various...
Coccolithophores (calcifying phytoplankton) form extensive blooms in temperate and subpolar oceans as evidenced from ocean-color satellites. This study examines the potential to detect coccolithophore with BioGeoChemical-Argo (BGC-Argo) floats, autonomous ocean profilers equipped bio-optical physicochemical sensors. We first matched float data satellite of calcite concentration select floats that sampled blooms. identified two Southern Ocean, which measured particulate beam attenuation coefficient (
Abstract Arctic warming alters land‐to‐sea fluxes of nutrients and organic matter, which impact air‐sea carbon exchange. Here we use an ocean‐biogeochemical model the southeastern Beaufort Sea (SBS) to investigate role Mackenzie River biogeochemical discharge in modulating CO 2 during 2000–2019. The contribution six constituents leads a net outgassing 0.13 TgC yr −1 , with decrease coastal SBS sink 0.23 0.4 due riverine dissolved inorganic carbon, respectively. Years high (low) promote more...
Abstract. Since 2012, an array of 105 Biogeochemical-Argo (BGC-Argo) floats has been deployed across the world's oceans to assist in filling observational gaps that are required for characterizing open-ocean environments. Profiles biogeochemical (chlorophyll and dissolved organic matter) optical (single-wavelength particulate backscattering, downward irradiance at three wavelengths, photosynthetically available radiation) variables collected upper 1000 m every 1 10 days. The database 9837...
We present a three-step inverse model (3SAA) for estimating the inherent optical properties (IOPs) of surface waters from remote sensing reflectance spectra, Rrs(λ). The derived IOPs include total (a(λ)), phytoplankton (aphy(λ)), and colored detrital matter (acdm(λ)), absorption coefficients, (bb(λ)) particulate (bbp(λ)) backscattering coefficients. first step uses an improved neural network approach to estimate diffuse attenuation coefficient downwelling irradiance Rrs. a(λ) bbp(λ) are then...
Myotonic dystrophy type 1 (DM1) is the most complex and variable trinucleotide repeat disorder caused by an unstable CTG expansion, reaching up to 4000 in severe cases. The genetic clinical variability of DM1 depend on sex age transmitting parent, but also number, presence interruptions and/or degree somatic instability. Currently, it difficult simultaneously accurately determine these contributing factors patients due limitations gold standard methods used molecular diagnostics research...
Abstract. The European Space Agency's Aeolus satellite, equipped with the Atmospheric LAser Doppler INstrument (ALADIN), provides global near-global wind profiles from surface to about 30 km altitude. These measurements enable investigation of atmospheric dynamics, including gravity waves (GWs) in upper troposphere and lower stratosphere (UTLS). This study analyzes ALADIN observations ERA5 reanalysis, by deriving GWs kinetic energy (Ek) distributions, examining their temporal spatial...
Both uncertainty assessment and validation have shown that the current global products of phytoplankton functional types (PFT) on Copernicus Marine Service for Arctic Ocean (AO) bear larger gaps higher uncertainties compared to in low latitude oceans. In framework Evolution Program, we propose a project ML-PhyTAO exploit marine big data-driven machine learning (ML) methods PFT monitoring high latitudes, aim set up an improved algorithm better quantifications multiple PFTs AO. A large data...
Marine and coastal environments host a great biodiversity supply multiple services for human activities, such as food jobs availability. However, these zones are also affected by anthropic pressure particularly vulnerable to climate change. In order protect its marine ecosystems foster sustainable use of the resources, European Union adopted Strategy Framework Directive in 2008. This directive tasked each Member State define strategy reach “Good Environmental Status” (GES). Among descriptors...
The increase of atmospheric CO2 levels by as much about 10% since the beginning 21st century and its impact on Earth’s climate biosphere represent a major concern. Based compilation in situ data extrapolated over global coastal ocean, previous studies indicate that world’s shelves absorb 0.25 Pg C/year (~17% oceanic influx), although these areas only 7% surface area. However, large uncertainties carbon fluxes stocks exists due to their under sampling both space time. Moreover, all methods...
Effective monitoring of Dissolved Organic Carbon (DOC) from space is crucial for tracking carbon stocks and understanding fluctuations in both coastal open ocean environments. As part the OCROC project, founded by Copernicus Marine Service, we have enhanced existing Ocean Land Color Instrument (OLCI) DOC algorithm, designed to leverage data historical current color sensors. This algorithm initially used four key inputs: absorption coefficient Colored Matter (acdom), chlorophyll-a...
Coastal areas are hotspots of human activity and among the most productive ecosystems, providing essential resources services. However, these zones increasingly under pressure from activities climate change, which threaten their ecological balance long-term sustainability. Remote sensing provides a crucial tool for monitoring coastal areas, allowing timely detection environmental changes impacts. More specifically, ocean color on waters is key parameter where significant progress can be...