A5016556589- Marine and coastal ecosystems
- Marine Biology and Ecology Research
- Oceanographic and Atmospheric Processes
- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Aeolian processes and effects
- Atmospheric and Environmental Gas Dynamics
- Water Quality Monitoring and Analysis
- Atmospheric Ozone and Climate
- Methane Hydrates and Related Phenomena
- Ocean Acidification Effects and Responses
- Coral and Marine Ecosystems Studies
- Isotope Analysis in Ecology
- Arctic and Antarctic ice dynamics
- Environmental Monitoring and Data Management
- Water Quality Monitoring Technologies
- Remote-Sensing Image Classification
- Geological and Geophysical Studies
- Remote Sensing in Agriculture
- Particle Dynamics in Fluid Flows
- Impact of Light on Environment and Health
- Calibration and Measurement Techniques
- Air Quality and Health Impacts
- Hydrocarbon exploration and reservoir analysis
- Vehicle emissions and performance
Centre National de la Recherche Scientifique
2015-2024
Sorbonne Université
2015-2024
Terra
2024
Observatoire des sciences de l'Univers Paris-Centre Ecce Terra
2016-2023
Observatoire des sciences de l'Univers Paris-Saclay
2018-2022
Laboratoire d’Océanographie de Villefranche
2015-2021
Université Paris Cité
2005-2021
Stazione Zoologica Anton Dohrn
2020
Laboratoire Interuniversitaire des Systèmes Atmosphériques
2005-2016
Institut Pierre-Simon Laplace
2011-2016
The Argo Program has been implemented and sustained for almost two decades, as a global array of about 4000 profiling floats. provides continuous observations ocean temperature salinity versus pressure, from the sea surface to 2000 dbar. successful installation its innovative data management system arose opportunistically combination great scientific need technological innovation. Through system, fundamental physical with broad societally-valuable applications, built on cost-efficient robust...
Chlorophyll fluorometers provide the largest in situ global data set for estimating phytoplankton biomass because of their ease use, size, power consumption, and relatively low price. While chlorophyll a (Chl) fluorescence is proxy Chl concentration, hence biomass, there exist large natural variations relationship between extracted concentration. Despite this variability, we present here validation WET Labs Environmental Characterization Optics (ECO) series that suggests factor 2...
The Biogeochemical-Argo program (BGC-Argo) is a new profiling-float-based, ocean wide, and distributed monitoring which tightly linked to, has benefited significantly from, the Argo program. community recommended for BGC-Argo addition of six measurements in to pressure, temperature salinity measured by Argo, include oxygen, pH, nitrate, downwelling light, chlorophyll fluorescence optical backscattering coefficient. purpose this enable biogeochemistry health, particular, monitor major...
Stratified oceanic systems are characterized by the presence of a so-called Deep Chlorophyll Maximum (DCM) not detectable ocean color satellites. A DCM can either be phytoplankton (carbon) biomass maximum (Deep Biomass Maximum, DBM), or consequence photoacclimation processes photoAcclimation DAM) resulting in increase chlorophyll per carbon. Even though these (further qualified as DBMs DAMs) have long been studied, no global-scale assessment has yet undertaken and large knowledge gaps still...
In this paper, we outline the need for a coordinated international effort toward building of an open-access Global Ocean Oxygen Database and ATlas (GO 2 DAT) complying with FAIR principles (Findable, Accessible, Interoperable, Reusable). GO DAT will combine data from coastal open ocean, as measured by chemical Winkler titration method or sensors (e.g., optodes, electrodes) Eulerian Lagrangian platforms ships, moorings, profiling floats, gliders, ships opportunities, marine mammals, cabled...
Abstract The present study proposes a novel method that merges satellite ocean color bio‐optical products with Argo temperature‐salinity profiles to infer the vertical distribution of particulate backscattering coefficient (b bp ) . This neural network‐based (SOCA‐BBP for Satellite Ocean‐Color merged data Particulate Backscattering coefficient) uses three main input components: (1) satellite‐based surface estimates b and chlorophyll concentration matched up in space time (2) depth‐resolved...
Autonomous and cabled platforms are revolutionizing our understanding of ocean systems by providing 4D monitoring the water column, thus going beyond reach ship-based surveys increasing depth remotely sensed observations. However, very few commercially available sensors for such capable large particulate matter (100-2000 μm) plankton despite their important roles in biological carbon pump as trophic links from phytoplankton to fish. Here, we provide details a new, scientific camera-based...
To determine the location of potential dust source regions and to evaluate emission frequencies over arid semiarid areas China Mongolia (35.5°N–47°N; 73°E–125°E), we established a map Z 0 from composition protrusion coefficient (PC) derived POLDER‐1 bidirectional reflectance distribution function (BRDF). Using ° × resolution data set, 10‐m erosion threshold wind velocity for Chinese Mongolian deserts. The retrieved thresholds range 7 m s −1 in sandy deserts (Taklimakan, Badain Jaran, Tengger...
The making of atmospheric corrections is a critical task in the interpretation ocean color imagery. In coastal areas, fraction light reflected by land reaches sensor. Modeling reduction image contrast when turbidity increases, so-called adjacency effect, requires large amounts computing time. To model this effect we developed simple approach based on primary scattering approximation for both nadir and off-nadir views. A sensitivity study indicates that decisive criterion measurement accuracy...
Abstract. We performed airborne measurements of aerosol particle concentration, composition, size distribution and optical properties over Western Africa in the corridor 2–17° N 3–5° E. Data were collected on board French ATR-42 research aircraft June–July 2006 as part African Monsoon Multidisciplinary Analysis (AMMA) intensive field phases using AVIRAD sampling system. The vertical was documented an almost daily basis. In particular, mineral dust emitted locally by Mesoscale Convective...
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 Characterizing phytoplankton distribution and dynamics in the world's open oceans requires situ observations over a broad range of space time scales. In addition to temperature/salinity measurements, Biogeochemical‐Argo (BGC‐Argo) profiling floats are capable autonomously observing at high‐frequency bio‐optical properties such as chlorophyll fluorescence, proxy concentration (Chl ), particulate backscattering coefficient (b bp stock organic carbon, light available for...
Abstract. As commonly observed in oligotrophic stratified waters, a subsurface (or deep) chlorophyll maximum (SCM) frequently characterizes the vertical distribution of phytoplankton Mediterranean Sea. Occurring far from surface layer “seen” by ocean colour satellites, SCMs are difficult to observe with adequate spatio-temporal resolution and their biogeochemical impact remains unknown. Biogeochemical-Argo (BGC-Argo) profiling floats represent appropriate tools for studying dynamics SCMs....
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...
The necessity of wide, global-scale observing systems for marine biogeochemistry emerged dramatically in the last decade. A global network based on Biogeochemical (BGC) Argo floats is considered as one most promising approaches reaching this goal. As a first step, pilot studies were encouraged to test feasibility BGC-Argo array, consolidate methods and practices under development, set up array's characteristics. study Mediterranean Sea—deemed suitable candidate case because it combines...
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...
Abstract Understanding spatial and temporal dynamics of non‐algal particles in open ocean is the utmost importance to improve estimations carbon export sequestration. These covary with phytoplankton abundance but also accumulate independently algal dynamics. The latter likely represents an important fraction organic carbon, it largely overlooked. A possible way study these via their optical backscattering properties (b bp ) relationship chlorophyll‐ a (Chl). To this aim, we estimate b...
Abstract. The Green Edge initiative was developed to investigate the processes controlling primary productivity and fate of organic matter produced during Arctic phytoplankton spring bloom (PSB) determine its role in ecosystem. Two field campaigns were conducted 2015 2016 at an ice camp located on landfast sea southeast Qikiqtarjuaq Island Baffin Bay (67.4797∘ N, 63.7895∘ W). During both expeditions, a large suite physical, chemical biological variables measured beneath consolidated sea-ice...
Abstract In the eastern Mediterranean Sea, satellites have observed events of spring surface‐chlorophyll increase in Rhodes Gyre region recurring intermittently. Few situ biogeochemical data, however, exist to confirm their consistency, elucidate seasonal characteristics, or discriminate among possible drivers. During year 2018, an array BGC‐Argo floats was deployed region, collecting first‐ever annual time series profiles parameters this area. Their observations demonstrated that nitrates,...
Abstract. Partial lower tropospheric ozone columns provided by the IASI (Infrared Atmospheric Sounding Interferometer) instrument have been assimilated into a chemistry-transport model at continental scale (CHIMERE) using an Ensemble Square Root Kalman Filter (EnSRF). Analyses are made for month of July 2007 over European domain. Launched in 2006, aboard MetOp-A satellite, shows high sensitivity free troposphere and low ground; therefore it is important to evaluate if assimilation these...
To address the challenging issue of estimating mineral dust emissions from semi‐arid Sahel, a modeling approach is developed by combining two specific models: one dedicated to simulation seasonal herbaceous layer in Sahel (STEP) and other estimation (MB). The area interest Sahelian belt (12°N–20°N, 20°W–35°E) simulations were performed at 0.25° spatial resolution over 4‐year period (2004–2007). rainfall forcing provided TRMM (Tropical Rainfall Measuring Mission) satellite‐derived product;...
Abstract Total and wet mineral dust deposition has been monitored since 2006 at three Sahelian stations in Senegal, Mali, Niger, respectively the weekly event time scale. Average annual deposited mass fluxes range from 75 to 183 g m −2 yr −1 , west east. Deposition exhibit a clear seasonal cycle Mali Niger. High result an optimum phasing between concentration precipitation: maximum occurring beginning of season, after before precipitation maximum. The contribution total varies 67% 8%...
Abstract Atmospheric dust concentrations are very sensitive to the surface emissions that mainly controlled by saltation and sandblasting processes. Thus, a correct modeling of directly depends on mass flux parameterization accuracy. In 2001, Alfaro Gomes proposed whole set parameterizations linking wind speed soil characteristics. Their formulation is based integration elementary fluxes, discretized along size distribution. But, because threshold process, this discretization must be as fine...
Phytoplankton biomass, the foundation of oceanic food web, is predominantly estimated from chlorophyll-a (Chla) concentration. In vivo fluorescence (fluo), a key proxy for Chla, has become one most widely measured biogeochemical parameters in ocean. This advancement largely due to integration fluorometers onto BioGeoChemical-Argo (BGC-Argo) profiling floats, component multidisciplinary OneArgo array. By significantly expanding number fluo profiles compared historical ship-based observations,...
Oxygen, measured using optical sensors, was the first biogeochemical parameter recorded by Argo floats.  The program, now renamed OneArgo to take account of ocean's (BGC) and deep components, counts over 300,000 dissolved oxygen concentration profiles. This number profiles makes program a key player in characterizing state ocean. Among parameters on floats, endorsed International Oceanographic Commission (IOC), can be used quantify, for example, Net Community Production...