A5026432624- Oceanographic and Atmospheric Processes
- Marine and coastal ecosystems
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Ocean Acidification Effects and Responses
- Atmospheric and Environmental Gas Dynamics
- Marine Biology and Ecology Research
- Geophysics and Gravity Measurements
- Geological formations and processes
- Water Quality Monitoring and Analysis
- Geological and Geophysical Studies
- Underwater Vehicles and Communication Systems
- Isotope Analysis in Ecology
- Environmental Monitoring and Data Management
- Geological Studies and Exploration
- Tropical and Extratropical Cyclones Research
- Maritime Transport Emissions and Efficiency
- Water Quality Monitoring Technologies
- Marine and environmental studies
- Satellite Communication Systems
- Analytical Chemistry and Sensors
- Reservoir Engineering and Simulation Methods
- Ocean Waves and Remote Sensing
Centre National de la Recherche Scientifique
2016-2025
Ifremer
2016-2025
Laboratory for Ocean Physics and Satellite Remote Sensing
2016-2025
Université de Bretagne Occidentale
2016-2025
Institut de Recherche pour le Développement
2016-2025
Institut Universitaire Européen de la Mer
2016-2025
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2020-2024
Scripps Institution of Oceanography
2003-2019
University of California, San Diego
2003-2019
Institut Océanographique
2008-2012
An array of overturning data The Atlantic meridional circulation (AMOC) has a strong influence on climate, so it is important to understand how global warming may affect it. Lozier et al. report initial results from the Overturning in Subpolar North Program (OSNAP) (see Perspective by Rhein). OSNAP been measuring flux water transported high latitudes Atlantic. measurements reveal variability transport region and show that deep formation Labrador Sea not, as previously believed, be major...
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...
In the past two decades, Argo Program has collected, processed and distributed over million vertical profiles of temperature salinity from upper kilometers global ocean. A similar number subsurface velocity observations near 1000 dbar have also been collected. This paper recounts history Program, its aspiration arising out World Ocean Circulation Experiment, to development implementation instrumentation telecommunication systems, various technical problems encountered. We describe data...
Abstract The Atlantic Ocean overturning circulation is important to the climate system because it carries heat and carbon northward, from surface deep ocean. high salinity of subpolar North a prerequisite for circulation, strong freshening could herald slowdown. We show that eastern underwent extreme during 2012 2016, with magnitude never seen before in 120 years measurements. cause was unusual winter wind patterns driving major changes ocean including slowing Current diversion Arctic...
Abstract For decades oceanographers have understood the Atlantic meridional overturning circulation (AMOC) to be primarily driven by changes in production of deep-water formation subpolar and subarctic North Atlantic. Indeed, current Intergovernmental Panel on Climate Change (IPCC) projections an AMOC slowdown twenty-first century based climate models are attributed inhibition deep convection However, observational evidence for this linkage has been elusive: there no clear demonstration...
Abstract The In Situ Analysis System (ISAS) was developed to produce gridded fields of temperature and salinity that preserve as much possible the time space sampling capabilities Argo network profiling floats. Since first global reanalysis performed in 2009, system has evolved, a careful delayed-mode processing 2002–12 dataset been carried out using version 6 ISAS updating statistics ISAS13 analysis. This last is now implemented operational analysis tool at Coriolis data center. robustness...
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...
Abstract Over 1993–2016, studies have shown that the observed global mean sea level (GMSL) budget is closed within current data uncertainties. However, non‐closure of was recently reported when using Jason‐3, Argo and GRACE/GRACE Follow‐On after 2016. This may result from errors in sets used to estimate GMSL its components. Here, we investigate possible sources affecting Jason‐3 data. Comparisons trends with other altimetry missions show good agreement 0.4 mm/yr over 2016–present. Besides,...
The early twenty-first century’s warming trend of the full-depth global ocean is calculated by combining analysis Argo (top 2000 m) and repeat hydrography into a blended observing system. surface-to-bottom temperature change over last decade sustained observation equivalent to heat uptake 0.71 ± 0.09 W m −2 applied surface Earth, 90% it being found above 2000-m depth. authors decompose pointwise changes in isopycnal depth (heave) along an (spiciness) describe mechanisms controlling...
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 Using Argo floats, we show that a major deep convective activity occurred simultaneously in the Labrador Sea (LAB), south of Cape Farewell (SCF), and Irminger (IRM) during winter 2014 – 2015. Convection was driven by exceptional heat loss to atmosphere (up 50% higher than climatological mean). This is first observation convection over such widespread area. Mixed layer depths exceptionally reached 1700 m SCF 1400 IRM. The thermocline density gradient limited mixed deepening 1800 m....
Abstract Changes in the Atlantic Meridional Overturning Circulation, which have potential to drive societally-important climate impacts, traditionally been linked strength of deep water formation subpolar North Atlantic. Yet there is neither clear observational evidence nor agreement among models about how changes influence overturning. Here, we use data from a trans-basin mooring array (OSNAP—Overturning Subpolar Program) show that winter convection during 2014–2018 interior basin had...
Abstract Argo floats have significantly improved the observation of global ocean interior, but as size database increases, so does need for efficient tools to perform reliable quality control. It is shown here how classical method optimal analysis can be used validate very large datasets before operational or scientific use. The system employed one implemented at Coriolis data center produce weekly fields temperature and salinity, key are residuals. impacts various sensor errors evaluated...
Abstract Deep water formation supplies oxygen‐rich to the deep sea, spreading throughout ocean by means of global thermohaline circulation. Models suggest that dissolved gases in newly formed do not come equilibrium with atmosphere. However, direct measurements during wintertime convection are scarce, and controls over extent these disequilibria poorly quantified. Here we show that, when reached deeper than 800 m, oxygen Labrador Sea was consistently undersaturated at −6.1% −7.6% end...
Combining hydrographic data from the OVIDE (Observatoire de la Variabilité Interannuelle à Decennale/Observatory of Interannual to Decadal Variability) section (Greenland‐Portugal) with Argo and historical CTD over period 1990–2006, we estimate variability core properties a variety Subpolar Mode Water (SPMW) observed on eastern flank Reykjanes Ridge. This SPMW acquires its in winter mixed layer along side We find that February sea surface temperature ridge is proxy for temperature. The...
Abstract The international Argo program, consisting of a global array more than 3000 free-drifting profiling floats, has now been monitoring the upper 2000 m ocean for several years. One its main proposed evolutions is to be able reach deeper in order better observe and understand key role deep climate system. For this purpose, Ifremer designed new “Deep-Arvor” float: it extends current operational depth down 4000 m, measures temperature salinity up 150 cycles with CTD pumping continuously...
Abstract Using an Argo dataset and the ECCOv4 reanalysis, a volume budget was performed to address main mechanisms driving change of interior water masses in Southern Hemisphere oceans between 2006 2015. The subduction rates isopycnal diapycnal water-mass transformation were estimated density–spiciness ( σ – τ ) framework. Spiciness, defined as thermohaline variations along isopycnals, added potential density coordinates discriminate spreading on layers. positive trends found be associated...
Abstract Future changes in subduction are suspected to be critical for the ocean deoxygenation predicted by climate models over 21st century. However, drivers of global oxygen have not been fully described or quantified. Here, we address physical mechanisms responsible transport across late‐winter mixed layer base and their relation with water mass formation. Up 70% uptake takes place during Mode Water mostly Southern Ocean North Atlantic. Te driving (i) combination strong currents large...
The global mean sea-level rise is today well quantified: 1.4 ± 0.1 mm yr-1 over 1901-1993 (based on tide gauge records) and 3.0 0.2 y-1 1993-2010 satellite altimetry data). However, this not uniform large departures from the trend are observed. Given that 750 million people living in low-elevation coastal zone because will continue to due climate change, it crucial obtain reliable trends at local regional scale, design appropriate adaptation policies for future. In study,...