Fabrice Hernández
A5040742323- Oceanographic and Atmospheric Processes
- Climate variability and models
- Marine and coastal ecosystems
- Geophysics and Gravity Measurements
- Meteorological Phenomena and Simulations
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
- Arctic and Antarctic ice dynamics
- Marine and fisheries research
- Atmospheric and Environmental Gas Dynamics
- Advanced Computational Techniques and Applications
- Reservoir Engineering and Simulation Methods
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Cryospheric studies and observations
- Geological and Geophysical Studies
- Ocean Acidification Effects and Responses
- Atmospheric Ozone and Climate
- Environmental Monitoring and Data Management
- Precipitation Measurement and Analysis
- Ionosphere and magnetosphere dynamics
- Underwater Vehicles and Communication Systems
- Soil Moisture and Remote Sensing
- Global Energy Security and Policy
- Inertial Sensor and Navigation
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2015-2025
Institut de Recherche pour le Développement
2015-2025
Peruvian University of Applied Sciences
2024
Université de Toulouse
2022-2023
Centre National de la Recherche Scientifique
2019-2023
Mercator Ocean (France)
2008-2023
Centre National d'Études Spatiales
2023
Université Toulouse III - Paul Sabatier
2022-2023
Universidade Federal de Pernambuco
2019-2023
Ifremer
2019
The lack of an accurate geoid still prevents precise computation the ocean absolute dynamic topography from satellite altimetry and only sea level anomalies (SLA) can be accurately deduced. In new context Global Ocean Data Assimilation Experiment (GODAE) where models are assimilating altimetry, estimation a realistic mean (MDT) consistent with SLA is crucial issue. first “direct” approach, MDT computed by subtracting model EIGEN‐2 Mean Sea Surface Height CLS01, determined 7 years altimetric...
The Pilot Research Moored Array in the tropical Atlantic (PIRATA) was developed as a multinational observation network to improve our knowledge and understanding of ocean-atmosphere variability Atlantic. PIRATA motivated by fundamental scientific issues societal needs for improved prediction climate its impact on economies West Africa, northeastern Brazil, Indies, United States. In this paper implementation is described, noteworthy accomplishments are highlighted, future framework...
Uncertainty in ocean analysis methods and deficiencies the observing system are major obstacles for reliable reconstruction of past climate. The variety existing reanalyses is exploited a multi-reanalysis ensemble to improve state estimation gauge uncertainty levels. ensemble-based signal-to-noise ratio allows identification characteristics which robust (such as tropical mixed-layer-depth, upper heat content), where large exists (deep ocean, Southern Ocean, sea ice thickness, salinity),...
The Copernicus Marine Environment Monitoring Service (CMEMS) provides regular and systematic reference information on the physical biogeochemical ocean sea-ice state for global European regional seas. CMEMS serves a wide range of users (more than 15,000 are now registered to service) applications. Observations fundamental pillar value-added chain that goes from observation users. used by Thematic Assembly Centres (TACs) derive high-level data products Forecasting (MFCs) validate constrain...
Introduction — s1 Chapter 1: Essential Variables s4 1.1 Ocean temperature and salinity Sandrine Mulet, Bruno Buongiorno Nardelli, Simon Good, Andrea Pisano, Eric Greiner, Maeva Monier, Emmanuel...
The Copernicus Marine Environment Monitoring Service (CMEMS) Ocean State Report (OSR) provides an annual report of the state global ocean and European regional seas for policy decision-makers with additional aim increasing general public awareness about status of, changes in, marine environment. CMEMS OSR draws on expert analysis a 3-D view (through reanalysis systems), from above remote-sensing data) direct interior in situ measurements) seas. is based unique monitoring capabilities blue...
Ocean reanalyses combine ocean models, atmospheric forcing fluxes, and observations using data assimilation to give a four-dimensional description of the ocean. Metrics assessing their reliability have improved over time, allowing become an important tool in climate services that provide more complete picture changing end users. Besides monitoring research, are used initialize sub-seasonal multi-annual predictions, support observational network monitoring, evaluate model simulations. These...
Accurate knowledge of the location and magnitude ocean heat content (OHC) variability change is essential for understanding processes that govern decadal variations in surface temperature, quantifying changes planetary energy budget, developing constraints on transient climate response to external forcings. We present an overview temporal spatial characteristics OHC as represented by ensemble dynamical statistical reanalyses (ORAs). Spatial maps 0–300 m layer show large regions Pacific...
Sixteen monthly air–sea heat flux products from global ocean/coupled reanalyses are compared over 1993–2009 as part of the Ocean Reanalysis Intercomparison Project (ORA-IP). Objectives include assessing closure, consistency temporal variability, comparison with other products, and documenting errors against in situ measurements at a number OceanSITES moorings. The ensemble 16 ORA-IP estimates has positive bias 4.2 ± 1.1 W m−2. Residual gain (i.e., surface + assimilation increments) is...
Abstract Prediction and Research Moored Array in the Tropical Atlantic (PIRATA) is a multinational program initiated 1997 tropical to improve our understanding ability predict ocean‐atmosphere variability. PIRATA consists of network moored buoys providing meteorological oceanographic data transmitted real time address fundamental scientific questions as well societal needs. The maintained through dedicated yearly cruises, which allow for extensive complementary shipboard measurements provide...
Merging Geosat Follow-On (GFO) with TOPEX/Poseidon (TP) and ERS-2 altimeter data has the potential to improve mapping of sea level ocean circulation variations. This can be achieved, however, only if measurement errors inconsistencies between different missions are sufficiently reduced. In this paper, it is shown how get consistent surface heights from three using most precise mission as a reference. A new technique then used estimate GFO mean profile. allows anomalies (SLAs) extracted GFO,...
The Mercator-Océan eddy permitting (1/4) global ocean forecasting system assimilating satellite altimetry is the French contribution to GODAE project and MERSEA for operational systems. It has run operationally since October 2005 forced with daily surface fluxes from ECMWF analyses forecasts. JASON, ERS GFO measurements AVISO were assimilated January up real time. simulation results are compared independent in-situ data of Atlantic, Pacific Antarctic Ocean basins in order provide an...
Operational ocean forecast systems provide routine marine products to an ever-widening community of users and stakeholders. The majority need information about the quality reliability exploit them fully. Hence, centres have been developing improved methods for evaluating communicating their products. Global Ocean Data Assimilation Experiment (GODAE) OceanView, along with Copernicus European Marine Core Service other national international programmes, has facilitated development coordinated...
As part of the work GODAE OceanView Inter-comparison and Validation Task Team (IV-TT), 6 global ocean forecasting systems spread across 5 operational oceanography forecast centres were inter-compared using a common set observations as proxy for truth. The 'Class 4' in title refers to verification metrics defined MERSEA-IP/GODAE internal document (CitationHernandez 2007), defining feature which is that comparisons between forecasts take place observation space. This approach seen departure...
Operational oceanography can be described as the provision of routine oceanographic information needed for decision-making purposes. It is dependent upon sustained research and development through end-to-end framework an operational service, from observation collection to delivery mechanisms. The core components systems are a multi-platform network, data management system, assimilative prediction dissemination/accessibility system. These interdependent, necessitating communication exchange...
The tropical Atlantic is home to multiple coupled climate variations covering a wide range of timescales and impacting societally relevant phenomena such as continental rainfall, hurricane activity, oceanic biological productivity, atmospheric circulation in the equatorial Pacific. also connects southern northern branches meridional overturning receives freshwater input from some world's largest rivers. To address these diverse, unique, interconnected research challenges, rich network ocean...
We investigate the wind‐driven current response over world ocean using SVP drifting buoys, ERS‐1 and ERS‐2, TOPEX altimetry data ECMWF wind stress fields. Wind‐driven ageostrophic currents are estimated from buoys by removing deduced geostrophic observed velocities. Removing signal enhances coherence with at periods longer than 10 days. For superinertial lower 20 days, a two‐parameter (i.e., angle amplitude) model is fitted to isolated study upper surface in that frequency band. The model,...
Abstract : During the Global Ocean Data Assimilation Experiment (GODAE), seven international operational centers participated in a dedicated modeling system intercomparison exercise from February to April 2008. The objectives were: (1) show GODAE global-ocean and basin-scale forecasting systems of different countries routine interaction continuous operation, (2) assess quality perform scientific validation ocean analyses performance each system, (3) learn this order increase interoperability...