Sebastien Garrigues

Scientist - Land Data Assimilation
Copernicus, CAMS Services, Coupled Assimilation

Summary:
Sebastien Garrigues is a full-time scientist in the Coupled Data Assimilation team, Earth System Assimilation section in the research department. He has 22 years of research experiences in Earth observations and land surface modelling used in various contexts (vegetation monitoring, hydrology, atmospheric composition and Numerical Weather Prediction (NWP)). He has skills in land surface modelling, Earth observations, data assimilation and machine learning. His approach relies on leveraging process-based models, Earth observations, machine learning and data assimilation to improve the representation of land surface processes for NWP and environmental predictions (atmospheric CO2, aerosol, fire, hydrology). His current research is dedicated to the implementation of vegetation variables in the control vector of the land data assimilation system of the Integrated Forecast System (IFS) developed at ECMWF to consistently constraint both the water and carbon surface fluxes over land. His main achievement concerns the development of machine learning-based observation operators to assimilate level-1 microwave observations and Solar-Induced chlorophyll Fluorescence (SIF) in the IFS surface analysis.
Professional interests:
  • Earth system science for NWP, hydrology, CO2  and atmospheric composition: 
    • Land surface: water and carbon cycles, surface-atmosphere coupling
    • Atmospheric composition: aerosol, biomass burning emission
  • Machine-learning: observation operator, land surface model emulator, parameter optimisation
  • Data assimilation: 
    • Land surface (soil moisture and vegetation): Microwave passive and active observations, Solar Induced Fluorescence, Leaf Area Index (LAI), GNSS-R.
    • Aerosol 
    • Fire 
Career background:
  • 2023-present: Scientist - Land data assimilation - Development of machine learning-based observation operator for the assimilation of level-1 microwave and Solar Induced Fluorescence (SIF) observations in the Integrated Forecast System (IFS) - CORSO and CONCERTO (leader of WP on data assimilation) horizon Europe projects - ECMWF (Coupled data assimilation team, ESAS section, RD department) 
  • 2019-2023: Scientist - Atmospheric composition - Assimilation of satellite products for aerosol and biomass burning emission monitoring- Copernicus Atmosphere Monitoring Service (CAMS) - ECMWF
  • 2018-2019:·Researcher (visiting scientist ) - Development and evaluation of a multi-source energy balance scheme in the JULES land surface model - Hydro-JULES fellow – Center for Ecology and Hydrology (CEH), Wallingford, UK
  • 2016-2018:· Researcher - Long-term evolution of evapotranspiration for Mediterranean regions : Impact of adaptations of crop managements in the context of climate change - Marie Curie/Agreenskill+ Awarded fellowship (Marie-Curie FP7 COFUND People Programme) - visiting scientist at Department of Geography and Environmental Science at the University of Reading, Reading, UK and Centre for Ecology and Hydrology (CEH), Wallingford, UK.
  • 2010-2016: Researcher (tenured position) - Impact of global changes on the long-term evolution of the water balance of Mediterranean regions: uncertainty in evapotranspiration predictions - Institut National de Recherche Agronomique (INRA, French National Agronomy Research), EMMAH (Modelling Agricultural and hydrological systems in Mediterranean environment), Avignon, France
External recognitions
  •  CEOS/WGCV/Land Product Validation group, 2005-2010 (co-chair 2008-2010)
  • CEOS/Atmospheric composition/aerosol and air quality group, 2019-2023
  • AEROSAT (International Satellite Aerosol Science Network), 2019-2023
  •  ICAP (International Cooperative for Aerosol Prediction), ECMWF point of contact, 2022-2023
  • Sentinel-3 Validation Team (S3VT) for atmospheric products, 2020-2022 
  • Sentinel-3 Optical Next Generation Ad Hoc Expert Group, 2022 -2023