1. Presentation R&D in Optical Remote Sensing, Radiative Transfer
Development of advanced algorithms for ocean (water constituents), atmosphere (cloud, aerosol and gases) and continental surfaces monitoring (vegetation, land cover) from space optical sensors (ENVISAT/MERIS, MSG, MODIS...)
Customers : Space Agencies (CNES, ESA, EUMETSAT...), Space Data Processing Center/ Research Center, Europe (GMES project), Space industries (Alcatel, CLS), Regional and National Institutions (air quality)
10 people, founded in 2001, located in Lille, France
Earth Observation -

2. Example of applications using MSG/SEVIRI
Total suspended matter in the English channel at 15 min time resolution Neukermans G., K. Ruddick, E. Bernard, D. Ramon, B. Nechad, and P.-Y. Deschamps, «Mapping total suspended matter from geostationary satellites: a feasibility study with SEVIRI in the Southern North Sea», Opt. Express, 17, (2009).
Aerosol Optical Thickness, Bernard E., Ramon D., Jolivet D., Moulin C., Riedi J., Deschamps P.-Y., Nicolas J.-M. and Hagolle O., "Aerosol retrieval over land in the 635nm channel of MSG/SEVIRI sensor: a hourly and daily AOT product above Europe", In proceedings of the EUMETSAT Meteorological Satellite Conference, September 2009, Bath, England.
TSM
(mg/l)
21/09/2006 8h15-14H30 UT
Water reflectance 630 nm
Time
Earth Observation -

3. HYGEOS : observation de l'atmosphère et des surfaces
Processing satellite data
Rayonnement solaire
Atmosphere :
- Masque nuages : SMAOL
- Exploitations de produits EUMETSAT
- Épaisseur optique des aérosols: SMAOL (CNES) [Bernard et al., 2011]
- Pollution particulaire à la surface: INTERREG/ExPERPF, CERPA
- Corrections atmosphériques
- Calibration of satellite instruments
- Fog detection and nowcasting : PreViBOSS
Rayonnement
infra rouge
Surfaces:
- Couleur de l'eau (océan, côtes, ...): Polymer, ANR/GlobCoast
- Rayonnement solaire à la surface: FPx/geoland (METEOSAT7) [Elias et al., 2008]
- geoland2, FP7/ImagineS
Earth Observation -

4. HYGEOS : observation de l'atmosphère et des surfaces
Atmosphere :
- Validation de produits satellite
- Surveillance des poussières désertiques et feux de forêt [Elias et al., 2003 ; 2006]
- Production électrique, ressource solaire
- Fog and radiative budget: PreViBOSS
Processing ground-based data
Passive remote sensing of the column: radiometers
Earth Observation -

5. HYGEOS : observation of atmosphere and surface
- Aerosols and extinction of visible radiation: PreViBOSS
- Validation of air quality indicators
- Instrumental development
Processing ground-based data
- In situ sounding: visibilimeters, particle counters, particle mass
- Active remote sensing: ceilometers
Earth Observation -

6. HYGEOS : observation de l'atmosphère et des surfaces
Radiative Transfer
Data base management
Atmosphere and surface:
- Processing satellite data
- design of satellite missions
Earth Observation -

7. Application: Fog
. Evaluation of EUMETSAT/NWCSAF cloud type product
. forecasting of fog type: exploitation of EUMETSAT/NWCSAF cloud type product:
. Application of Cermak and Bendix method: SIRTA ? Dubai ?
. Improvement of Cermak and Bendix method: infra red for night, sza > 70° for high latritude winter
. Sounding of mist made of hydrated aerosols (or sounding of radiative impact of mist)
. Fog formation process: Temporal evolution of cloud cover
. Fog formation process: Impact of mist on radiative budget
. Fog dissipation process: impact of solar heating
. Forecasting of fog type: telemeter+visibilimeter for RAD and STL
. Forecasting of fog: temperature, ceilometer, wind, ...
. Fog dissipation: fog opacity modulated by aerosols and droplet size
. Fog formation process: Mist thickness ?
Earth Observation -

8. Questions:
3 types of fog observed at SIRTA:
What ensemble of predictors, acquired by operational instruments (gb+sat) ?
Exploiting existing network: ceilometer, air quality, radiometer, ... ?
What ensemble of predictors, concerning particle properties ?
New instrumentation with quantified benefits ?
What scores if we use only satellite data ?
Where are observed these fogs ? In what conditions our results are applicable ?
What observed parameters to constrain numerical modelling ?
Other types of fog: mountains, maritime, ice droplets, advective, ...
And other causes for very low visibility: pollution, smog, desert dust:
Requiring to acquire further data ?
Operational system:
What operators (airports, harbours, road traffic, solar energy suppliers, ...) ?
Association observation-based nowcasting and numerical forecasting ?
0-6 h / 3-72 h, local / continental,
Which solution ?
Earth Observation -