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| PARASOL | |
|---|---|
| Name | PARASOL |
| Mission type | Earth observation / atmospheric research |
| Operator | Centre National d'Études Spatiales |
| Cospar id | 2004-002D |
| Satcat | 28145 |
| Mission duration | 2 years (nominal) |
| Launch date | 18 December 2004 |
| Launch site | Centre spatial guyanais |
| Manufacturer | CNES |
| Mass | 100 kg (approx.) |
| Power | solar arrays |
| Instruments | POLDER (Polarization and Directionality of the Earth's Reflectances) |
| Orbit | Sun-synchronous |
PARASOL PARASOL was a French microsatellite developed by the Centre National d'Études Spatiales to study atmospheric aerosols, cloud properties, and radiative transfer. It operated as part of a multi-satellite constellation and collaborated with international programs and spacecraft to improve understanding of Earth's radiation budget and climate forcing. PARASOL's payload emphasized polarized radiometry and directional reflectance measurements, addressing questions relevant to Intergovernmental Panel on Climate Change assessments and observational campaigns led by agencies such as NASA and European Space Agency.
PARASOL was conceived within a network of French and international initiatives including projects from CNRS, Université Pierre et Marie Curie, Institut Pierre-Simon Laplace, and collaborations with Institut National des Sciences de l'Univers. The mission complemented spaceborne efforts like Aqua (satellite), Terra (satellite), CALIPSO, CloudSat, and the Envisat mission by providing polarized directional measurements that assisted retrievals made by broadband radiometers and active sensors. PARASOL's place in programs such as the A-Train and coordinated campaigns with NOAA and JAXA highlighted its role in multi-instrument synergistic observations.
PARASOL aimed to quantify aerosol optical properties, aerosol–cloud interactions, and the impact of aerosols and clouds on top-of-atmosphere radiative fluxes. Scientific objectives connected to international priorities articulated by bodies including the World Climate Research Programme, the Global Climate Observing System, and the Committee on Earth Observation Satellites. Goals included reducing uncertainties cited by the IPCC in radiative forcing estimates, improving parameterizations used in models developed at institutes such as Met Office Hadley Centre, Goddard Institute for Space Studies, and Max Planck Institute for Meteorology, and supporting field campaigns organized by groups like Scripps Institution of Oceanography and Lamont–Doherty Earth Observatory.
The primary instrument aboard PARASOL was a polarized radiometer designated POLDER (Polarization and Directionality of the Earth's Reflectances), developed by teams from CNES and the Institut Pierre-Simon Laplace. POLDER measured polarized and multi-angle reflectances in visible and near-infrared bands, enabling retrievals of aerosol size distributions, single-scattering albedo, and cloud droplet effective radius. Instrument heritage and calibration referenced technologies used on missions including POLDER on ADEOS-II and techniques validated against reference datasets from AERONET, MODIS, MISR, and lidar profiles from CALIPSO. The spacecraft bus incorporated attitude control and pointing systems compatible with Sun-synchronous orbit requirements similar to platforms from manufacturers allied with Thales Alenia Space.
PARASOL was launched on 18 December 2004 from Centre spatial guyanais aboard a Rockot/or comparable launcher in a coordinated deployment that placed it into a Sun-synchronous orbit. Its operations were managed by flight control teams at CNES mission centers and science operations facilities collaborating with partners at LMD (Laboratoire de Météorologie Dynamique), LATMOS, and other French laboratories. The mission participated in formation flying and coordinated overpasses with spacecraft in constellations like the A-Train and experimented with temporal collocation strategies employed in studies involving Terra, Aqua, and CloudSat for synergistic retrievals.
PARASOL's polarized directional measurements led to improved aerosol optical depth retrievals over bright surfaces such as deserts, where algorithms historically struggled using instruments like MODIS alone. Results informed aerosol radiative forcing estimates referenced in studies by IPCC authors and model evaluation efforts at institutions including NOAA Geophysical Fluid Dynamics Laboratory and European Centre for Medium-Range Weather Forecasts. PARASOL contributed to improved discrimination of aerosol types (urban/industrial, dust, biomass burning) alongside datasets from MISR, AERONET, and field campaigns by NASA and ESA. Cloud microphysical properties derived from POLDER enhanced understanding of cloud droplet effective radius and phase identification, supporting research by groups at University of Oxford, University of Reading, and MPI for Meteorology.
Data from PARASOL were processed through pipelines maintained by CNES and science teams at laboratories such as LOA (Laboratoire d'Optique Atmosphérique and LATMOS. Level 1 radiance and polarization products and Level 2 retrievals of aerosol and cloud properties were distributed to the scientific community and integrated into multi-mission archives used by the Global Earth Observation System of Systems and projects supported by European Space Agency data portals. Validation efforts used ground-based networks like AERONET and airborne campaigns from organizations including DLR and NASA airborne platforms.
PARASOL's legacy includes methodological advances in polarimetric remote sensing that influenced successor missions and instrument concepts such as POLDER-3 heritage, polarimetric instruments proposed for Sentinel series studies, and designs considered by NASA's aerosol and cloud polarimetry initiatives. Scientific products from PARASOL have been incorporated into long-term climate records and comparative studies with missions like MISR, MODIS, VIIRS, and CALIPSO, informing programs at IPCC and operational centers including EUMETSAT and NOAA. The mission fostered collaborations among European and international institutions that continue in subsequent satellite missions and coordinated observation campaigns.
Category:Earth observation satellites Category:French space program