Project Description
Automatized Atmospheric Absorption Atlas
4A/OP, a fast & accurate operational forward radiative transfer model.
4A/OP is a user-friendly radiative transfer model for various scientific applications, co-developed by NOVLETIS and Laboratoire de Meteorologie Dynamique, with the support of the French Space Agency.
4A/OP rely on line-by-line radiative transfer modelling for the computation of atmospheric transmittances, radiances and Jacobians, particularly efficient in terms of accuracy and computation time. It computes the optical thickness due to gaseous absorption for each atmospheric layer considered to be spherical. Its output is the radiance spectrum in a user-defined spectral domain in the infrared region.
4AO/OP is the reference radiative transfer model selected by CNES for several satellite missions: IASI, IASI-NG, MicroCarb et MERLIN. It is also used for other international satellite missions like GOSAT, SEVIRI… and for ground-based measurements (TCCON…).
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Automatized Atmospheric Absorption Atlas
4A/OP, a fast & accurate operational forward radiative transfer model.
Project details
4A/OP is a user-friendly radiative transfer model for various scientific applications, co-developed by NOVLETIS and Laboratoire de Meteorologie Dynamique, with the support of the French Space Agency.
4A/OP rely on line-by-line radiative transfer modelling for the computation of atmospheric transmittances, radiances and Jacobians, particularly efficient in terms of accuracy and computation time. It computes the optical thickness due to gaseous absorption for each atmospheric layer considered to be spherical. Its output is the radiance spectrum in a user-defined spectral domain in the infrared region.
4AO/OP is the reference radiative transfer model selected by CNES for several satellite missions: IASI, IASI-NG, MicroCarb et MERLIN. It is also used for other international satellite missions like GOSAT, SEVIRI… and for ground-based measurements (TCCON…).
Results
Elaboration of a unique fast and accurate model with the following features:
- Wide spectral domain: from 600 to 14000 cm-1
- High spectral resolution: nominal spectral sampling may be as high as 5.10-4 cm-1
- Atmospheric species: more than 50 molecules for Earth atmosphere, including isotopologues
- Many types of surface: spectral emissibity, albedos, BRDF/BPDF
- Solar contribution: any available solar spectrum, including the Doppler shift of solar lines
- Scattering: by molecules, aerosols and clouds
- Polarization
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