POSTEL Downwelling Longwave Radiation
CDS THEIA-CNES
The “radiation” biogeophysical products of Postel are spatialized variables derived from optical or micro-wave sensors measurements acquired over many years at regional to global scales. The Downwelling Longwave Radiation (W.m-2) (DLR) is defined as the thermal irradiance reaching the surface in the thermal infrared spectrum (4 – 100 µm). It is determined by the radiation that originates from a shallow layer close to the surface, about one third being emitted by the lowest 10 meters and 80% by the 500-meter layer. The DLR is derived from several sensors (Meteosat, MSG) using various approaches, in the framework of the Geoland project.
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