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Improvement of the FRESCO cloud algorithm for GOME and SCIAMACHY

Ping Wang(1), Piet Stammes(2) and Nicolas Fournier(3)

(1) Royal Netherlands Meteorological Institute (KNMI), Wilhelminalaan 10 , NL-3732 GK De Bilt , Netherlands
(2) Royal Netherlands Meteorological Institute (KNMI), Wilhelminalaan 10 , NL-3732 GK De Bilt, Netherlands
(3) Royal Netherlands Meteorological Institute (KNMI), Wilhelminalaan 10, NL-3732 GK De Bilt , Netherlands

Abstract

FRESCO (Fast Fast Retrieval Scheme for Clouds from the Oxygen A-band ) has been successfully used in GOME and SCIAMACHY cloud retrieval for several years. It simulates the measured reflectance at TOA at 15 wavelength at about 758, 761, 765 nm. In FRESCO only O2 absorption is considered until now. The reflectances are pre-calculated, and stored as a look up table. The FRESCO products are used in the cloud correction of trace gas retrievals from GOME and SCIAMACHY measurements. In the new version of FRESCO algorithm, single Rayleigh scattering is added in the reflectance database and the retrieval. The new reflectance database has been compared with DAK model (Double Adding KNMI) simulation. We have tested the new FRESCO algorithm with simulation and real measurements. The new FRESCO version is important for less cloudy pixels.

 

Full paper

Keywords: ESA European Space Agency - Agence spatiale europeenne, observation de la terre, earth observation, satellite remote sensing, teledetection, geophysique, altimetrie, radar, chimique atmospherique, geophysics, altimetry, radar, atmospheric chemistry