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- W2024697205 abstract "The FRESCO (Fast Retrieval Scheme for Clouds from the Oxygen A-band) algorithm has been success-fully used in GOME and SCIAMACHY cloud retrieval for several years. It simulates the measured reflectance at TOA at 15 wavelengths at about 758, 761, and 765 nm. The reflectances are pre-calculated, and stored as a look-up-table. The FRESCO products are effective cloud fraction and cloud pressure, which are used in the cloud correction of trace gas retrievals from GOME and SCIAMACHY. Until now only O<sub>2</sub> absorption has been considered in FRESCO. In the new version of the FRESCO algorithm, called FRESCO+, single Rayleigh scattering is added in the reflectance database and the retrieval. Rayleigh scattering is mainly important for the cloud free part of the pixels. The new reflectance database has been tested with DAK (Doubling Adding KNMI) multiple scattering simulations of the O<sub>2</sub> A-band. Applied to GOME data, FRESCO+ gives a global average effective cloud fraction which is about 0.01 larger and a cloud pressure which is about 57 hPa higher than the current FRESCO version. The cloud pressure changes are largest for the less cloudy pixels. The FRESCO+ cloud height has been compared with ground-based cloud observations from the SGP/ARM site." @default.
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- W2024697205 date "2006-09-29" @default.
- W2024697205 modified "2023-09-23" @default.
- W2024697205 title "Test and first validation of FRESCO+" @default.
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- W2024697205 doi "https://doi.org/10.1117/12.687901" @default.
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