WIT Press

Novel Aerosol Retrieval Algorithms For SCIAMACHY For Application Over Water And Land


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WIT Press


J. Kusmierczyk-Michulec & G. de Leeuw


Novel aerosol retrieval algorithms for SCIAMACHY for application over water and land J. Kusmierczyk-Michulec & G. de Leeuw TNO Physics and Electronics Laboratory, The Hague, The Netherlands Abstract Two aerosol retrieval algorithms of the Scanning Imaging Absorption SpectroMeter for Atmospheric ChartographY (SCIAMACHY) are developed for application over water and over land. The one for application over water uses IR spectral channels taking advantage of the common assumption of a black surface to obtain information about optical properties of aerosols. Next, this information is combined with data in the visible channels to benefit from the full spectral range offered by SCIAMACHY. The IR-derived aerosol properties are used as a first guess for the retrieval in the visible range where the surface properties are accounted for on the basis of the measured surface reflectance spectra. In contrast, for the retrieval of aerosol properties over land the starting point is the UV spectral range where the surface is dark. Next, the UV-derived aerosol properties are used for the retrieval in the visible and IR channels. Look-up tables were prepared for the following aerosol types: sea-salt, dust-like particles, black and organic carbon and water-soluble particles. The aerosol mixtures were constructed in such a way that the values of the resultant Ongstr*m coefficients cover the whole range of possible values as found e.g. in the AERONET databases [1].