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DOI: 10.1615/ICHMT.2010.RAD-6.450
pages 30-32

Mirjam Blum
Institute of Environmental Physics, University of Bremen, Germany and Helmholtz University Young Investigators Group PHYTOOPTICS

Vladimir Rozanov
Institute of Environmental Physics University of Bremen, German

Tilman Dinter
Institute of Environmental Physics University of Bremen; and Helmholtz University Young Investigators Group PHYTOOPTICS; and Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany

Astrid Bracher
Institute of Environmental Physics University of Bremen; and Helmholtz University Young Investigators Group PHYTOOPTICS; and Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany


To date, the software package SCIATRAN [V. V. Rozanov et al., 2002; A. Rozanov et al., 2005, 2008] has been used for modelling radiative processes in the atmosphere for the retrieval of trace gases from satellite data from the satellite sensor SCIAMACHY (Scanning Imaging Absorption Spectrometer for Atmospheric CHartographY onboard the satellite ENVISAT). This SCIATRAN version only accounted for radiative transfer within the atmosphere and reflection of light at the earth surface. However, radiation also passes the air-water interface, proceeds within the water and is modified by the water itself and the water constituents. Therefore, SCIATRAN has been extended by oceanic radiative transfer and coupling it to the atmospheric radiative transfer model under the terms of established models for radiative transfer underwater [Kopelevich, 1983; Morel et al., 1974, 2001; Shifrin, 1988; Buitevald et al., 1994; Cox and Munk, 1954a, 1954b; Breon and Henriot, 2006; Mobley, 1994] and extending the data bases to include the specific properties of the water constituents [Pope and Fry, 1997; Haltrin, 2006; Prieur and Sathyendranath, 1981].
So far, the coupling for the scalar radiative transfer is included. To analyze the quality of this new scalar coupled ocean-atmosphere radiative transfer version of SCIATRAN, model results of this and of the uncoupled SCIATRAN version are compared to observations, using satellite and in-situ measurements. In particular, we compared MERIS-TOA (top of the atmosphere) reflectances with SCIATRAN calculations. The data were chosen due to varying chlorophyll concentrations at different sites during different seasons. The main input parameters required to model the measured data properly, such as concentrations of water vapor, ozone, chlorophyll, aerosol optical thickness as well as observation and illumination geometry, are taken from the MERIS satellite and AERONET data base measurements and used in the same way for both versions. Each version takes the optical properties of organic and inorganic small (phytoplankton, bacteria, dust etc. < 1 μm) and large (phytoplankton, zooplankton, sand etc. >/= 1 μm) particles measured by in-situ observations into account. Furthermore, in the coupled version the single scattering albedo and the extinction coefficient can be set. Nevertheless, these two properties of water particles have a non-neglecting impact on the modelled result, but they are not often measured and not available from the MERIS satellite data at all. Therefore, common values based on theory and own tests are used.

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