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The Advanced Along-Track Scanning Radiometer (AATSR) on board the ENVISATsatellite is used to study aerosol properties. The retrieval of aerosolproperties from satellite data is based on the optimized fit of simulated andmeasured reflectances at the top of the atmosphere (TOA). The simulations aremade using a radiative transfer model with a variety of representativeaerosol properties. The retrieval process utilizes a combination of fouraerosol components, each of which is defined by their (lognormal) sizedistribution and a complex refractive index: a weakly and a stronglyabsorbing fine-mode component, coarse mode sea salt aerosol and coarse modedesert dust aerosol). These components are externally mixed to provide theaerosol model which in turn is used to calculate the aerosol optical depth(AOD). In the AATSR aerosol retrieval algorithm, the mixing of thesecomponents is decided by minimizing the error function given by the sum ofthe differences between measured and calculated path radiances at 3–4wavelengths, where the path radiances are varied by varying the aerosolcomponent mixing ratios. The continuous variation of the fine-mode componentsallows for the continuous variation of the fine-mode aerosol absorption.Assuming that the correct aerosol model (i.e.  the correct mixing fractionsof the four components) is selected during the retrieval process, also otheraerosol properties could be computed such as the single scattering albedo(SSA). Implications of this assumption regarding the ratio of theweakly/strongly absorbing fine-mode fraction are investigated in this paperby evaluating the validity of the SSA thus obtained. The SSA is indirectlyestimated for aerosol plumes with moderate-to-high AOD resulting fromwildfires in Russia in the summer of 2010. Together with the AOD, the SSAprovides the aerosol absorbing optical depth (AAOD). The results are comparedwith AERONET data, i.e. AOD level 2.0 and SSA and AAOD inversion products.The RMSE (root mean square error) is 0.03 for SSA and 0.02 for AAOD lowerthan 0.05. The SSA is further evaluated by comparison with the SSA retrievedfrom the Ozone Monitoring Instrument (OMI). The SSA retrieved from bothinstruments show similar features, with generally lower AATSR-estimated SSAvalues over areas affected by wildfires

Indirect estimation of absorption properties for fine aerosol particles using AATSR observations: a case study of wildfires in Russia in 2010