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    Original Research Papers

    Thermal IR radiative properties of mixed mineral dust and biomass aerosol during SAMUM-2

    Authors:

    Claas H. Köhler ,

    Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Methodik der Fernerkundung, DE
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    Thomas Trautmann,

    Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Methodik der Fernerkundung, DE
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    Erwin Lindermeir,

    Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Methodik der Fernerkundung, DE
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    Willem Vreeling,

    Netherlands Institute for Space Research (SRON), NL
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    Kirsten Lieke,

    Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, DE
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    Konrad Kandler,

    Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, DE
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    Bernadett Weinzierl,

    Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, DE
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    Silke Groß,

    Ludwig-Maximilians-Universität München, Meteorologisches Institut, DE
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    Matthias Tesche,

    Leibniz-Institut für Troposphärenforschung (IfT), DE
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    Manfred Wendisch

    Universität Leipzig, Leipziger Institut für Meteorologie, DE
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    Abstract

    Ground-based high spectral resolution measurements of downwelling radiances from 800 to 1200 cm−1 were conducted between 20 January and 6 February 2008 within the scope of the SAMUM-2 field experiment. We infer the spectral signature of mixed biomass burning/mineral dust aerosols at the surface from these measurements and at top of the atmosphere from IASI observations. In a case study for a day characterized by the presence of high loads of both dust and biomass we attempt a closure with radiative transfer simulations assuming spherical particles. A detailed sensitivity analysis is performed to investigate the effect of uncertainties in the measurements ingested into the simulation on the simulated radiances. Distinct deviations between modelled and observed radiances are limited to a spectral region characterized by resonance bands in the refractive index. A comparison with results obtained during recent laboratory studies and field experiments reveals, that the deviations could be caused by the aerosol particles’ non-sphericity, although an unequivocal discrimination from measurement uncertainties is not possible. Based on radiative transfer simulations we estimate the aerosol’s direct radiative effect in the atmospheric window region to be 8 W m−2 at the surface and 1 W m−2 at top of the atmosphere.

    How to Cite: Köhler, C.H., Trautmann, T., Lindermeir, E., Vreeling, W., Lieke, K., Kandler, K., Weinzierl, B., Groß, S., Tesche, M. and Wendisch, M., 2011. Thermal IR radiative properties of mixed mineral dust and biomass aerosol during SAMUM-2. Tellus B: Chemical and Physical Meteorology, 63(4), pp.751–769. DOI: http://doi.org/10.1111/j.1600-0889.2011.00563.x
      Published on 01 Jan 2011
    Peer Reviewed
     CC BY 4.0
     Accepted on 5 May 2011            Submitted on 20 Dec 2010

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