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    Original Research Papers

    Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements

    Authors:

    Matthias Tesche ,

    Leibniz Institute for Tropospheric Research (IfT), DE; now at Department of Environmental Science (ITM), Stockholm University, SE
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    Detlef Müller,

    Leibniz Institute for Tropospheric Research (IfT), DE; Atmospheric Remote Sensing Laboratory, Gwangju Institute of Science and Technology, KR
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    Silke Gross,

    Meteorological Institute, Ludwig–Maximilians–Universität; Institute of Atmospheric Physics, German Aerospace Center (DLR), DE
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    Albert Ansmann,

    Leibniz Institute for Tropospheric Research (IfT), DE
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    Dietrich Althausen,

    Leibniz Institute for Tropospheric Research (IfT), DE
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    Volker Freudenthaler,

    Meteorological Institute, Ludwig–Maximilians–Universität, DE
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    Bernadett Weinzierl,

    now at Institute for Atmospheric Physics, German Aerospace Center (DLR), DE
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    Andreas Veira,

    now at Institute for Atmospheric Physics, German Aerospace Center (DLR), DE
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    Andreas Petzold

    now at Institute for Atmospheric Physics, German Aerospace Center (DLR), DE
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    Abstract

    Lidar measurements of mixed dust/smoke plumes over the tropical Atlantic ocean were carried out during the winter campaign of SAMUM-2 at Cape Verde. Profiles of backscatter and extinction coefficients, lidar ratios, and Ångstr¨om exponents related to pure biomass-burning aerosol from southern West Africa were extracted from these observations. Furthermore, these findings were used as input for an inversion algorithm to retrieve microphysical properties of pure smoke. Seven measurement days were found suitable for the procedure of aerosol-type separation and successive inversion of optical data that describe biomass-burning smoke. We inferred high smoke lidar ratios of 87 ± 17 sr at 355 nm and 79 ± 17 sr at 532 nm. Smoke lidar ratios and Ångström exponents are higher compared to the ones for the dust/smoke mixture. These numbers indicate higher absorption and smaller sizes for pure smoke particles compared to the dust/smoke mixture. Inversion of the smoke data set results in mean effective radii of 0.22 ± 0.08 μm with individual results varying between 0.10 and 0.36 μm. The single-scattering albedo for pure biomass-burning smoke was found to vary between 0.63 and 0.89 with a very low mean value of 0.75 ± 0.07. This is in good agreement with findings of airborne in situ measurements which showed values of 0.77 ± 0.03. Effective radii from the inversion were similar to the ones found for the fine mode of the in situ size distributions.

    How to Cite: Tesche, M., Müller, D., Gross, S., Ansmann, A., Althausen, D., Freudenthaler, V., Weinzierl, B., Veira, A. and Petzold, A., 2011. Optical and microphysical properties of smoke over Cape Verde inferred from multiwavelength lidar measurements. Tellus B: Chemical and Physical Meteorology, 63(4), pp.677–694. DOI: http://doi.org/10.1111/j.1600-0889.2011.00549.x
      Published on 01 Jan 2011
    Peer Reviewed
     CC BY 4.0
     Accepted on 13 May 2011            Submitted on 31 Oct 2010

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