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Original Research Papers

Microphysical and optical properties of dust and tropical biomass burning aerosol layers in the Cape Verde region—an overview of the airborne in situ and lidar measurements during SAMUM-2

Authors:

Bernadett Weinzierl ,

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

Ludwig-Maximilians-Universität München, Meteorologisches Institut; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, DE
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Michael Esselborn,

European Southern Observatory, Technology Division; Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, DE
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Andreas Petzold,

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

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

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

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

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

Physics Department, Leibniz Institut for Tropospheric Research (IfT), DE
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Matthias Tesche,

Physics Department, Leibniz Institut for Tropospheric Research (IfT), DE
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Silke Gross,

Ludwig-Maximilians-Universität München, Meteorologisches Institut, DE
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Volker Freudenthaler

Ludwig-Maximilians-Universität München, Meteorologisches Institut, DE
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Abstract

In the framework of the Saharan Mineral Dust Experiment (SAMUM) airborne High Spectral Resolution Lidar and in situ measurements of the particle size, aerosol mixing state and absorption coefficient were conducted. Here, the properties of mineral dust and tropical biomass burning layers in the Cape Verde region in January/February 2008 are investigated and compared with the properties of fresh dust observed in May/June 2006 close the Sahara. In the Cape Verde area, we found a complex stratification with dust layers covering the altitude range below 2 km and biomass burning layers aloft. The aerosol type of the individual layers was classified based on depolarization and lidar ratios and, in addition, on in situ measured Ångström exponents of absorption åap. The dust layers had a depth of 1.3 ± 0.4 km and showed a median å ap of 3.95. The median effective diameter D eff was 2.5 μm and the dust layers over Cape Verde yielded clear signals of aging: large particles were depleted due to gravitational settling and the accumulation mode diameter was shifted towards larger sizes as a result of coagulation. The tropical biomass layers had a depth of 2.0 ± 1.1 km and were characterized by a median å ap of 1.34. They always contained a certain amount of large dust particles and showed a median D eff of 1.1 μm and a fine mode D eff,fine of 0.33. The dust and biomass burning layers had a median aerosol optical depth (AOD) of 0.23 and 0.09, respectively. The median contributions to the AOD of the total atmospheric column below 10 km were 75 and 37%, respectively.

How to Cite: Weinzierl, B., Sauer, D., Esselborn, M., Petzold, A., Veira, A., Rose, M., Mund, S., Wirth, M., Ansmann, A., Tesche, M., Gross, S. and Freudenthaler, V., 2011. Microphysical and optical properties of dust and tropical biomass burning aerosol layers in the Cape Verde region—an overview of the airborne in situ and lidar measurements during SAMUM-2. Tellus B: Chemical and Physical Meteorology, 63(4), pp.589–618. DOI: http://doi.org/10.1111/j.1600-0889.2011.00566.x
  Published on 01 Jan 2011
 Accepted on 6 Jun 2011            Submitted on 23 Dec 2010

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