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Original Research Papers

Particle chemical properties in the vertical column based on aircraft observations in the vicinity of Cape Verde Islands

Authors:

K. Lieke ,

Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, DE
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K. Kandler,

Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, DE
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D. Scheuvens,

Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt; Institut für Physik der Atmosphäre, Johannes-Gutenberg-Universität Mainz, DE
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C. Emmel,

Institut für Physik der Atmosphäre, Johannes-Gutenberg-Universität Mainz, DE
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C. Von Glahn,

Institut für Physik der Atmosphäre, Johannes-Gutenberg-Universität Mainz, DE
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A. Petzold,

Institut für Physik der Atmosphäre, Deutsches Zentrum für Luftund Raumfahrt, DE
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B. Weinzierl,

Institut für Physik der Atmosphäre, Deutsches Zentrum für Luftund Raumfahrt, DE
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A. Veira,

Institut für Physik der Atmosphäre, Deutsches Zentrum für Luftund Raumfahrt, DE
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M. Ebert,

Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, DE
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S. Weinbruch,

Institut für Angewandte Geowissenschaften, Technische Universität Darmstadt, DE
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L. Schütz

Institut für Physik der Atmosphäre, Johannes-Gutenberg-Universität Mainz, DE
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Abstract

During the second Saharan Mineral Dust Experiment (SAMUM-2) field campaign, particles with geometric diameters (d) between ∼0.1 and 25 μm were collected on board of the Deutsches Zentrum f¨ur Luft- und Raumfahrt (German Aerospace Center, DLR) Falcon aircraft. Size, chemical composition and mixing state of aerosols sampled (spatially and vertically resolved) along theWest African coastline and in the Cape Verde Islands region were determined by electron microscopy. A pronounced layer structure of biomass-burning aerosol and desert dust was present for all days during the sampling period from 23 January to 6 February. The aerosol composition of the small particles (d < 0.5 μm) was highly variable and in cases of biomass burning strongly dominated by soot with up to 90% relative number abundance. Internal mixtures of soot particles with mineral dust were not detected. Soot was only observed to mix with secondary sulphate. The coarse particles (d > 0.5 μm) were dominated by silicates. In the Cape Verde Islands region mineral dust is well mixed. The determination of source regions by elemental or mineralogical composition was generally not possible, except for air masses which were transported over the Gulf of Guinea. The real part of the refractive index showed little variation. In contrast, the imaginary part strongly depended on the abundance of soot (biomass-burning aerosol) and haematite (mineral dust).

How to Cite: Lieke, K., Kandler, K., Scheuvens, D., Emmel, C., Von Glahn, C., Petzold, A., Weinzierl, B., Veira, A., Ebert, M., Weinbruch, S. and Schütz, L., 2011. Particle chemical properties in the vertical column based on aircraft observations in the vicinity of Cape Verde Islands. Tellus B: Chemical and Physical Meteorology, 63(4), pp.497–511. DOI: http://doi.org/10.1111/j.1600-0889.2011.00553.x
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  Published on 01 Jan 2011
 Accepted on 9 May 2011            Submitted on 20 Nov 2010

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