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

Lieke, K. and Kandler, K. and Scheuvens, D. and Emmel, C. and von Glahn, C. and Petzold, A. and Weinzierl, B. and Veira, A. and Ebert, M. and 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, 63B, pp. 497-511. DOI: 10.1111/j.1600-0889.2011.00553.x.

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During the second Saharan Mineral Dust Experiment (SAMUM-2) field campaign, particles with geometric diameters (d) between â�¼0.1 and 25 �¼m were collected on board of the Deutsches Zentrum f�¼r 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 �¼m) 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 �¼m) 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).

Document Type:Article
Title:Particle chemical properties in the vertical column based on aircraft observations in the vicinity of Cape Verde Islands
AuthorsInstitution or Email of Authors
Lieke, K.TU Darmstadt
Kandler, K.TU Darmstadt
Scheuvens, D.TU Darmstadt
Emmel, C.Johannes-Gutenberg-Univ Mainz
von Glahn, C.Johannes-Gutenberg-Univ Mainz
Petzold, A.DLR
Weinzierl, B.DLR
Veira, A.DLR
Ebert, M.TU Darmstadt
Weinbruch, S.TU Darmstadt
Schütz, L.Johannes-Gutenberg-Univ Mainz
Journal or Publication Title:Tellus B - Chemical and Physical Meteorology
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 497-511
Keywords:SAMUM-2, Falcon, biomass-burning aerosol, mineral dust
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics, Transport
HGF - Program Themes:Earth Observation, ATM and Operation, Transport System
DLR - Research area:Raumfahrt, Aeronautics, Transport
DLR - Program:R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation, V VS - Verkehrssystem
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, L - Climate, Weather and Environment, V - Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:01 Aug 2011 12:43
Last Modified:12 Dec 2013 21:20

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