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    Original Research Papers

    In-situ airborne observations of the microphysical properties of the Arctic tropospheric aerosol during late spring and summer

    Authors:

    Ann-Christine Engvall ,

    Department of Meteorology, Stockholm University, Stockholm, 106 91, Stockholm, SE
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    Radovan Krejci,

    Department of Meteorology, Stockholm University, Stockholm, 106 91, Stockholm, SE
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    Johan Ström,

    Department of Applied Environmental Science – Atmospheric Science Unit, University of Stockholm, Stockholm, 106 91, Stockholm, SE
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    Andreas Minikin,

    Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, 82234 Weßling, DE
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    Renate Treffeisen,

    Alfred-Wegener-Institut für Polar- und Meeresforschung, Telegrafenberg A43, 14473 Potsdam, DE
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    Andreas Stohl,

    Norwegian Institute for Air Research, Instituttveien 18, 2027 Kjeller, NO
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    Andreas Herber

    Alfred-Wegener-Institut für Polar- und Meeresforschung, Am Handelshafen 12, 27570 Bremerhaven, DE
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    Abstract

    In-situ aerosol data collected in the Arctic troposphere during a three-week period in 2004 were analysed. The measurements took place during late spring, i.e., at the time of the year when the characteristics of the aerosol distribution change from being accumulation-mode dominated to being primarily of the Aitken-mode type, a process that previously has been observed in the boundary layer. To address the question whether this transition is also detectable in the free troposphere of an aircraft-measured data from the ASTAR 2004 campaign were analysed. In this study, we present vertically as well as temporally results from both ground-based and airborne measurements of the total number concentrations of particles larger than 10 and 260 nm. Aircraft-measured size distributions of the aerosol ranging from 20 to 2200 nm have been evaluated with regard to conditions in the boundary layer as well as in the free troposphere. Furthermore an analysis of the volatile fraction of the aerosol population has been performed both for the integrated and size-distributed results. From these investigations we find that the transition takes place in the entire troposphere.

    How to Cite: Engvall, A.-C., Krejci, R., Ström, J., Minikin, A., Treffeisen, R., Stohl, A. and Herber, A., 2008. In-situ airborne observations of the microphysical properties of the Arctic tropospheric aerosol during late spring and summer. Tellus B: Chemical and Physical Meteorology, 60(3), pp.392–404. DOI: http://doi.org/10.1111/j.1600-0889.2008.00348.x
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      Published on 01 Jan 2008
    Peer Reviewed
     CC BY 4.0
     Accepted on 22 Feb 2008            Submitted on 1 Oct 2007

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