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Perturbation of the European free troposphere aerosol by North American forest fire plumes during the ICARTT-ITOP Experiment in summer 2004

Petzold, A. and Weinzierl, Bernadett and Huntrieser, H. and Stohl, A. and Real, E. and Cozic, J. and Fiebig, M. and Hendricks, J. and Lauer, A. and Law, K. and Roiger, A. and Schlager, H. and Weingartner, E. (2007) Perturbation of the European free troposphere aerosol by North American forest fire plumes during the ICARTT-ITOP Experiment in summer 2004. Atmospheric Chemistry and Physics, 7, pp. 5105-5127.

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Official URL: http://www.atmos-chem-phys.net/7/5105/2007/


During the ICARTT-ITOP Experiment in summer 2004 plumes from large wildfires in North America were transported to Central Europe at 3–8 km altitude above sea level (a.s.l.). These plumes were studied with the DLR (Deutsches Zentrum fuer Luft- und Raumfahrt) research aircraft Falcon which was equipped with an extensive set of in situ aerosol and trace gas instruments. Analyses by the Lagrangian dispersion model FLEXPART provided source regions, transport times and horizontal extent of the fire plumes. Results from the general circulation model ECHAM/MADE and data from previous aerosol studies over Central Europe provided reference vertical profiles of black carbon (BC) mass concentrations for year 2000 conditions with forest fire activities below the long-term average. Smoke plume observations yielded a BC mass fraction of total aerosol mass with respect to PM2.5 of 3–10%. The ratio of BC mass to excess CO was 3–7.5 mg BC (g CO)<sup>-1</sup>. Even after up to 10 days of atmospheric transport, both characteristic properties were of the same order as for fresh emissions. This suggests an efficient lifting of BC from forest fires to higher altitudes with only minor scavenging removal of particulate matter. Maximum aerosol absorption coefficient values were 7–8×10<sup>-6</sup>m<sup>-1</sup> which is about two orders of magnitude above the average European free tropospheric background value. Forest fire aerosol size distributions were characterised by a strong internally mixed accumulation mode centred at modal diameters of 0.25–0.30 μm with an average distribution width of 1.30. Nucleation and small Aitken mode particles were almost completely depleted. Even after more than one week of atmospheric transport, no steady state of the size distribution was observed.

Document Type:Article
Title:Perturbation of the European free troposphere aerosol by North American forest fire plumes during the ICARTT-ITOP Experiment in summer 2004
AuthorsInstitution or Email of Authors
Weinzierl, BernadettUNSPECIFIED
Stohl, A.NILU, Kjeller, N
Real, E.Univ. Pierre et Marie Curie, Paris Cedex 05, F
Cozic, J.Paul Scherrer Inst., Villigen PSI, CH
Law, K.Univ. Pierre et Marie Curie, Paris Cedex 05, F
Weingartner, E.Paul Scherrer Inst., Villigen PSI, CH
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 5105-5127
Keywords:ITOP 2004, aged forest fire areosol, size distribution, black carbon, long-range transport
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:11 Sep 2007
Last Modified:20 Oct 2014 14:32

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