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10.5194/acpd-7-12657-2007
http://www.atmos-chem-phys-discuss.net/7/12657/2007/
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http://www.atmos-chem-phys-discuss.net/7/12657/2007/acpd-7-12657-2007.pdf
12657
12686
2007-08-29
Modelling the optical properties of fresh biomass burning aerosol produced in a smoke chamber: results from the EFEU campaign
K. Hungershöfer
hungershoefer@lisa.univ-paris12.fr
K. Zeromskiene
Y. Iinuma
G. Helas
J. Trentmann
T. Trautmann
R. S. Parmar
A. Wiedensohler
M. O. Andreae
O. Schmid
Institute for Meteorology, University of Leipzig, Leipzig, Germany
Leibniz-Institute for Tropospheric Research, Leipzig, Germany
Max Planck Institute for Chemistry, Biogeochemistry Dept., Mainz, Germany
Centre for Atmospheric Chemistry, York University, Toronto, Canada
Institute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
Remote Sensing Technology Institute, German Aerospace Centre, Wessling, Germany
Institute for Inhalation Biology, GSF-National Research Centre for Environment and Health, Neuherberg, Germany
now at: Laboratoire Inter-Universitaire des Systèmes Atmosphériques (LISA), Université Paris 7/12 and CNRS (UMR 7583), Créteil, France
A better characterisation of the optical properties of biomass
burning aerosol as a function of the burning conditions is required
in order to quantify their effects on climate and
atmospheric chemistry. Controlled laboratory combustion experiments with different fuel
types were carried out at the combustion facility of the Max Planck
Institute for Chemistry (Mainz, Germany) as part of the 'Impact of
Vegetation Fires on the Composition and Circulation of the
Atmosphere' (EFEU) project. Using the measured size distributions as
well as mass scattering and absorption efficiencies, Mie calculations
provided mean effective refractive indices of 1.60−0.010<i>i</i> and
1.56−0.010<i>i</i> (λ=0.55 μm) for smoke particles emitted from
the combustion of savanna grass and an African hardwood (musasa),
respectively. The relatively low imaginary parts suggest that the
light-absorbing carbon of the investigated fresh biomass burning
aerosol is only partly graphitized, resulting in strongly scattering
and less absorbing particles. While the observed variability in
mass scattering efficiencies was consistent with changes in particle
size, the changes in the mass absorption efficiency can only be
explained, if the chemical composition of the particles varies with
combustion conditions.
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