References

ACPD

Atmospheric Chemistry and Physics Discussions

ACPD

1680-7375

Copernicus GmbH

Göttingen, Germany

10.5194/acpd-7-12657-2007

Modelling the optical properties of fresh biomass burning aerosol produced in a smoke chamber: results from the EFEU campaign

Hungershöfer

¹ ⁸ Zeromskiene

² ⁴ Iinuma

² Helas

³ Trentmann

⁵ Trautmann

¹ ⁶ Parmar

R. S.

³ Wiedensohler

² Andreae

M. O.

³ Schmid

³ ⁷

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

29 08 2007

7 4 12657 12686

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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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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