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

Hungershoefer, Katja and Zeromskiene, Kristina and Iinuma, Yoshiteru and Helas, Guenter and Trentmann, Joerg and Trautmann, Thomas and Parmar, Ravindra Singh and Wiedensohler, Alfred and Andreae, Meinrat O. and Schmid, Otmar (2007) Modelling the optical properties of fresh biomass burning aerosol produced in a smoke chamber: results from the EFEU campaign. Atmospheric Chemistry and Physics, 8, pp. 3427-3439.

Full text not available from this repository.

Official URL: http://www.atmos-chem-phys.net/8/3427/2008/

Abstract

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. The combustion conditions were monitored with concomitant CO2 and CO measurements. The mass scattering efficiencies of 8.9±0.2m<sup>2</sup>g<sup>−1</sup> and 9.3±0.3m<sup>2</sup> g<sup>−1</sup> obtained for aerosol particles from the combustion of savanna grass and an African hardwood (musasa), respectively, are larger than typically reported mainly due to differences in particle size distribution. The photoacoustically measured mass absorption efficiencies of 0.51±0.02m<sup>2</sup> g<sup>−1</sup> and 0.50±0.02m<sup>2</sup> g<sup>−</sup>1 were at the lower end of the literature values. Using the measured size distributions as well as the mass scattering and absorption efficiencies, Mie calculations provided effective refractive indices of 1.60−0.010i (savanna grass) and 1.56−0.010i (musasa) (λ=0.55μm). The apparent discrepancy between the low imaginary part of the refractive index and the high apparent elemental carbon (ECa) fractions (8 to 15%) obtained from the thermographic analysis of impactor samples can be explained by a positive bias in the elemental carbon data due to the presence of high molecular weight organic substances. Potential artefacts in optical properties due to instrument bias, non-natural burning conditions and unrealistic dilution history of the laboratory smoke cannot be ruled out and are also discussed in this study.

Document Type:Article
Title:Modelling the optical properties of fresh biomass burning aerosol produced in a smoke chamber: results from the EFEU campaign
Authors:
AuthorsInstitution or Email of Authors
Hungershoefer, KatjaInstitute for Meteorology, University of Leipzig, Leipzig, Germany
Zeromskiene, KristinaLeibniz-Institute for Tropospheric Research, Leipzig, Germany
Iinuma, YoshiteruLeibniz-Institute for Tropospheric Research, Leipzig, Germany
Helas, GuenterMax Planck Institute for Chemistry, Biogeochemistry Dept., Mainz, Germany
Trentmann, JoergInstitute for Atmospheric Physics, Johannes Gutenberg University Mainz, Mainz, Germany
Trautmann, ThomasUNSPECIFIED
Parmar, Ravindra SinghMax Planck Institute for Chemistry, Biogeochemistry Dept., Mainz, Germany
Wiedensohler, AlfredLeibniz-Institute for Tropospheric Research, Leipzig, Germany
Andreae, Meinrat O.Max Planck Institute for Chemistry, Biogeochemistry Dept., Mainz, Germany
Schmid, OtmarInstitute for Inhalation Biology, GSF-National Research Centre for Environment and Health, Neuherberg, Germany
Date:30 July 2007
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:8
Page Range:pp. 3427-3439
Status:Published
Keywords:Biomass burning aerosol, number size distribution, optical properties, complex refractive index, Mie simulations
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 Entwicklung von Atmosphärenprozessoren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > Atmospheric Processors
Deposited By: Prof.Dr. Thomas Trautmann
Deposited On:30 Sep 2008
Last Modified:15 Jan 2010 00:05

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