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




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1 Institute for Meteorology 2 TROPOS - Leibniz Institute for Tropospheric Research 3 Centre for Atmospheric Chemistry 4 MPIC - Max Planck Institute for Chemistry 5 IPA - Institute for Atmospheric Physics 6 Remote Sensing Technology Institute 7 Institute for Inhalation Biology

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. Using the measured size distributions as well as mass scattering and absorption efficiencies, Mie calculations provided mean effective refractive indices of 1.60?0.010i and 1.56?0.010i ?=0.55 ?m 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.





Author: K. Hungershöfer - K. Zeromskiene - Y. Iinuma - G. Helas - J. Trentmann - T. Trautmann - R. S. Parmar - A. Wiedensohler - M. O. A

Source: https://hal.archives-ouvertes.fr/



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