Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-4225-2010 http://www.atmos-chem-phys-discuss.net/10/4225/2010/ http://www.atmos-chem-phys-discuss.net/10/4225/2010/acpd-10-4225-2010.html http://www.atmos-chem-phys-discuss.net/10/4225/2010/acpd-10-4225-2010.pdf 4225 4269 2010-02-12 Measured and modeled humidification factors of fresh smoke particles from biomass burning: role of inorganic constituents J. L. Hand hand@cira.colostate.edu D. E. Day G. M. McMeeking E. J. T. Levin C. M. Carrico S. M. Kreidenweis W. C. Malm A. Laskin Y. Desyaterik Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, USA Department of Atmospheric Science, Colorado State University, Fort Collins, CO, USA National Park Service, Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, USA William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, USA now at: Center for Atmospheric Science, University of Manchester, Manchester, UK During the 2006 FLAME study (<B>F</B>ire <B>L</B>aboratory <B>a</B>t <B>M</B>issoula <B>E</B>xperiment), laboratory burns of biomass fuels were performed to investigate the physico-chemical, optical, and hygroscopic properties of fresh biomass smoke. As part of the experiment, two nephelometers simultaneously measured dry and humidified light scattering coefficients (<I>b</I>_sp(dry) and <I>b</I>_sp(RH), respectively) in order to explore the role of relative humidity (RH) on the optical properties of biomass smoke aerosols. Results from burns of several biomass fuels showed large variability in the humidification factor (<I>f</I>(RH)=<I>b</I>_sp(RH)/<I>b</I>_sp(dry)). Values of <I>f</I>(RH) at RH=85–90% ranged from 1.02 to 2.15 depending on fuel type. We incorporated measured chemical composition and size distribution data to model the smoke hygroscopic growth to investigate the role of inorganic and organic compounds on water uptake for these aerosols. By assuming only inorganic constituents were hygroscopic, we were able to model the water uptake within experimental uncertainty, suggesting that inorganic species were responsible for most of the hygroscopic growth. In addition, humidification factors at 85–90% RH increased for smoke with increasing inorganic salt to carbon ratios. Particle morphology as observed from scanning electron microscopy revealed that samples of hygroscopic particles contained soot chains either internally or externally mixed with inorganic potassium salts, while samples of weak to non-hygroscopic particles were dominated by soot and organic constituents. 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