Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-3627-2010 http://www.atmos-chem-phys-discuss.net/10/3627/2010/ http://www.atmos-chem-phys-discuss.net/10/3627/2010/acpd-10-3627-2010.html http://www.atmos-chem-phys-discuss.net/10/3627/2010/acpd-10-3627-2010.pdf 3627 3658 2010-02-09 Water uptake and chemical composition of fresh aerosols generated in open burning of biomass C. M. Carrico carrico@lamar.colostate.edu M. D. Petters S. M. Kreidenweis A. P. Sullivan G. R. McMeeking E. J. T. Levin W. C. Malm J. L. Collett Jr. Department of Atmospheric Science, Colorado State University, Ft. Collins, CO 80523, USA Cooperative Institute for Research of the Atmosphere/National Park Service, Colorado State University, Ft. Collins, CO 80523, USA now at: Department of Marine, Earth, and Atmospheric Sciences, Campus Box 8208, North Carolina State University, Raleigh, NC 27695-8208, USA now at: Center for Atmospheric Science, University of Manchester, Manchester, UK As part of the Fire Lab at Missoula Experiments (FLAME) in 2006–2007, we examined hygroscopic properties of particles emitted from open combustion of 33 select biomass fuels. Measurements of humidification growth factors for subsaturated water relative humidity (RH) conditions were made with a hygroscopic tandem differential mobility analyzer (HTDMA) for dry particle diameters of 50, 100 and 250 nm. Results were then fit to a single-parameter model to obtain the hygroscopicity parameter, κ. Particles in freshly emitted biomass smoke exhibited a wide range of hygroscopicity (individual modes with 0<κ<1.0), spanning a range from the hygroscopicity of fresh diesel soot emissions to that of pure inorganic salts commonly found in the ambient aerosol. Smoke aerosols dominated by carbonaceous species typically had a unimodal growth factor with corresponding mean κ=0.1 (range of 0<κ<0.4). Those with a substantial inorganic mass fraction typically separated into less- and more-hygroscopic modes at high RH, the latter with mean κ=0.4 (range of 0.1<κ<1). The bimodal κ distributions were indicative of smoke chemical heterogeneity at a single particle size, whereas heterogeneity as a function of size was indicated by typically decreasing κ values with increasing dry particle diameters. Hygroscopicity varied strongly with biomass fuel type and, to a lesser extent, with combustion conditions. 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