ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-6179-2010 Measured and modeled humidification factors of fresh smoke particles from biomass burning: role of inorganic constituents Hand J. L. 1 Day D. E. 1 McMeeking G. M. 2 5 Levin E. J. T. 2 Carrico C. M. 2 Kreidenweis S. M. 2 Malm W. C. 3 Laskin A. 4 Desyaterik Y. 2 4 Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, Colorado, USA Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA National Park Service, Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, Colorado, USA William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland Washington, USA now at: Center for Atmospheric Science, University of Manchester, Manchester, UK 09 07 2010 10 13 6179 6194 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. This article is available from http://www.atmos-chem-phys.net/10/6179/2010/acp-10-6179-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/6179/2010/acp-10-6179-2010.pdf

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><sub>sp(dry) </sub> and <i>b</i><sub>sp(RH)</sub>, 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 from the west and southeast United States showed large variability in the humidification factor (<i>f</i>(RH)=<i>b</i><sub>sp(RH)</sub>/<i>b</i><sub>sp(dry)</sub>). Values of <i>f</i>(RH) at RH=80–85% ranged from 0.99 to 1.81 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 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 80–85% 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. This study provides further understanding of the compounds responsible for water uptake by young biomass smoke, and is important for accurately assessing the role of smoke in climate change studies and visibility regulatory efforts.

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