Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 22 2009 10.5194/acp-9-8949-2009 http://www.atmos-chem-phys.net/9/8949/2009/ http://www.atmos-chem-phys.net/9/8949/2009/acp-9-8949-2009.html http://www.atmos-chem-phys.net/9/8949/2009/acp-9-8949-2009.pdf 8949 8966 2009-11-27 Reduction in biomass burning aerosol light absorption upon humidification: roles of inorganically-induced hygroscopicity, particle collapse, and photoacoustic heat and mass transfer K. A. Lewis kmalewis@gmail.com W. P. Arnott H. Moosmüller R. K. Chakrabarty C. M. Carrico S. M. Kreidenweis D. E. Day W. C. Malm A. Laskin J. L. Jimenez I. M. Ulbrich J. A. Huffman T. B. Onasch A. Trimborn L. Liu M. I. Mishchenko Department of Physics, University of Nevada, Reno, NV 89557, USA Division of Atmospheric Sciences, Desert Research Institute, Nevada, System of Higher Education, Reno, NV 89512, USA 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 William R. Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA Department of Chemistry and Biochemistry and Cooperative Institute for Research in the Environmental Sciences (CIRES), University of Colorado at Boulder, Boulder, CO 80309, USA Aerodyne Research Inc., Center of Aerosol and Cloud Chemistry, Billerica, Massachusetts 01821, USA NASA Goddard Institute for Space Studies, New York, NY 10025, USA now at: Max Planck Institute for Chemistry, Mainz, Germany Smoke particle emissions from the combustion of biomass fuels typical for the western and southeastern United States were studied and compared under high humidity and ambient conditions in the laboratory. The fuels used were Montana ponderosa pine (<i>Pinus ponderosa</i>), southern California chamise (<i>Adenostoma fasciculatum</i>), and Florida saw palmetto (<i>Serenoa repens</i>). Information on the non-refractory chemical composition of biomass burning aerosol from each fuel was obtained with an aerosol mass spectrometer and through estimation of the black carbon concentration from light absorption measurements at 870 nm. Changes in the optical and physical particle properties under high humidity conditions were observed for hygroscopic smoke particles containing substantial inorganic mass fractions that were emitted from combustion of chamise and palmetto fuels. Light scattering cross sections increased under high humidity for these particles, consistent with the hygroscopic growth measured for 100 nm particles in HTDMA measurements. 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