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Smoke particle emissions from the combustion of biomass fuels typical forthe western and southeastern United States were studied and compared underhigh humidity and ambient conditions in the laboratory. The fuels used wereMontana ponderosa pine (Pinus ponderosa), southern California chamise(Adenostoma fasciculatum), and Florida sawpalmetto (Serenoa repens). Information on the non-refractory chemical composition ofbiomass burning aerosol from each fuel was obtained with an aerosol massspectrometer and through estimation of the black carbon concentration fromlight absorption measurements at 870 nm. Changes in the optical and physicalparticle properties under high humidity conditions were observed forhygroscopic smoke particles containing substantial inorganic mass fractionsthat were emitted from combustion of chamise and palmetto fuels. Lightscattering cross sections increased under high humidity for these particles,consistent with the hygroscopic growth measured for 100 nm particles inHTDMA measurements. Photoacoustic measurements of aerosol light absorptioncoefficients revealed a 20% reduction with increasing relative humidity,contrary to the expectation of light absorption enhancement by the liquidcoating taken up by hygroscopic particles. This reduction is hypothesized toarise from two mechanisms: (1) shielding of inner monomers after particleconsolidation or collapse with water uptake; (2) the lower case contribution of masstransfer through evaporation and condensation at high relative humidity (RH) tothe usual heat transfer pathway for energy release by laser-heated particlesin the photoacoustic measurement of aerosol light absorption. The masstransfer contribution is used to evaluate the fraction of aerosol surfacecovered with liquid water solution as a function of RH

atmospheric chemistry and physics

Reduction in biomass burning aerosol light absorption upon humidification: roles of inorganically-induced hygroscopicity, particle collapse, and photoacoustic heat and mass transfer