标题：Construction and Characterization of an Indoor Smog Chamber for Measuring the Optical and Physicochemical Properties of Aging Biomass Burning Aerosols
出版社：Chinese Association for Aerosol Research in Taiwan
摘要：We describe here the construction and characterization of a new combustion-chamber system (the NCAT chamber) for studying the optical and physicochemical properties of biomass burning (BB) aerosols. This system is composed of a ~9 m3 fluorinated ethylene propylene (FEP) film reactor placed in a temperature-controlled room that uses a tube furnace to combust biomass fuel samples under controlled conditions. The optical properties are measured using a cavity ring-down spectrometer and nephelometer. Aerosol number density and size classification used condensation particle counter, and differential mobility analyzer. Other analytical instruments, used include NOx, O3, CO, and CO2 analyzers, a gas chromatograph, and particle filter samples for determining the physicochemical and morphological properties. The construction details and characterization experiments are described, including measurements of the BB particulate size distribution and deposition rate, gas wall loss rates, dilution rate, light intensity, mixing speed, temperature and humidity variations, and air purification method. The wall loss rates for NO, NO2, and O3 were found to be (7.40 ± 0.01) × 10–4, (3.47 ± 0.01) × 10–4, and (5.90 ± 0.08) × 10–4 min–1, respectively. The NO2 photolysis rate constant was 0.165 ± 0.005 min–1, which corresponds to a flux of (7.72 ± 0.25) × 1017 photons nm cm–2 s–1 for 296.0–516.8 nm, and the particle deposition rate was (9.46 ± 0.18) × 10–3 min–1 for 100 nm mobility diameter BB particles from pine. Preliminary results of the single scattering albedo of fresh and aged BB aerosols are also reported.
关键词：Biomass burning aerosols;Optical properties of aerosols;Smog chamber;Single scattering albedo;Fresh and aged aerosols
