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Comparison of Hygroscopic Properties of Fresh and Aged Rice Straw and Pine Stem Burning Particles
ILHWA SEO, Minhan Park, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 587
Working Group: Aerosol Chemistry
Abstract
The biomass burning is a major source of the fine particulate matter (PM2.5). Fine particles emitted from biomass burning can lead to adverse health effects and degradation of local and regional air quality. Those particles can also contribute to cloud formation by serving as cloud condensation nuclei (CCN). A laboratory-scale biomass burning chamber was constructed to produce fine particles by the burning of biomasses (rice straw and pine stem). For aging of the biomass burning particle, the Potential Aerosol Mass - Oxidation Flow Reactor (PAM-OFR) was used to simulate the atmospheric photochemical aging process. The biomasses were burning at the different burning phases (flaming and smoldering phase). The burning phases were classified by measuring CO and CO2 concentrations. For the determination of the hygroscopic property of size-resolved particles, the hygroscopic tandem differential mobility analyzer (H-TDMA) was used. The fresh biomass burning particles showed the higher hygroscopic growth factor (HGF) and cloud formation potential (κ) for rice straw burning particles than pine stem burning particles. The higher hygroscopicity was observed for both particles under the smoldering phase than the flaming phase. Hygroscopic property of the aged particles will be compared with that of fresh particles.