Optical Properties of Wintertime Aerosols from Residential Wood Burning in Fresno, CA: Results from DISCOVER-AQ 2013

Environmental Science & Technology
Xiaolu ZhangChristopher D Cappa

Abstract

The optical properties, composition and sources of the wintertime aerosols in the San Joaquin Valley (SJV) were characterized through measurements made in Fresno, CA during the 2013 DISCOVER-AQ campaign. PM2.5 extinction and absorption coefficients were measured at 405, 532, and 870 nm along with refractory black carbon (rBC) size distributions and concentrations. BC absorption enhancements (Eabs) were measured using two methods, a thermodenuder and mass absorption coefficient method, which agreed well. Relatively large diurnal variations in the Eabs at 405 nm were observed, likely reflecting substantial nighttime emissions of wood burning organic aerosols (OA) from local residential heating. Comparably small diurnal variations and absolute nighttime values of Eabs were observed at the other wavelengths, suggesting limited mixing-driven enhancement. Positive matrix factorization analysis of OA mass spectra from an aerosol mass spectrometer resolved two types of biomass burning OA, which appeared to have different chemical composition and absorptivity. Brown carbon (BrC) absorption was estimated to contribute up to 30% to the total absorption at 405 nm at night but was negligible (<10%) during the day. Quantitative understanding...Continue Reading

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Citations

Sep 25, 2018·Journal of Geophysical Research. Atmospheres : JGR·James T KellyJames G Walega
Sep 9, 2020·The Science of the Total Environment·Xiangrui KongJan B C Pettersson
Oct 16, 2018·Environmental Pollution·Mingjie XieMichael P Hannigan
Sep 21, 2017·Environmental Science & Technology·Mingjie XieAmara L Holder

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