Seasonal Distributions and Stable Carbon Isotope Ratios of Water-Soluble Diacids, Oxoacids, and α-Dicarbonyls in Aerosols from Sapporo: Influence of Biogenic Volatile Organic Compounds and Photochemical Aging

作者：Pavuluri, Chandra Mouli^*; Kawamura, Kimitaka; Fu, Pingqing

来源：ACS Earth and Space Chemistry, 2018, 2(12): 1220-1230.

DOI：10.1021/acsearthspacechem.8b00105

• Diacids
• stable carbon isotope ratios
• biogenic emissions
• photochemical processing
• Northeast Asia

To better understand the origins and photochemical processing of organic aerosols over Northeast Asia, we studied diacids, oxoacids, and alpha-dicarbonyls and their stable carbon isotope ratios (delta C-13) in atmospheric aerosols collected at Sapporo, Japan. Molecular distributions of diacids and related compounds were characterized by a predominance of oxalic acid (C-2) followed by malonic (C-3), glyoxylic (omega C-2) and succinic (C-4) acids. Saturated normal diacids (C-2 - C-11, excluding C-6) and long-chain oxoacids (omega C-7-omega C-9) showed a seasonal pattern; gradually decreased from autumn to winter and then increased through spring with a peak in early summer. Short-chain oxoacids and alpha-dicarbonyls and delta C-13 of all species including diacids did not show a seasonal pattern. C-13 was enriched in saturated normal diacids with a decrease in carbon numbers. Short-chain oxoacids and glyoxal were more enriched with C-13 than C-2 diacid. Our results together with organic tracers demonstrate that seasonal distributions are driven by enhanced biogenic emissions and photochemical processing in spring/summer. In contrast, the contributions from biomass burning and fossil fuel combustion were higher in autumn and winter. This study provides the insights to modify the atmospheric chemical transport models by the inclusion of season specific biogenic emissions.

• 出版日期2018-12
• 单位天津大学