Light absorption of biomass burning and vehicle emission-sourced carbonaceous aerosols of the Tibetan Plateau

Environmental Science and Pollution Research International
Zhaofu HuMika Sillanpää

Abstract

Carbonaceous aerosols over the Tibetan Plateau originate primarily from biomass burning and vehicle emissions (BB and VEs, respectively). The light absorption characteristics of these carbonaceous aerosols are closely correlated with the burning conditions and represent key factors that influence climate forcing. In this study, the light absorption characteristics of elemental carbon (EC) and water-soluble organic carbon (WSOC) in PM2.5 (fine particulate matter smaller than 2.5 μm) generated from BB and VEs were investigated over the Tibetan Plateau (TP). The results showed that the organic carbon (OC)/EC ratios from BB- and VE-sourced PM2.5 were 17.62 ± 10.19 and 1.19 ± 0.36, respectively. These values were higher than the ratios in other regions, which was primarily because of the diminished amount of oxygen over the TP. The mass absorption cross section of EC (MACEC) at 632 nm for the BB-sourced PM2.5 (6.10 ± 1.21 m2.g-1) was lower than that of the VE-sourced PM2.5 (8.10 ± 0.98 m2.g-1), indicating that the EC content of the BB-sourced PM2.5 was overestimated because of the high OC/EC ratio. The respective absorption per mass (α/ρ) values at 365 nm for the VE- and BB-sourced PM2.5 were 0.71 ± 0.17 m2.g-1 and 0.91 ± 0.18 m2.g-...Continue Reading

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Citations

Jan 16, 2020·Environmental Science and Pollution Research International·Pengfei ChenTao Pu
Oct 14, 2020·The Science of the Total Environment·Xiaorong ZhangBing Chen
Feb 23, 2020·Journal of Environmental Sciences (China)·Pengfei ChenTao Pu
Apr 8, 2021·Environmental Science & Technology·Haiyan NiUlrike Dusek
Sep 2, 2020·Environmental Science & Technology·Nethmi Y KasthuriarachchiAlex K Y Lee
Nov 9, 2021·The Science of the Total Environment·Ru-Jin HuangRenjian Zhang

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