Measurement report: quantifying source contribution of fossil fuels and biomass-burning black carbon aerosol in the southeastern margin of the Tibetan Plateau

Liu, Huikun; Wang, Qiyuan; Xing, Li; Zhang, Yong; Zhang, Ting; Ran, Weikang; Cao, Junji

Anthropogenic emissions of black carbon (BC) aerosol are transported from Southeast Asia to the southwestern Tibetan Plateau (TP) during the pre-monsoon; however, the quantities of BC from different anthropogenic sources and the transport mechanisms are still not well constrained because there have been no high-time-resolution BC source apportionments. Intensive measurements were taken in a transport channel for pollutants from Southeast Asia to the southeastern margin of the TP during the pre-monsoon to investigate the influences of fossil fuels and biomass burning on BC. A receptor model that coupled multi-wavelength absorption with aerosol species concentrations was used to retrieve site-specific Ångström exponents (AAEs) and mass absorption cross sections (MACs) for BC. An “aethalometer model” that used those values showed that biomass burning had a larger contribution to BC mass than fossil fuels (BCinline-formulabiomass=57 % versus BCinline-formulafossil=43 %). The potential source contribution function indicated that BCinline-formulabiomass was transported to the site from northeastern India and northern Burma. The Weather Research and Forecasting model coupled with chemistry (WRF-Chem) indicated that 40 % of BCinline-formulabiomass originated from Southeast Asia, while the high BCinline-formulafossil was transported from the southwest of the sampling site. A radiative transfer model indicated that the average atmospheric direct radiative effect (DRE) of BC was inline-formula+4.6 inline-formula± 2.4 W minline-formula−2, with inline-formula+2.5 inline-formula± 1.8 W minline-formula−2 from BCinline-formulabiomass and inline-formula+2.1 inline-formula± 0.9 W minline-formula−2 from BCinline-formulafossil. The DRE of BCinline-formulabiomass and BCinline-formulafossil produced heating rates of 0.07 inline-formula± 0.05 and 0.06 inline-formula± 0.02 K dinline-formula−1, respectively. This study provides insights into sources of BC over a transport channel to the southeastern TP and the influence of the cross-border transportation of biomass-burning emissions from Southeast Asia during the pre-monsoon.

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Liu, Huikun / Wang, Qiyuan / Xing, Li / et al: Measurement report: quantifying source contribution of fossil fuels and biomass-burning black carbon aerosol in the southeastern margin of the Tibetan Plateau. 2021. Copernicus Publications.

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