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Source Quantification of South Asian Black Carbon Aerosols with Isotopes and Modeling

Dasari, S and Andersson, A and Stohl, A and Evangeliou, N and Holmstrand, H and Budhavant, K and Salam, A and Gustafsson, � (2020) Source Quantification of South Asian Black Carbon Aerosols with Isotopes and Modeling. In: Environmental Science and Technology, 54 (19). pp. 11771-11779.

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Official URL: https://doi.org/10.1021/acs.est.0c02193


Black carbon (BC) aerosols perturb climate and impoverish air quality/human health - affecting ?1.5 billion people in South Asia. However, the lack of source-diagnostic observations of BC is hindering the evaluation of uncertain bottom-up emission inventories (EIs) and thereby also models/policies. Here, we present dual-isotope-based (?14C/?13C) fingerprinting of wintertime BC at two receptor sites of the continental outflow. Our results show a remarkable similarity in contributions of biomass and fossil combustion, both from the site capturing the highly populated highly polluted Indo-Gangetic Plain footprint (IGP; ?14C-fbiomass = 50 ± 3) and the second site in the N. Indian Ocean representing a wider South Asian footprint (52 ± 6). Yet, both sites reflect distinct ?13C-fingerprints, indicating a distinguishable contribution of C4-biomass burning from peninsular India (PI). Tailored-model-predicted season-averaged BC concentrations (700 ± 440 ng m-3) match observations (740 ± 250 ng m-3), however, unveiling a systematically increasing model-observation bias (+19 to -53) through winter. Inclusion of BC from open burning alone does not reconcile predictions (fbiomass = 44 ± 8) with observations. Direct source-segregated comparison reveals regional offsets in anthropogenic emission fluxes in EIs, overestimated fossil-BC in the IGP, and underestimated biomass-BC in PI, which contributes to the model-observation bias. This ground-truthing pinpoints uncertainties in BC emission sources, which benefit both climate/air-quality modeling and mitigation policies in South Asia. Copyright © 2020 American Chemical Society.

Item Type: Journal Article
Publication: Environmental Science and Technology
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to The Author(s).
Keywords: Aerosols; Air quality; Biomass; Carbon; Fog; Isotopes, Anthropogenic emissions; Black carbon aerosol; Continental outflow; Emission inventories; Indo-Gangetic Plains; Mitigation policies; Source diagnostics; Source quantification, Uncertainty analysis, black carbon; carbon 14; coal; isotope; organic carbon; carbon; isotope, aerosol; air quality; atmospheric modeling; atmospheric pollution; black carbon; carbon isotope; concentration (composition); source identification, aerosol; air pollution; air quality; Article; biomass; carbon footprint; combustion; fossil; India; Indian Ocean; isotope analysis; warming; winter; aerosol; air pollutant; Asia; environmental monitoring; human; season, Aerosols; Air Pollutants; Asia; Carbon; Environmental Monitoring; Humans; Indian Ocean; Isotopes; Seasons
Department/Centre: Division of Mechanical Sciences > Divecha Centre for Climate Change
Date Deposited: 11 Jan 2023 06:41
Last Modified: 11 Jan 2023 06:41
URI: https://eprints.iisc.ac.in/id/eprint/79045

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