2020
DOI: 10.1021/acs.est.0c02193
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Source Quantification of South Asian Black Carbon Aerosols with Isotopes and Modeling

Abstract: 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 (Δ 14 C/δ 13 C) fingerprinting of wintertime BC at two receptor sites of the continental outflow. Our results show a remarkable similar… Show more

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Cited by 38 publications
(73 citation statements)
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“… 42 , 43 Hence, in addition to fossil fuel combustion and C3 biomass burning, C4 biomass burning is a plausible primary source in the context of South Asian continental emissions of CO, as has also been recently shown for incomplete combustion-derived black carbon aerosols investigated at the same site. 36 Taken together, based on the observed sharp positive trend in δ 13 C and δ 18 O during polluted air mass regime, we hypothesize that formation of CO is likely driven by a combination of primary sources. For further source-diagnostics the source signatures representative of the dominant air mass regimes is investigated.…”
Section: Resultssupporting
confidence: 55%
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“… 42 , 43 Hence, in addition to fossil fuel combustion and C3 biomass burning, C4 biomass burning is a plausible primary source in the context of South Asian continental emissions of CO, as has also been recently shown for incomplete combustion-derived black carbon aerosols investigated at the same site. 36 Taken together, based on the observed sharp positive trend in δ 13 C and δ 18 O during polluted air mass regime, we hypothesize that formation of CO is likely driven by a combination of primary sources. For further source-diagnostics the source signatures representative of the dominant air mass regimes is investigated.…”
Section: Resultssupporting
confidence: 55%
“…34 , 35 Hence, sampling at the Maldives Climate Observatory at Hanimaadhoo (MCOH; Figure 1 a), located downwind of the continent during winter, allows to intercept and fingerprint the sources as well as trace the geographical emission regions contributing to the CO transported from the continent to the North Indian Ocean. 36 …”
Section: Resultsmentioning
confidence: 99%
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