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  • Title: Light Absorption Enhancement of Black Carbon Aerosol Constrained by Particle Morphology.
    Author: Wu Y, Cheng T, Liu D, Allan JD, Zheng L, Chen H.
    Journal: Environ Sci Technol; 2018 Jun 19; 52(12):6912-6919. PubMed ID: 29783837.
    Abstract:
    The radiative forcing of black carbon aerosol (BC) is one of the largest sources of uncertainty in climate change assessments. Contrasting results of BC absorption enhancement ( Eabs) after aging are estimated by field measurements and modeling studies, causing ambiguous parametrizations of BC solar absorption in climate models. Here we quantify Eabs using a theoretical model parametrized by the complex particle morphology of BC in different aging scales. We show that Eabs continuously increases with aging and stabilizes with a maximum of ∼3.5, suggesting that previous seemingly contrast results of Eabs can be explicitly described by BC aging with corresponding particle morphology. We also report that current climate models using Mie Core-Shell model may overestimate Eabs at a certain aging stage with a rapid rise of Eabs, which is commonly observed in the ambient. A correction coefficient for this overestimation is suggested to improve model predictions of BC climate impact.
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