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Black-carbon absorption enhancement in the atmosphere determined by particle mixing state

Nature Geoscience volume 10, pages 184–188 (2017)Cite this article

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Abstract

Atmospheric black carbon makes an important but poorly quantified contribution to the warming of the global atmosphere. Laboratory and modelling studies have shown that the addition of non-black-carbon materials to black-carbon particles may enhance the particles’ light absorption by 50 to 60% by refracting and reflecting light. Real-world experimental evidence for this ‘lensing’ effect is scant and conflicting, showing that absorption enhancements can be less than 5% or as large as 140%. Here we present simultaneous quantifications of the composition and optical properties of individual atmospheric black-carbon particles. We show that particles with a mass ratio of non-black carbon to black carbon of less than 1.5, which is typical of fresh traffic sources, are best represented as having no absorption enhancement. In contrast, black-carbon particles with a ratio greater than 3, which is typical of biomass-burning emissions, are best described assuming optical lensing leading to an absorption enhancement. We introduce a generalized hybrid model approach for estimating scattering and absorption enhancements based on laboratory and atmospheric observations. We conclude that the occurrence of the absorption enhancement of black-carbon particles is determined by the particles’ mass ratio of non-black carbon to black carbon.

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Figure 1: Measured and modelled optical properties as a function of mass ratio.
Figure 2: BC optical properties and mass ratios from a wide range of sources.
Figure 3: Annually averaged global distributions of MR at the surface for insoluble and soluble Aitken mode aerosol modelled using GLOMAP.

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Acknowledgements

This work was supported through the UK Natural Environment Research Council (NERC) through the Com-Part (grant ref: NE/K014838/1), ClearfLo (grant ref: NE/H003150/1), MC4 (grant ref: NE/H008136/1), SAMBBA (grant refs: NE/J010073/1; NE/J009822/1), GASSP (grant refs: NE/J023515/1; NE/J024252/1) projects and a PhD studentships for S.H. (grant ref: NE/L002469/1) and J.W.T. The studentship of E.R.-V. was supported by the National Council of Science and Technology—Mexico (CONACyT; registry no: 217687). The Manchester chamber has received funding from the European Union’s Framework 7 EUROCHAMP2 Network and currently from the Horizon 2020 research and innovation programme through the EUROCHAMP-2020 Infrastructure Activity under grant agreement no. 730997.

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Author notes

  1. Shaofei Kong

    Present address: Present address: School of Environmental Studies, China University of Geosciences (Wuhan), Wuhan 430074, China,

Authors and Affiliations

  1. Centre for Atmospheric Sciences, School of Earth and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK

    Dantong Liu, James Whitehead, M. Rami Alfarra, Ernesto Reyes-Villegas, Shaofei Kong, Paul I. Williams, Yu-Chieh Ting, Sophie Haslett, Jonathan W. Taylor, Michael J. Flynn, William T. Morgan, Gordon McFiggans, Hugh Coe & James D. Allan

  2. National Centre for Atmospheric Science, Manchester M13 9PL, UK

    M. Rami Alfarra, Paul I. Williams & James D. Allan

  3. Institute for Climate and Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK

    Dominick V. Spracklen & Carly L. Reddington

  4. School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China

    Shaofei Kong

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  1. Dantong Liu
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Contributions

J.D.A., D.L., M.R.A. and G.M. designed the research; J.D.A., D.L., J.W., M.R.A., E.R.-V., S.K., J.W.T., P.I.W., Y.-C.T., M.J.F. and S.H. performed experiments; D.L., E.R.-V., J.W.T. and W.T.M. performed data analysis; D.V.S and C.L.R. performed model simulation; D.L., J.D.A., H.C., G.M. and E.R.-V. wrote the paper.

Corresponding authors

Correspondence to Dantong Liu or James D. Allan.

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The authors declare no competing financial interests.

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Liu, D., Whitehead, J., Alfarra, M. et al. Black-carbon absorption enhancement in the atmosphere determined by particle mixing state. Nature Geosci 10, 184–188 (2017). https://doi.org/10.1038/ngeo2901

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