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

Nature geoscience, 2017-03, Vol.10 (3), p.184-188 [Peer Reviewed Journal]

Copyright Nature Publishing Group Mar 2017 ;ISSN: 1752-0894 ;EISSN: 1752-0908 ;DOI: 10.1038/ngeo2901

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  • Title:
    Black-carbon absorption enhancement in the atmosphere determined by particle mixing state
  • Author: Liu, Dantong ; Whitehead, James ; Alfarra, M. Rami ; Reyes-Villegas, Ernesto ; Spracklen, Dominick V. ; Reddington, Carly L. ; Kong, Shaofei ; Williams, Paul I. ; Ting, Yu-Chieh ; Haslett, Sophie ; Taylor, Jonathan W. ; Flynn, Michael J. ; Morgan, William T. ; McFiggans, Gordon ; Coe, Hugh ; Allan, James D.
  • Is Part Of: Nature geoscience, 2017-03, Vol.10 (3), p.184-188
  • Description: 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.
  • Publisher: London: Nature Publishing Group
  • Language: English
  • Identifier: ISSN: 1752-0894
    EISSN: 1752-0908
    DOI: 10.1038/ngeo2901
  • Source: ProQuest Central
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