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Enhanced light absorption by mixed source black and brown carbon particles in UK winter

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Author(s)

  • Shang Liu
  • Allison C. Aiken
  • Kyle Gorkowski
  • Manvendra K. Dubey
  • Christopher D. Cappa
  • Leah R. Williams
  • Scott C. Herndon
  • Paola Massoli
  • Edward C. Fortner
  • Puneet S. Chhabra
  • William A. Brooks
  • Timothy B. Onasch
  • John T. Jayne
  • Douglas R. Worsnop
  • Swarup China
  • Noopur Sharma
  • Claudio Mazzoleni
  • Lu Xu
  • Nga L. Ng
  • Dantong Liu
  • James D. Allan
  • Zoë L. Fleming
  • Claudia Mohr
  • Peter Zotter
  • Sönke Szidat
  • André S H Prévôt

Department/unit(s)

Publication details

JournalNature Communications
DatePublished - 30 Sep 2015
Volume6
Number of pages10
Pages (from-to)1-10
Original languageEnglish

Abstract

Black carbon (BC) and light-absorbing organic carbon (brown carbon, BrC) play key roles in warming the atmosphere, but the magnitude of their effects remains highly uncertain. Theoretical modelling and laboratory experiments demonstrate that coatings on BC can enhance BCâ ™ s light absorption, therefore many climate models simply assume enhanced BC absorption by a factor of â1/41.5. However, recent field observations show negligible absorption enhancement, implying models may overestimate BCâ ™ s warming. Here we report direct evidence of substantial field-measured BC absorption enhancement, with the magnitude strongly depending on BC coating amount. Increases in BC coating result from a combination of changing sources and photochemical aging processes. When the influence of BrC is accounted for, observationally constrained model calculations of the BC absorption enhancement can be reconciled with the observations. We conclude that the influence of coatings on BC absorption should be treated as a source and regionally specific parameter in climate models.

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