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Anthropogenic iron oxide aerosols enhance atmospheric heating

Author

Listed:
  • Nobuhiro Moteki

    (Graduate School of Science, The University of Tokyo)

  • Kouji Adachi

    (Meteorological Research Institute)

  • Sho Ohata

    (Graduate School of Science, The University of Tokyo)

  • Atsushi Yoshida

    (Graduate School of Science, The University of Tokyo)

  • Tomoo Harigaya

    (Graduate School of Science, The University of Tokyo)

  • Makoto Koike

    (Graduate School of Science, The University of Tokyo)

  • Yutaka Kondo

    (Arctic Environment Research Center, National Institute of Polar Research)

Abstract

Combustion-induced carbonaceous aerosols, particularly black carbon (BC) and brown carbon (BrC), have been largely considered as the only significant anthropogenic contributors to shortwave atmospheric heating. Natural iron oxide (FeOx) has been recognized as an important contributor, but the potential contribution of anthropogenic FeOx is unknown. In this study, we quantify the abundance of FeOx over East Asia through aircraft measurements using a modified single-particle soot photometer. The majority of airborne FeOx particles in the continental outflows are of anthropogenic origin in the form of aggregated magnetite nanoparticles. The shortwave absorbing powers (Pabs) attributable to FeOx and to BC are calculated on the basis of their size-resolved mass concentrations and the mean Pabs(FeOx)/Pabs(BC) ratio in the continental outflows is estimated to be at least 4–7%. We demonstrate that in addition to carbonaceous aerosols the aggregate of magnetite nanoparticles is a significant anthropogenic contributor to shortwave atmospheric heating.

Suggested Citation

  • Nobuhiro Moteki & Kouji Adachi & Sho Ohata & Atsushi Yoshida & Tomoo Harigaya & Makoto Koike & Yutaka Kondo, 2017. "Anthropogenic iron oxide aerosols enhance atmospheric heating," Nature Communications, Nature, vol. 8(1), pages 1-11, August.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms15329
    DOI: 10.1038/ncomms15329
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