Anthropogenic iron oxide aerosols enhance atmospheric heating

Nature Communications
Nobuhiro MotekiYutaka Kondo

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.

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Citations

May 11, 2018·Scientific Reports·Akinori ItoJoyce E Penner
Apr 25, 2018·Nature Communications·Hitoshi MatsuiMark G Flanner
Apr 11, 2021·The Science of the Total Environment·Haasyimah Ab RahimSumiani Yusoff
Apr 30, 2021·Environmental Geochemistry and Health·Wanda Wilczyńska-MichalikMarek Michalik

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Methods Mentioned

BETA
electron microscopy
electron
X-ray
light-scattering

Software Mentioned

LOWTRAN
libRadtran
aggregate
gen
SBDART

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