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Updated: Feb 11, 2026

Quantitating Iron Transport Across the Mouse Placenta In Vivo Using Nonradioactive Iron Isotopes
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Anthropogenic combustion iron as a complex climate forcer.

Hitoshi Matsui1,2, Natalie M Mahowald3, Nobuhiro Moteki4

  • 1Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan, 464-8601. matsui@nagoya-u.jp.

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Anthropogenic combustion iron, primarily from fossil fuels, is 8 times higher than previously estimated. This finding significantly impacts ocean biogeochemistry and climate forcing, highlighting its crucial role in the Earth system.

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Area of Science:

  • Atmospheric chemistry and aerosol science
  • Oceanography and biogeochemistry
  • Climate science

Background:

  • Atmospheric iron deposition influences ocean biogeochemistry and the global carbon cycle.
  • Anthropogenic combustion iron is traditionally considered a minor source of soluble iron compared to mineral dust and biomass burning.

Purpose of the Study:

  • To re-evaluate the atmospheric burden and deposition flux of anthropogenic combustion iron.
  • To assess the impact of anthropogenic iron on ocean biogeochemistry and radiative forcing.

Main Methods:

  • Incorporation of recent measurements of anthropogenic magnetite into a global aerosol model.
  • Quantification of atmospheric iron burden and deposition fluxes.
  • Estimation of direct radiative forcing from anthropogenic magnetite.

Main Results:

  • The atmospheric burden of anthropogenic combustion iron is estimated to be 8 times greater than previous assessments.
  • Total soluble iron deposition to southern oceans increased by 52%, with anthropogenic iron becoming a dominant source.
  • Direct radiative forcing of anthropogenic magnetite was calculated globally and regionally (East Asia).

Conclusions:

  • Anthropogenic combustion iron is a more significant climate forcer than previously recognized.
  • The revised estimates necessitate a re-evaluation of iron's role in ocean biogeochemistry and climate regulation.
  • Anthropogenic iron emissions play a key role in the Earth system, influencing both oceanic processes and climate.