Abstract ID 4.035, 2018 joint 14th iCACGP Quadrennial Symposium and 15th IGAC Science Conference, Takamatsu, Kagawa, 25-29 September 201

ITO, Akinori

LIN, Guangxing

PENNER, Joyce E.

伊藤, 彰記

JAMSTEC Repository

Aerosol radiative forcing of pyrogenetic iron oxides Akinori Ito1*, Guangxing Lin2, and Joyce E. Penner3 1Research Institute for Global Change, JAMSTEC, Yokohama, Kanagawa, 236-0001, Japan. 2Pacific Northwest National Laboratory, Richland, WA, USA. 3Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, Michigan, USA. *e-mail: akinorii@jamstec.go.jp  Combustion aerosols affect the climate by absorbing and scattering radiation. Iron (Fe) oxides emitted from pyrogenetic sources largely reside in supermicron aerosols. Fe oxides on aerosols are known to absorb sun light and heat the atmosphere. However, supermicron aerosols from pyrogenetic sources are ignored for radiative forcing in climate models. Here, we use a global chemical transport model and a radiative transfer model to estimate the radiative forcing of Fe oxides from pyrogenetic sources. The model results suggest that Fe oxides from pyrogenetic sources significantly contribute to a warming effect at the top of the atmosphere over the air polluted regions in East Asia as well as biomass burning source regions. However, the estimates strongly depend on chemical speciation of Fe oxides. These nanoparticles are also important as bioavailable Fe for human health and external nutrient input to marine ecosystems. Our results highlight the need for improving the process-based understanding of the effects of emission sources and chemical transformation on both the optical properties and bioavailability. Since a rapid growth in energy consumption of iron and steel industry in upcoming developing countries is projected in the next decades, this is especially crucial for assessing the future impact of air quality changes on climate and ecosystems. 

Aerosol radiative forcing of pyrogenetic iron oxides

http://www.jamstec.go.jp/jdb/ronbun/Ks00055644.pdf

Aerosol radiative forcing of pyrogenetic iron oxides

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