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A global modeling study on carbonaceous aerosol microphysical characteristics and radiative effects

by S. E. Bauer, S. Menon, D. Koch, T. C. Bond, K. Tsigaridis
Atmospheric Chemistry and Physics ()
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Recently, attention has been drawn towards black carbon aerosols as a short-term climate warming mitigation candidate. However the global and regional impacts of the direct, indirect and semi-direct aerosol effects are highly un- certain, due to the complex nature of aerosol evolution and the way that mixed, aged aerosols interact with clouds and radiation. A detailed aerosol microphysical scheme, MA- TRIX, embedded within the GISS climate model is used in this study to present a quantitative assessment of the impact of microphysical processes involving black carbon, such as emission size distributions and optical properties on aerosol cloud activation and radiative effects. Our best estimate for net direct and indirect aerosol ra- diative flux change between 1750 and 2000 is 0.56W/m2. However, the direct and indirect aerosol effects are quite sen- sitive to the black and organic carbon size distribution and consequential mixing state. The net radiative flux change can vary between 0.32 to 0.75W/m2 depending on these carbonaceous particle properties at emission. Taking into account internally mixed black carbon particles let us sim- ulate correct aerosol absorption. Absorption of black car- bon aerosols is amplified by sulfate and nitrate coatings and, even more strongly, by organic coatings. Black carbon mit- igation scenarios generally showed reduced radiative flux- eswhen sources with a large proportion of black carbon, such as diesel, are reduced; however reducing sources with a larger organic carbon component as well, such as bio-fuels, does not necessarily lead to a reduction in positive radiative flux. Correspondence

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