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| Titel |
A global modeling study on carbonaceous aerosol microphysical characteristics and radiative effects |
| VerfasserIn |
S. E. Bauer, S. Menon, D. Koch, T. C. Bond, K. Tsigaridis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 15 ; Nr. 10, no. 15 (2010-08-10), S.7439-7456 |
| Datensatznummer |
250008697
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| Publikation (Nr.) |
 copernicus.org/acp-10-7439-2010.pdf |
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| Zusammenfassung |
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 uncertain, 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, MATRIX, 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 radiative flux change
between 1750 and 2000 is −0.56 W/m2. However, the direct and indirect
aerosol effects are quite sensitive to the black and organic carbon size
distribution and consequential mixing state. The net radiative flux change
can vary between −0.32 to −0.75 W/m2 depending on these carbonaceous
particle properties at emission. Taking into account internally mixed black
carbon particles let us simulate correct aerosol absorption. Absorption of
black carbon aerosols is amplified by sulfate and nitrate coatings and, even
more strongly, by organic coatings. Black carbon mitigation scenarios
generally showed reduced radiative fluxeswhen 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. |
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