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| Titel |
Variable CCN formation potential of regional sulfur emissions |
| VerfasserIn |
P. T. Manktelow, K. S. Carslaw, G. W. Mann, D. V. Spracklen |
| 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 ; 9, no. 10 ; Nr. 9, no. 10 (2009-05-20), S.3253-3259 |
| Datensatznummer |
250007299
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| Publikation (Nr.) |
 copernicus.org/acp-9-3253-2009.pdf |
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| Zusammenfassung |
| Aerosols are short lived so their geographical distribution and impact on
climate depends on where they are emitted. Previous model studies have shown
that the mass of sulfate aerosol produced per unit sulfur emission (the
sulfate burden potential) and the associated direct radiative forcing vary
regionally because of differences in meteorology and photochemistry. Using a
global model of aerosol microphysics, we show that the total number of
aerosol particles produced per unit sulfur emission (the aerosol number
potential) has a different regional variation to that of sulfate mass. The
aerosol number potential of N. American and Asian emissions is calculated to
be a factor of 3 to 4 times greater than that of European emissions, even
though Europe has a higher sulfate burden potential. Pollution from N. America and Asia tends to reach higher altitudes than European pollution so
forms more new particles through nucleation. Regional differences in
particle production and growth mean that sulfur emissions from N. America and E. Asia
produce 50 nm diameter cloud condensation nuclei up to 70% more efficiently than
Europe. For 80 nm diameter CCN, N. America and Europe produce CCN 2.5 times more efficiently than E. Asia.
The impact of regional sulfur emissions on particle
concentrations is also much more widely spread than the impact on sulfate
mass, due to efficient particle production in the free troposphere during
long range transport. These results imply that regional sulfur emissions
will have different climate forcing potentials through changes in cloud drop
number. |
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