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| Titel |
The contribution of plume-scale nucleation to global and regional aerosol and CCN concentrations: evaluation and sensitivity to emissions changes |
| VerfasserIn |
R. G. Stevens, J. R. Pierce |
| 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 ; 14, no. 24 ; Nr. 14, no. 24 (2014-12-20), S.13661-13679 |
| Datensatznummer |
250119259
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| Publikation (Nr.) |
 copernicus.org/acp-14-13661-2014.pdf |
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| Zusammenfassung |
| We implement the Predicting Particles Produced in Power-Plant Plumes (P6)
sub-grid sulphate parameterization for the first time into a global chemical-transport
model with online aerosol microphysics, the GEOS-Chem-TOMAS model. Compared
to simulations using two other previous treatments of sub-grid sulphate,
simulations using P6 sub-grid sulphate predicted similar or smaller increases
(depending on other model assumptions) in globally, annually averaged concentrations
of particles larger than 80 nm (N80). We test in simulations using
P6 sub-grid sulphate the sensitivity of particle number concentrations to changes
in SO2 or NOx emissions to represent recent emissions control changes.
For global increases of 50% in emissions of either SO2 or NOx,
or both SO2 and NOx, we find that globally, annually averaged
N80 increase by 9.00, 1.47, or 10.24% respectively.
However, both sub-grid and grid-resolved processes contribute to these
changes. Finally, we compare the model results against observations of particle number concentrations.
Compared with previous treatments of sub-grid sulphate, use of the P6 parameterization
generally improves correlation with observed particle number concentrations.
The P6 parameterization is able to resolve spatial heterogeneity in new-particle
formation and growth that cannot be resolved by any constant assumptions
about sub-grid sulphate. However, the differences in annually averaged aerosol
size distributions due to the treatment of sub-grid sulphate at the measurement
sites examined here are too small to unambiguously establish P6 as providing
better agreement with observations. |
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