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| Titel |
No statistically significant effect of a short-term decrease in the nucleation rate on atmospheric aerosols |
| VerfasserIn |
E. M. Dunne, L. A. Lee, C. L. Reddington, K. S. Carslaw |
| 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 ; 12, no. 23 ; Nr. 12, no. 23 (2012-12-04), S.11573-11587 |
| Datensatznummer |
250011647
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| Publikation (Nr.) |
 copernicus.org/acp-12-11573-2012.pdf |
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| Zusammenfassung |
| Observed correlations between short-term decreases in cosmic ray ionisation
and cloud and aerosol properties have been attributed to short-term decreases
in the ion-induced nucleation rate. We use a global aerosol microphysics
model to determine whether a 10 day reduction of 15% in the nucleation
rate could generate a statistically significant response in aerosol
concentrations and optical properties. As an upper limit to the possible
effect of changes in ion-induced nucleation rate, we perturb the total
nucleation rate, which has been shown to generate particle concentrations and
nucleation events in reasonable agreement with global observations. When
measured against a known aerosol control state, the model predicts a 0.15%
decrease in global mean cloud condensation nucleus concentration at the
surface. However, taking into account the variability in aerosol, no
statistically significant response can be detected in concentrations of
particles with diameters larger than 10 nm, in cloud condensation nuclei
with diameters larger than 70 nm, or in the Ångström exponent. The
results suggest that the observed correlation between short-term decreases in
cosmic ray ionisation and cloud and aerosol properties cannot be explained by
associated changes in the large-scale nucleation rate. |
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