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| Titel |
Decreasing particle number concentrations in a warming atmosphere and implications |
| VerfasserIn |
F. Yu, G. Luo, R. P. Turco, J. A. Ogren, R. M. Yantosca |
| 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. 5 ; Nr. 12, no. 5 (2012-03-05), S.2399-2408 |
| Datensatznummer |
250010851
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| Publikation (Nr.) |
 copernicus.org/acp-12-2399-2012.pdf |
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| Zusammenfassung |
| New particle formation contributes significantly to the
number concentration of condensation nuclei (CN) as well as cloud CN (CCN),
a key factor determining aerosol indirect radiative forcing of the climate
system. Using a physics-based nucleation mechanism that is consistent with a
range of field observations of aerosol formation, it is shown that projected
increases in global temperatures could significantly inhibit new particle,
and CCN, formation rates worldwide. An analysis of CN concentrations
observed at four NOAA ESRL/GMD baseline stations since the 1970s and two
other sites since 1990s reveals long-term decreasing trends that are
consistent in sign with, but are larger in magnitude than, the predicted
temperature effects. The possible reasons for larger observed long-term CN
reductions at remote sites are discussed. The combined effects of rising
temperatures on aerosol nucleation rates and other chemical and
microphysical processes may imply substantial decreases in future
tropospheric particle abundances associated with global warming, delineating
a potentially significant feedback mechanism that increases Earth's climate
sensitivity to greenhouse gas emissions. Further research is needed to
quantify the magnitude of such a feedback process. |
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