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| Titel |
Impact of parametric uncertainties on the present-day climate and on the anthropogenic aerosol effect |
| VerfasserIn |
U. Lohmann, S. Ferrachat |
| 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. 23 ; Nr. 10, no. 23 (2010-12-01), S.11373-11383 |
| Datensatznummer |
250008927
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| Publikation (Nr.) |
 copernicus.org/acp-10-11373-2010.pdf |
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| Zusammenfassung |
| Clouds constitute a large uncertainty in global
climate modeling and climate change projections as many clouds are
smaller than the size of a model grid box. Some processes, such as the
rates of rain and snow formation that have a large impact on climate,
cannot be observed. The uncertain parameters in the representation of
these processes are therefore adjusted in order to achieve radiation
balance. Here we systematically investigate the impact of key
tunable parameters within the convective and stratiform cloud schemes
and of the ice cloud optical properties on the present-day climate in
terms of clouds, radiation and precipitation. The total anthropogenic
aerosol effect between pre-industrial and present-day times amounts to
−1.00 W m−2 obtained as an average over all simulations as
compared to −1.02 W m−2 from those simulations where the
global annual mean top-of-the atmosphere radiation balance is within
±1 W m−2. Thus tuning of the present-day climate does not
seem to have an influence on the total anthropogenic aerosol effect.
The parametric uncertainty regarding the above mentioned cloud
parameters has an uncertainty range of 25% between the minimum and
maximum value when taking all simulations into account. It is reduced
to 11% when only the simulations with a balanced top-of-the
atmosphere radiation are considered. |
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