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| Titel |
Cloud radiative forcing intercomparison between fully coupled CMIP5 models and CERES satellite data |
| VerfasserIn |
M. Calisto, D. Folini, M. Wild, L. Bengtsson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 32, no. 7 ; Nr. 32, no. 7 (2014-07-17), S.793-807 |
| Datensatznummer |
250121081
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| Publikation (Nr.) |
 copernicus.org/angeo-32-793-2014.pdf |
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| Zusammenfassung |
| In this paper, radiative fluxes for 10 years from 11 models participating in the Coupled
Model Intercomparison Project Phase 5 (CMIP5) and from CERES satellite
observations have been analyzed and compared. Under present-day
conditions, the majority of the investigated CMIP5 models show a tendency
towards a too-negative global mean net cloud radiative forcing (NetCRF) as
compared to CERES. A separate inspection of the long-wave and shortwave
contribution (LWCRF and SWCRF) as well as cloud cover points to different
shortcomings in different models. Models with a similar NetCRF still differ
in their SWCRF and LWCRF and/or cloud cover. Zonal means mostly show
excessive SWCRF (too much cooling) in the tropics between 20° S and
20° N and in the midlatitudes between 40 to 60° S. Most of
the models show a too-small/too-weak LWCRF (too little warming) in the subtropics
(20 to 40° S and N). Difference maps between CERES and the models
identify the tropical Pacific Ocean as an area of major discrepancies in both
SWCRF and LWCRF. The summer hemisphere is found to pose a bigger challenge
for the SWCRF than the winter hemisphere.
The results suggest error compensation to occur between LWCRF and SWCRF, but
also when taking zonal and/or annual means. Uncertainties in the cloud
radiative forcing are thus still present in current models used in CMIP5. |
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