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| Titel |
Scheme for calculation of multi-layer cloudiness and precipitation for climate models of intermediate complexity |
| VerfasserIn |
A. V. Eliseev, D. Coumou, A. V. Chernokulsky, V. Petoukhov, S. Petri |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 5 ; Nr. 6, no. 5 (2013-10-23), S.1745-1765 |
| Datensatznummer |
250085005
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| Publikation (Nr.) |
 copernicus.org/gmd-6-1745-2013.pdf |
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| Zusammenfassung |
| In this study we present a scheme for calculating the characteristics of
multi-layer cloudiness and precipitation for Earth system models of
intermediate complexity (EMICs). This scheme considers three-layer stratiform
cloudiness and single-column convective clouds. It distinguishes between ice
and droplet clouds as well. Precipitation is calculated by using cloud
lifetime, which depends on cloud type and phase as well as on statistics of
synoptic and convective disturbances. The scheme is tuned to observations by
using an ensemble simulation forced by the ERA-40-derived climatology for
1979–2001. Upon calibration, the scheme realistically reproduces basic
features of fields of cloud fractions, cloud water path, and precipitation.
The simulated globally and annually averaged total cloud fraction is 0.59,
and the simulated globally averaged annual precipitation is
100 cm yr−1. Both values agree with empirically derived values. The
simulated cloud water path is too small, probably because the simulated
vertical extent of stratiform clouds is too small. Geographical distribution
and seasonal changes of calculated cloud fraction and precipitation are
broadly realistic as well. However, some important regional biases still
remain in the scheme, e.g. too little precipitation in the tropics. We
discuss possibilities for future improvements in the scheme. |
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