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| Titel |
Background albedo dynamics improve simulated precipitation variability in the Sahel region |
| VerfasserIn |
F. S. E. Vamborg, V. Brovkin, M. Claussen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2190-4979
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| Digitales Dokument |
URL |
| Erschienen |
In: Earth System Dynamics ; 5, no. 1 ; Nr. 5, no. 1 (2014-02-05), S.89-101 |
| Datensatznummer |
250115296
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| Publikation (Nr.) |
 copernicus.org/esd-5-89-2014.pdf |
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| Zusammenfassung |
| Using the general circulation model ECHAM5–JSBACH forced by observed
sea surface temperatures (SSTs) for the 20th century, we
investigate the role of vegetation and land surface albedo dynamics
in shaping rainfall variability in the Sahel. We use two different
land surface albedo schemes, one in which the albedo of the canopy
is varying and one in which the albedo changes of the
surface below the canopy are also taken into account. The SST forcing
provides the background for simulating the observed decadal signal
in Sahelian rainfall, though the response to SST forcing only is not
strong enough to fully capture the observed signal. The introduction
of dynamic vegetation leads to an increase in interannual
variability of the rainfall, and gives rise to an increased number
of high-amplitude rainfall anomaly events. The dynamic background
albedo leads to an increased persistence of the rainfall anomalies. The increase in persistence means
that the difference between the dry and the wet decades is increased
compared to the other simulations, and thus more closely matching
the observed absolute change between these two periods. These
results highlight the need for a consistent representation of land
surface albedo dynamics for capturing the full extent of rainfall
anomalies in the Sahel. |
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