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Impact of soil-vegetation-atmosphere interactions on the spatial rainfall distribution in the Central Sahel

Breil, Marcus; Panitz, Hans-Jürgen; Schädler, Gerd

In a Regional Climate Model (RCM) the interactions between the land surface and the atmosphere are
described by a Soil-Vegetation-Atmosphere-Transfer Model (SVAT). In the presented study two SVATs
of different complexity (TERRA-ML and VEG3D) are coupled to the RCM COSMO-CLM (CCLM) to
investigate the impact of different representations of soil-vegetation-atmosphere interactions on the West
African Monsoon (WAM) system. In contrast to TERRA-ML, VEG3D comprises a more detailed description
of the land-atmosphere coupling by including a vegetation layer in its structural design, changing the
treatment of radiation and turbulent fluxes. With these two different model systems (CCLM-TERRA-ML
and CCLM-VEG3D) climate simulations are performed for West Africa and analyzed. The study reveals
that the simulated spatial distribution of rainfall in the Sahel region is substantially affected by the chosen
SVAT. Compared to CCLM-TERRA-ML, the application of CCLM-VEG3D results in higher near surface
temperatures in the Sahel region during the rainy season. This implies a southward expansion of the Saharian
heat-low. Consequently, the mean position of the African Easterly Jet (AEJ) is also shifted to the south,
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Volltext §
DOI: 10.5445/IR/1000069413
DOI: 10.1127/metz/2017/0819
Zitationen: 6
Zitationen: 5
Cover der Publikation
Zugehörige Institution(en) am KIT Fakultät für Physik (PHYSIK)
Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 0941-2948, 1610-1227
KITopen-ID: 1000069413
HGF-Programm 12.01.02 (POF III, LK 01) Proc.res.f.multisc.predictab.of weather
Erschienen in Meteorologische Zeitschrift
Verlag Borntraeger Science Publishers
Band 26
Heft 4
Seiten 379-389
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter West African Monsoon, Soil-vegetation-atmosphere interaction, Land surface-atmosphere coupling, Regional Climate Modeling
Nachgewiesen in Web of Science
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