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

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

Abstract:
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 ... mehr


Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1127/metz/2017/0819
ISSN: 0941-2948, 1610-1227
KITopen ID: 1000069413
HGF-Programm 12.01.02; LK 01
Erschienen in Meteorologische Zeitschrift
Schlagworte West African Monsoon, Soil-vegetation-atmosphere interaction, Land surface-atmosphere coupling, Regional Climate Modeling
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