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## Abstract Fluxes from the land surface into the atmosphere exhibit strong variability on diurnal and daily time‐scales during the Sahelian wet season. The influence of this variability on the atmosphere is examined here using a general circulation model. A land‐surface scheme with an improved description of the sparse vegetation which characterizes the Sahel is introduced, and compared with simulations using existing parameters. With smaller evaporation rates, the sparse vegetation results in a warmer and deeper planetary boundary layer (PBL) in better agreement with observations. The diurnal cycle in simulated rainfall is much weaker, due to less frequent triggering of daytime convection. The damping of diurnal variability is accompanied by enhanced daily variability, with a deep moist PBL developing over several days. Above the sparsely vegetated surface, there is also greater African easterly wave (AEW) activity, and more long‐lived rain events associated with it. A mechanism is proposed to explain the increased frequency of AEWs above sparser vegetation, based on wave composites in the model. Surface heating of the lower atmosphere is modulated strongly by AEWs. This occurs v

Who reads The diurnal cycle and African easterly waves: A land surface perspective?

Author

Christopher M. Taylor; Douglas B. Clark

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley (ISSN 0035-9009)

Published

2001

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)