Impact of forests on mesoscale meteorology

André, J.-C. ; Bougeault, Philippe ; Mahfouf, Jean-François ; Mascart, P. ; Noilhan, Joël ; Pinty, J. -p.

The effect of forests on local meteorological circulations is discussed with particular regard to the consequence of their lower albedo, enhanced roughness and larger minimal stomatal resistance when compared with agricultural crops. The effect of these is determined by numerical simulation using two different mesoscale atmospheric models. Emphasis is given to the surface energy budget because this is the driving mechanism behind atmospheric circulation at the mesoscale. Experimental measurements taken during the 'HAPEX-MOBILHY' programme are shown to be consistent with the conclusions drawn from this numerical simulation.</p>

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