Numerical experiments with the LMD GCM have been carried out with two different Lhomond parameterizations of land-surface processes. The first one is the usual "bucket model" with a simple reservoir of soil moisture and no vegetation. The second one is a scheme describing the different types of vegetation, called SECHIBA.
We describe the simulation of monsoon in both integrations, over the
period 1979-88. We analyse the differences obtained in the hydrological
cycle over the monsoon region. In order to try to understand the role of
land-surface processes in the monsoon evolution, additional integrations
for the wet and dry years have been performed.