What are the main observed characteristics of the Sahel rainy season? What is essential for the models to replicate in order to be able to capture long-term changes?

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Original Questions

1. What are the main observed characteristics of the
   Sahel rainy season? What is essential for the
   models to replicate in order to be able to
   capture long-term changes?
2. What does the paleo record suggest as important
   players and mechanisms for long-term variability?
3. What are the points of agreement and
   disagreement regarding mechanisms of Sahel
   rainfall variability that emerge in integrations
   with different atmospheric GCMs? With the
   different coupled GCMs in the IPCC archive?
4. Do GCMs lack adequate representation of essential
   processes, such as dynamic vegetation or dust?
   Can different representations of atmosphere/land
   coupling be at the root of differences among
   Sahel rainfall changes in GCM integrations?

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