Some numerical experiments on surface albedo variation

A two-level quasi-geostrophic general circulation model is developed to test various theories relating to surface albedo changes in the Sahara/Sahel regions of Africa. The heating function in the model is varied so as to examine the effects of both increases and decreases in surface albedo. Loss of vegetation cover is linked to increased surface albedo, and from the experiments, the delicate balance between the Sahara/Sahel is noted. Revegetating the Sahara would tend to decrease the surface albedo and the model shows that this experiment would be successful in reclaiming some of the desert.