Results of simulating the addition of a large body of water to the Sahara Desert using the RAND version of the Mintz-Arakawa general circulation model. The simulated lake is a relatively small perturbation to the earth's boundary condition and was chosen to test the hypothesis that an observable and statistically significant change would be produced in the local circulation. The flux and flux divergence of water vapor over North Africa was studied to determine where the water added to the atmosphere by the lake would be precipitated. A significant change in precipitation was subsequently observed over the selected area. A new statistical measure is described and used to measure the significance of the observed change. 40 pp. Ref.
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