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Water vapor is the number one green house gas. Expanding the ocean into the desert would certainly speed the rate at which the water evaporated so the most important factor would be cloud formation, which is unpredictable.


I have no idea where the sahara desert is in relation to the jet streams in the upper atmosphere but...

If the vapor over the desert formed clouds, it would shade the desert, provide increased rainfall, lessen the evaporation and lower the areas temperature.


If the vapor formed clouds but they were carried away by winds, other regions would have the cloud cover, heavier rains, and lower temps (depending on where they end up).


If the vapor doesn't form clouds, it will simply create greater amounts of greenhouse gas in the atmosphere.


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