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This Week in Science
Shifting sands in the Sahara Desert he Sahara is the world's largest desert; its size fluctuates between about 7 and 9 million square kilometers. Images of the desert that reveal vegetation patterns, which are a direct reflection of rainfall, have been made by polar-orbiting meteorological satellites for the past decade. Between 1980 and 1990 many northward and southward shifts in the southern Saharan-Sahelian boundary have occurred. The year-by-year changes are described by Tucker et al. (pagedoi:10.1126/science.1991.253.5017.twis fatcat:giikkernaraj5lswdd7yesb3wy