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International audienceAlthough the timing of the termination of theAfrican Humid Period (AHP) is now relatively well estab-lished, the modes and controlling factors of this drying arestill debated. Here, through a geomorphological approach,we characterize the regression of Lake Turkana at the endof the AHP. We show that lake level fall during this periodwas not continuous but rather stepwise and consisted of fiveepisodes of rapid lake level fall separated by episodes markedby slower rates of lake level fall. Whereas the overall regres-sive trend reflects a decrease in regional precipitations linkedto the gradual reduction in Northern Hemisphere summer in-solation, itself controlled by orbital precession, we focus dis-cussion on the origin of the five periods of accelerated lakelevel fall. We propose that these periods are due to temporaryreductions in rainfall across the Lake Turkana area associ-ated with repeated westward displacement of the Congo AirBoundary (CAB) during solar activity minima

Stepwise drying of Lake Turkana at the end of the African Humid Period: a forced regression modulated by solar activity variations?