HIGHLIGHTS
SUMMARY
The authors examine the combined effects of pCO2 and monsoon rainfall on savanna ecosystems and the underlying controls of high- vs low-latitude forcing of monsoon rainfall in Northwest Africa during the Middle to Late Pleistocene. The authors reconstruct monsoon intensity using both plant waxderived δDprecip and dust fluxes normalized to the extraterrestrial 2 3He (3He ) constant flux proxy, and assess the relative controls ET of monsoon rainfall and pCO2 on savanna ecosystem structure using plant-wax δ13C that tracks C3/C4 vegetation abundance (related to tree/grass cover in African savannas). In fact . . .
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