Monsoon zonal seesaw: Development of the South Asian monsoon aridified North Africa in the Cenozoic.

Asian monsoon rainfall intensification and poleward shift are linked to North Africa aridification via a monsoon–desert pathway, with comparable contributions from each change.

• Why it matters: North Africa’s early Cenozoic humid-to-arid transition and South Asian monsoon intensification have been treated as separate paleogeographic responses, leaving the coupling mechanism unclear.
• What they did: The study used multiple ensembles of paleoclimate simulations plus an atmospheric-response model to imposed diabatic heating to test how monsoon diabatic heating affects North Africa.
• The result: The simulations indicate a persistent dynamical pathway connecting the South Asian and North African monsoons, suggesting it played a major role in early Cenozoic aridification.

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