Science

Ancient stalagmites reveal exceptions to Asia–South America monsoon seesaw over the past 450,000 years

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Briefings

Recent stalagmite records from Asia, Africa, and the Americas show that monsoon patterns have shifted over the past 450,000 years, revealing exceptions to the traditional Asia–South America monsoon seesaw model. This research helps scientists understand how climate variability impacts water resources for billions of people, though specific regional variations remain unquantified.

Key points

• Stalagmites in South Asia, Africa, and parts of the Americas contain records of monsoon rainfall variability spanning 450,000 years.
• The data suggests deviations from the standard Asia–South America monsoon seesaw pattern, indicating complex regional climate dynamics.

Context

Monsoon patterns influence drinking water, agriculture, and hydropower for billions globally. Understanding these shifts is critical for planning drought risks and managing water resources across distant regions.

Limitations

Evidence is limited to specific geographic regions (Asia, Africa, Americas) and lacks quantitative data on rainfall amounts, duration, or specific climate drivers.

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