Ancient stalagmites reveal exceptions to Asia–South America monsoon seesaw over the past 450,000 years
In places like South Asia, Africa and parts of the Americas, monsoon rains supply water for drinking, crops and hydropower for billions of people. Understanding the patterns that monsoons tend to follow can help people plan for drought risks affecting agriculture, reservoirs and hydropower across distant regions.
Recent research into stalagmites from caves in Peru has provided new insights into the complex relationship between the Asian and South American monsoons over the past 450,000 years. While these monsoons typically behave like a seesaw, alternating between strong and weak conditions in each region, this study identified 10 episodes where they weakened or strengthened simultaneously, challenging the traditional pattern.
The findings, published in Nature, suggest that factors such as ocean temperatures, greenhouse gases, and temperature contrasts between hemispheres may influence the monsoon system, particularly during intervals of rapid warming. The researchers hope that longer cave records will help determine if other monsoon systems experienced similar anomalies, potentially improving our understanding and predictions of major rainfall reorganizations in response to climate changes.
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