Updated

On 13 September 2026, ScienceDaily reported research showing that a climatic connection between the Indian and Pacific oceans that has persisted for roughly four centuries is now breaking down. Scientists using long-term climate records, including proxy evidence stretching back hundreds of years, described the decoupling as exceptional relative to anything in that archive. The analysis also indicated that past volcanic activity influenced the historical relationship between the two basins. The interaction between the tropical Indian and Pacific oceans helps govern monsoon behavior, drought and flood patterns, and the El Niño–Southern Oscillation, which affects agriculture and disaster risk for billions of people. A weakening or shifting of that coupling would complicate seasonal forecasting models that assume the historical relationship holds. The researchers attributed the change to human-driven global warming rather than natural variability alone. The finding contributes to a growing body of evidence that warming is altering large-scale ocean-atmosphere circulation systems.