Nature Study Confirms Record 2023-2024 Sea Surface Temperature Jump

A Nature study analysing 270 climate-model simulations confirmed that the record 2023-2024 sea surface temperature surge, exceeding the prior record by 0.25°C, was an extreme but not unexpected event under current warming. The findings reinforce the disproportionate climate vulnerability of Global South economies, including India, that face marine heatwaves and disruptions to fisheries and agriculture.

Published in Nature (volume 639, pages 942-946) by Terhaar, Burger, Vogt, Frölicher and Stocker (2025), the study addresses whether climate models can represent recent ocean warming. By analysing 270 simulations across a wide range of models, researchers showed the models can reproduce record-shattering jumps in global sea surface temperatures. The observed jump exceeded the previous record by 0.25°C and is estimated to be a 1-in-512-year event under the current warming trend; without anthropogenic warming, such an event would have been practically impossible.

The research identifies the Global South as disproportionately vulnerable, where communities already face increased frequency and intensity of marine heatwaves, sea-level rise, and disruptions to fisheries and agriculture. The models indicate these extreme jumps often coincide with El Niño events, though a strong El Niño is described as a necessary but not sufficient condition. Coastal and agricultural economies in developing regions, with limited adaptive capacity, bear the brunt of these ocean-warming impacts on food security and livelihoods.

The study concludes the 2023-2024 jump is unlikely to indicate a permanent shift to a higher warming trajectory, with sea surface temperatures expected to revert to the long-term trend in coming years. It stresses the urgent need for global mitigation alongside increased investment in adaptation, resilience and sustainable development for vulnerable communities. Entities in exposed regions should monitor validated climate-model projections to assess regional climate risks and prepare for the persistent threat of future record-shattering events.

Key figure — Observed SST jump: 0.25°C above previous record, a 1-in-512-year event