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El Nino's Return: Oceans Brace for Heat Wave
12 Jun
Summary
- Strong El Nino expected by late fall 2026, impacting global weather.
- Marine heat waves worsened by El Nino threaten ecosystems and fisheries.
- Bottom marine heat waves can be more intense and last longer than surface ones.
Forecast models indicate a high probability of a strong El Nino developing by late fall 2026, with the potential to influence weather patterns and ocean temperatures across the globe.
El Nino is characterized by the warming of ocean waters off the coast of Ecuador, which can reconfigure global wind, rainfall, and temperature patterns. This warming trend is expected to exacerbate marine heat waves.
Marine heat waves, periods of extreme ocean warming, can devastate marine ecosystems such as coral reefs and seagrass meadows, significantly impacting global fisheries.
These warming events can lead to severe consequences for marine organisms, including increased metabolism in fish that can cause starvation, coral bleaching, harmful algal blooms, and increased strandings of marine mammals.
Even seafloor temperatures can experience heat waves, sometimes exceeding surface warming in intensity and duration. These bottom heat waves can stress species like the Bering Sea snow crab, leading to population declines.
While predictions for El Nino's impact are made months in advance, conditions can evolve. Current forecasts suggest several marine heat waves developing, potentially affecting close to half the global ocean by the end of 2026, with coasts of California and Mexico, the Indian Ocean, and parts of the Southern Ocean at high risk.
