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A new analysis of marine heatwaves shows that the most intense temperature spikes are just the tip of a longer warming episode that can persist for months, a period previously under‑counted by standard monitoring methods. The study reports that traditional measurements miss more than 150% of total heat exposure on average, meaning ecosystems and fisheries may be experiencing far greater stress than reported.
At the same time, researchers have provided strong observational evidence that the Atlantic Meridional Overturning Circulation (AMOC) – a critical driver of global climate – has been weakening steadily over the past two decades. This slowdown could reshape regional weather patterns, alter rainfall distribution, intensify storms, and raise coastal sea levels worldwide.
Why it matters: The hidden heat from prolonged marine heatwaves can exacerbate coral bleaching, fish stock declines, and the spread of marine diseases, while an attenuated AMOC threatens to amplify extreme weather and affect food security far beyond the Atlantic basin.
What to watch next: Scientists will refine satellite and buoy networks to capture the full duration of ocean heat events, and climate models will be updated to incorporate the latest AMOC slowdown trends, helping policymakers anticipate and mitigate cascading impacts on marine ecosystems and global climate. [[1]]