The rapid acceleration of ocean temperatures in the last month is an anomaly that scientists have yet to explain. Data collated by the US National Oceanic and Atmospheric Administration (NOAA), known as the Optimum Interpolation Sea Surface Temperature (OISST) series, gathered by satellites and buoys, has shown temperatures higher than in any previous year, in a series stretching back to 1981, continuously over the past 42 days.
The world is thought to be on the brink of an El Niño weather event this year - a cyclical weather system in the Pacific that has a warming impact globally. But the El Niño system is yet to develop, so this oscillation cannot explain the recent rapid heating at a time of year when ocean temperatures are normally declining.
Prof Mike Meredith of the British Antarctic Survey told the Guardian: "This has got scientists scratching their heads. The fact that it is warming as much as it has been is a real surprise, and very concerning. It could be a short-lived extreme high, or it could be the start of something much more serious."
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