The world’s oceans were hotter than ever previously recorded on Saturday, according to the latest data.
The average surface temperature was 21.1C, with the rising marine heat a stark indicator of the climate crisis. More than 90% of the heat trapped by carbon dioxide from fossil fuel burning enters the oceans.
Hotter oceans exacerbate the sea level rise and extreme storms that threaten billions of people, as well as driving marine heatwaves that decimate sea life and undermine coastal livelihoods, scientists warned.
Other than that, it’s no big deal. Go on, buy that new SUV, you know you want to.
The northern hemisphere summer has already been hit by record-breaking heatwaves, drought and wildfires in Europe and North America, and intense rain and typhoons in Asia.
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“The record is another clear signal of an ocean under growing stress,” said Dr Samantha Burgess, at the European Union’s Copernicus Climate Change Service (C3S), which produced the new data. “El Niño is adding heat to the system, but it is doing so on top of decades of human-driven warming. The consequences are already visible: the number of marine heatwave days globally has more than tripled since the early 1990s.”
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“The record is another clear signal of an ocean under growing stress,” said Dr Samantha Burgess, at the European Union’s Copernicus Climate Change Service (C3S), which produced the new data. “El Niño is adding heat to the system, but it is doing so on top of decades of human-driven warming. The consequences are already visible: the number of marine heatwave days globally has more than tripled since the early 1990s.”
Warmer oceans contribute to sea level rise because of thermal expansion of the water, increasing flooding risks for coastal communities and low-lying island nations. Higher ocean temperatures also supercharge extreme weather events, because warmer seas transfer more energy and water vapour to the atmosphere, intensifying rainfall and storms.
Most of the planet-heating CO2 from fossil fuel burning and forest destruction is absorbed by the oceans. However, a hotter ocean is less efficient at absorbing CO2. This is potentially weakening one of the planet’s most important natural buffers against global heating, the scientists said.
Oh well.
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