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05-08-2023
LONDON/ BRUSSELS: The oceans have hit their hottest ever recorded temperature as they soak up warmth from climate change, with dire implications for our planet’s health.
The average daily global sea surface temperature beat a 2016 record this week, according to the EU’s climate change service Copernicus.
It reached 20.96C. That’s far above the average for this time of year.
Oceans are a vital climate regulator. They soak up heat, produce half Earth’s oxygen and drive weather patterns.
Warmer waters have less ability to absorb carbon dioxide, meaning more of that planet-warming gas will stay in the atmosphere and it can also accelerate the melting of glaciers that flow into the ocean, leading to more sea level rise.
Hotter oceans and heatwaves disturb marine species like fish and whales as they move in search of cooler waters, upsetting the food chain. Experts warn that fish stocks could be affected.
Some predatory animals including sharks can become aggressive as they get confused in hotter temperatures.
“The water feels like a bath when you jump in,” says Dr Kathryn Lesneski, who is monitoring a marine heatwave in the Gulf of Mexico for the National Oceanic and Atmospheric Administration. “There is widespread coral bleaching at shallow reefs in Florida and many corals have already died.”
“We are putting oceans under more stress than we have done at any point in history,” says Dr Matt Frost, from the Plymouth Marine Lab in the UK, referring to the fact pollution and overfishing also change the oceans.
Scientists are worried about the timing of this broken record.
Dr Samantha Burgess, from the Copernicus Climate Change Service, says March should be when the oceans globally are warmest, not August.
“The fact that we’ve seen the record now makes me nervous about how much warmer the ocean may get between now and next March,” she says.
“It is sobering to see this change happening so quickly,” says Prof Mike Burrows, who is monitoring impacts on Scottish sea shores with the Scottish Association for Marine Science.
Scientists are investigating why the oceans are so hot right now but say that climate change is making the seas warmer as they absorb most of the heating from greenhouse gas emissions.
“The more we burn fossil fuels, the more excess heat will be taken out by the oceans, which means the longer it will take to stabilize them and get them back to where they were,” explains Dr Burgess.
The new average temperature record beats one set in 2016 when the naturally occurring climate fluctuation El Niño was in full swing and at its most powerful. (Int’l News Desk)
