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.
Georgina Rannard, Mark Poynting, Jana Tauschinski, Becky Dale - BBC climate reporter & data teamThe 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 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." "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.
Another El Niño has now started but scientists say it is still weak - meaning ocean temperatures are expected to rise further above average in the coming months.
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