Oceans have absorbed about 90% of warming caused by humans. The study found that in the subtropical North Atlantic (25°N), 62% of the warming from 1850-2018 is held in the deep ocean.
The researchers — from the University of Exeter and the University of Brest — estimate that the deep ocean will warm by a further 0.2°C in the next 50 years.
Ocean warming can have a range of consequences including sea-level rise, changing ecosystems, currents and chemistry, and deoxygenation.
“As our planet warms, it’s vital to understand how the excess heat taken up by the ocean is redistributed in the ocean interior all the way from the surface to the bottom, and it is important to take into account the deep ocean to assess the growth of Earth’s ‘energy imbalance’,” said Dr Marie-José Messias, from the University of Exeter.
“As well as finding that the deep ocean is holding much of this excess heat, our research shows how ocean currents redistribute heat to different regions.
“We found that this redistribution was a key driver of warming in the North Atlantic.”
The researchers studied the system of currents known as the Atlantic Meridional Overturning Circulation (AMOC). AMOC works like a conveyer belt, carrying warm water from the tropics north…
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