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Home NEWS Science News Chemistry

Deep ocean warming as climate changes

Bioengineer by Bioengineer
May 17, 2022
in Chemistry
Reading Time: 2 mins read
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The subtropical North Atlantic
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Much of the “excess heat” stored in the subtropical North Atlantic is in the deep ocean (below 700m), new research suggests.

The subtropical North Atlantic

Credit: Marie-Jose Messias

Much of the “excess heat” stored in the subtropical North Atlantic is in the deep ocean (below 700m), new research suggests.

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 – where colder, dense water sinks into the deep ocean and spreads slowly south.

The findings highlight the importance of warming transferring by AMOC from one region to another.

Dr Messias said excess heat from the Southern Hemisphere oceans is becoming important in the North Atlantic – now accounting for about a quarter of excess heat.

The study used temperature records and chemical “tracers” – compounds whose make-up can be used to discover past changes in the ocean.

The paper, published in the Nature journal Communications Earth & Environment, is entitled: “The redistribution of anthropogenic excess heat is a key driver of warming in the North Atlantic.”

  • Professor Callum Roberts, from the University of Exeter, will speak in New York on 23 May at an event called: “What will it take to protect the oceans?” For more information, visit https://www.exeter.ac.uk/news/events/details/index.php?event=12135


Journal

Communications Earth & Environment

DOI

10.1038/s43247-022-00443-4

Method of Research

Observational study

Subject of Research

Not applicable

Article Title

The redistribution of anthropogenic excess heat is a key driver of warming in the North Atlantic

Article Publication Date

17-May-2022

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