Climate change has reduced ocean mixing far more than expected

Credit: CC0 Public Domain

The ocean is dynamic in nature, playing a crucial role as a planetary thermostat that buffer global warming. However, in response to climate change, the ocean has generally become stabler over the past 50 years. Six times stabler, in fact, than previously estimated—as shown by a new study that researchers from the CNRS, Sorbonne University, and IFREMER have conducted within the scope of an international collaboration.

Warming waters, melting glaciers, and disrupted precipitation patterns have created an ocean surface layer cut off from the depths. Just as oil and water separate, so this division of surface and deeper waters limits oceanic mixing, making it harder for the ocean to mitigate .

Furthermore, climate change has strengthened winds, which has thickened the ocean surface layer by 5 to 10 m per decade over the last half century. This has hindered vital access to light for most marine organisms within it.

Published in Nature (March 24, 2021), these findings underscore the consequences of climate change and anthropogenic phenomena for the ocean, the life it harbors, and its capacity to remain a global thermostat into the future.

More information: Summertime increases in upper ocean stratification and mixed layer depth, Nature (2021). DOI: 10.1038/s41586-021-03303-x

Journal information: Nature

Provided by CNRS

Citation: Climate change has reduced ocean mixing far more than expected (2021, March 24) retrieved 5 December 2023 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Explore further

The deep ocean is warming slowly—but dramatic changes are ahead


Feedback to editors