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HomeUS NewsPlate Tectonics Drives Ocean Oxygenation – Watts Up With That?

Plate Tectonics Drives Ocean Oxygenation – Watts Up With That?


Peer-Reviewed Publication

CNRS

Dark, organic-rich sediments indicating conditions of low ocean oxygenation, sandwiched between limestone beds.
IMAGE: DARK, ORGANIC-RICH SEDIMENTS INDICATING CONDITIONS OF LOW OCEAN OXYGENATION, SANDWICHED BETWEEN LIMESTONE BEDS. view more CREDIT: © CHRISTOPHE THOMAZO

Until now, it has been assumed that the oxygenation of the oceans over geological timescales has mainly been driven by atmospheric oxygen levels. However, a new study published in Nature on June 27 2022  suggests otherwise. Work by scientists at the Biogeosciences Laboratory (CNRS/UBFC), together with their colleagues at the University of California’s Department of Earth and Planetary Sciences, shows that the movement of tectonic plates has probably contributed to ocean oxygenation. To demonstrate this, the scientists used a three-dimensional climate model to recreate conditions on Earth from 540 million years ago to the present day, in particular taking into account ocean circulation currents. In their model, the scientists modified the position of the continents while keeping the atmospheric oxygen concentration constant. The result was that the oxygen concentration in the oceans increased, despite a constant level of oxygen in the atmosphere. The new paper thus shows for the first time that atmospheric and oceanic oxygen levels are largely independent of each other. Since oxygen is vital to marine life, these findings reveal the hitherto underestimated role played by plate tectonics in the evolution of biodiversity in the oceans over geological time scales.


JOURNAL

Nature

DOI

10.1038/s41586-022-05018-z 

METHOD OF RESEARCH

Computational simulation/modeling

SUBJECT OF RESEARCH

Not applicable

ARTICLE TITLE

Continental configuration controls ocean oxygenation during the Phanerozoic

ARTICLE PUBLICATION DATE

17-Aug-2022



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