Oligocene Atmospheric CO2 Drawdown Linked to Increased Land Surface Weatherability

Strategic Insights -

A new research study from the Chinese Academy of Sciences has shed light on the driving forces behind the Oligocene era's long-term decrease in atmospheric CO2 levels. The study, funded by the National Natural Science Foundation of China and the Chinese Academy of Sciences, among others, has revealed that the increase in global erosion rate during the Oligocene era led to an increase in land surface weatherability, which in turn modulated the decrease in CO2 levels.

Key Takeaways:

  • The Oligocene era featured a long-term decrease in atmospheric CO2 levels, with the driving force of this drawdown remaining uncertain until now.
  • Research has shown that the increase in global erosion rate during the Oligocene era led to an increase in land surface weatherability.
  • The strength of silicate weathering feedback and CO2 consumption have increased in a setting of high land surface weatherability.
  • The study revealed that the degree of silicate alteration displays 405-kyr eccentricity cycles, with amplified oscillations corresponding to a vigorous hydrological cycle.
  • The research has been peer-reviewed and published in Earth and Planetary Science Letters.

Statistics:

  • The Oligocene era saw a decrease in atmospheric CO2 levels.
  • The global erosion rate increased during the Oligocene era, leading to an increase in land surface weatherability.
  • The strength of silicate weathering feedback and CO2 consumption increased by 405-kyr eccentricity cycles.
  • The study revealed that the silicate weathering rate is elevated in high-weatherability catchments caused by intensive erosion.

Sources:

  • Oligocene Atmospheric Co2 Drawdown Linked To Increased Land Surface Weatherability. Earth and Planetary Science Letters, 2025;665.
  • National Natural Science Foundation of China (NSFC).
  • Chinese Academy of Sciences.
  • Tsinghua University.
  • Second Tibetan Plateau Scientific Expedition and Research (STEP) program.
  • Elsevier (www.elsevier.com).
  • Earth and Planetary Science Letters (www.journals.elsevier.com/earth-and-planetary-science-letters).
  • NewsRx (www.newsrxx.com).