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Area of Science:

  • Paleoclimatology
  • Earth System Science
  • Paleontology

Background:

  • The Permian-Triassic Mass Extinction (PTME) was the most severe extinction event in the Phanerozoic.
  • Global warming from Siberian Traps volcanism is the primary suspected cause.
  • The prolonged duration of super-greenhouse conditions post-volcanism remains unexplained.

Purpose of the Study:

  • To investigate the reasons for sustained super-greenhouse conditions during the Early Triassic.
  • To reconstruct spatio-temporal changes in terrestrial plant productivity across the PTME.
  • To model the impact of vegetation collapse on the Early Triassic climate-carbon system.

Main Methods:

  • Utilized fossil occurrences and lithological climate indicators to map plant productivity.
  • Employed climate-biogeochemical modeling to simulate Early Triassic conditions.
  • Analyzed the relationship between vegetation loss, carbon sequestration, and atmospheric CO2 levels.

Main Results:

  • Significant terrestrial vegetation loss occurred during the PTME, particularly in tropical regions.
  • Reduced plant productivity led to decreased organic carbon sequestration.
  • Restricted chemical weathering further contributed to prolonged high atmospheric CO2 levels.

Conclusions:

  • Terrestrial vegetation collapse amplified warming by reducing carbon sequestration and chemical weathering.
  • This feedback loop helps explain the persistence of super-greenhouse conditions for millions of years.
  • The study supports the existence of climate-carbon system thresholds where vegetation loss can trigger amplified warming.