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Orbital eccentricity and internal feedbacks drove the Triassic megamonsoon variability.

Runjian Chu1,2, Huaichun Wu3,4,5, Jian Zhang6

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The Middle Triassic megamonsoon

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Area of Science:

  • Paleoclimatology
  • Earth System Science
  • Orbital Dynamics

Background:

  • The Triassic megamonsoon's evolution is linked to Earth's orbital variations.
  • The precise mechanisms driving these orbital-scale monsoon cycles remain unclear.

Purpose of the Study:

  • To investigate orbital-scale megamonsoon variability during the Middle Triassic (246–239 Ma).
  • To synthesize paleoclimate data with climate models to understand monsoon dynamics.

Main Methods:

  • Integrated high-resolution reconstructions of hydrologic fluctuations from lacustrine sediments (Ordos Basin).
  • Utilized lithological and magnetic susceptibility data series.
  • Employed climate simulations and data-model synthesis.

Main Results:

  • Identified monsoon cycles in the 20, 100, and 405 kyr Milankovitch bands.
  • Revealed a ~3.3 Myr eccentricity-related cycle influencing monsoons, temperature, carbon cycles, and sea level.
  • Earth system models demonstrated the impact of orbital configurations and CO₂ on megamonsoon dynamics.

Conclusions:

  • Orbital forcing and Earth system feedbacks significantly shape long-term megamonsoon variability.
  • Megamonsoon dynamics exhibit threshold responses to solar radiation.
  • Findings enhance understanding of astronomical influences on paleoclimate patterns.