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A dynamical systems perspective on the Mid-Pleistocene Transition.

N R Golledge1

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PubMed
Summary
This summary is machine-generated.

Earth's climate cycles became colder and more asymmetric during the Pleistocene epoch. This study suggests increasing internal feedback synchronization, not just orbital forcing, drove these glacial-interglacial shifts.

Keywords:
Earth-system dynamicsMilankovitch cyclesPalaeoclimatePlio-Pleistocenefeedbacks

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Area of Science:

  • Paleoclimatology
  • Earth System Science
  • Dynamical Systems Theory

Background:

  • Earth's climate has progressively cooled since the Pliocene, leading to increasingly severe and asymmetric glacial cycles through the Pleistocene epoch.
  • The Mid-Pleistocene Transition (MPT) marks a significant intensification of these climate changes, with ongoing debate about external forcing versus internal feedbacks.
  • Understanding the drivers of glacial-interglacial cycles is crucial for reconstructing past climate dynamics and predicting future climate behavior.

Purpose of the Study:

  • To investigate the mechanisms driving the increasing asymmetry and intensity of glacial cycles during the Pleistocene, particularly around the Mid-Pleistocene Transition (MPT).
  • To model the asymmetric temperature changes observed in the Late Pleistocene and explore the role of internal climate system feedbacks.
  • To determine whether external drivers or internal feedbacks were primarily responsible for the observed progressive changes in global climate.

Main Methods:

  • Analysis of Plio-Pleistocene climate cycle characteristics using palaeo-environmental proxies.
  • Development and application of simple conceptual dynamical systems models.
  • Simulation of Late Pleistocene temperature changes to replicate observed asymmetry.
  • Investigation of increasing coupling and synchronization within the Earth system through the MPT.

Main Results:

  • Dynamical systems models successfully simulated the asymmetric pattern of Late Pleistocene temperature changes.
  • Increasing coupling between components of the global climate system emerged as a potential mechanism for climate cycle asymmetry.
  • Evidence suggests that through the MPT, internal feedbacks became dominant over orbital insolation variability due to increased synchronization.

Conclusions:

  • The study proposes that increasing synchronization of Earth system elements, entrained at a 100,000-year frequency, drove the intensification and asymmetry of glacial cycles.
  • Internal feedbacks, amplified by synchronization, pushed global temperatures towards far-from-equilibrium glacial states.
  • These glacial states were ultimately terminated by cascading environmental events linked to collapsing Earth system connectivity.