Obliquity pacing of the late Pleistocene glacial terminations

  title={Obliquity pacing of the late Pleistocene glacial terminations},
  author={Peter J. Huybers and Carl Wunsch},
The 100,000-year timescale in the glacial/interglacial cycles of the late Pleistocene epoch (the past ∼700,000 years) is commonly attributed to control by variations in the Earth's orbit. This hypothesis has inspired models that depend on the Earth's obliquity (∼ 40,000 yr; ∼40 kyr), orbital eccentricity (∼ 100 kyr) and precessional (∼ 20 kyr) fluctuations, with the emphasis usually on eccentricity and precessional forcing. According to a contrasting hypothesis, the glacial cycles arise… 

Obliquity and precession as pacemakers of Pleistocene deglaciations

A conceptual model for glacial cycles and the middle Pleistocene transition

Milankovitch’s astronomical theory of glacial cycles, attributing ice age climate oscillations to orbital changes in Northern-Hemisphere insolation, is challenged by the paleoclimatic record. The

Combined obliquity and precession pacing of the late Pleistocene glacial cycles

Milankovitch postulated that deglaciation occurs when Earth’s obliquity is high and precession brings Earth’s eccentric orbit near the sun during Northern summer, and this general concept has been

The role of orbital forcing in the Early Middle Pleistocene Transition

Combined obliquity and precession pacing of late Pleistocene deglaciations

Deficiencies in time control that have long stymied efforts to establish orbital effects on deglaciation are overcome using a new statistical test that focuses on maxima in orbital forcing.

Evidence for Obliquity Forcing of Glacial Termination II

A new speleothem-based North Atlantic marine chronology is presented that shows that the penultimate glacial termination commenced 141,000 ± 2500 years before the present, too early to be explained by Northern Hemisphere summer insolation but consistent with changes in Earth’s obliquity.

Changing climatic response: a conceptual model for glacial cycles and the Mid-Pleistocene Transition

Abstract. Milankovitch's astronomical theory of glacial cycles, attributing ice age climate oscillations to orbital changes in Northern Northern-Hemisphere insolation, is challenged by the

Links between eccentricity forcing and the 100,000-year glacial cycle

The 100,000-year glacial cycles are generally thought to be driven by the eccentricity of the Earth’s orbit. Statistical analyses of climate variability and orbital forcing over the past five million

Mid-Pleistocene revolution and the ‘eccentricity myth’

  • M. MaslinA. Ridgwell
  • Geography, Environmental Science
    Geological Society, London, Special Publications
  • 2005
Abstract The mid-Pleistocene revolution (MPR) is the term used to describe the transition between 41 ka and 100 ka glacial-interglacial cycles which occurred about one million years ago. Despite

The Pleistocene Glacial Cycles and Millennial-Scale Climate Variability

  • P. Ditlevsen
  • Environmental Science, Geography
  • 2022
ABSTRACT The Pleistocene glacial cycles are the most prominent climate variations over the past three million years. They are the climatic response to variations in the incoming solar radiation,



The timing of Pleistocene glaciations from a simple multiple-state climate model

The Earth's climate over the past million years has been characterized by a succession of cold and warm periods, known as glacial–interglacial cycles, with periodicities corresponding to those of the

The timing of major climate terminations

  • M. Raymo
  • Environmental Science, Geography
  • 1997
A simple, untuned “constant sedimentation rate” timescale developed using three radiometric age constraints and eleven δ18O records longer than 0.8 Myr provides strong support for the validity of the

The 41 kyr world: Milankovitch's other unsolved mystery

[1] For most of the Northern Hemisphere Ice Ages, from ∼3.0 to 0.8 m.y., global ice volume varied predominantly at the 41,000 year period of Earth's orbital obliquity. However, summer (or summer

Orbital insolation, ice volume, and greenhouse gases.

Modeling the Climatic Response to Orbital Variations

This article summarizes how the theory has evolved since the pioneer studies of James Croll and Milutin Milankovitch, reviews recent evidence that supports the theory, and argues that a major opportunity is at hand to investigate the physical mechanisms by which the climate system responds to orbital forcing.

Variations in the Earth's Orbit: Pacemaker of the Ice Ages

It is concluded that changes in the earth's orbital geometry are the fundamental cause of the succession of Quaternary ice ages and a model of future climate based on the observed orbital-climate relationships, but ignoring anthropogenic effects, predicts that the long-term trend over the next sevem thousand years is toward extensive Northern Hemisphere glaciation.

Coherence resonance and ice ages

[1] The processes and feedbacks responsible for the 100-kyr cycle of Late Pleistocene global climate change are still being debated. This paper presents a numerical model that integrates (1)