Preprints
https://doi.org/10.5194/cp-2022-41
https://doi.org/10.5194/cp-2022-41
 
10 May 2022
10 May 2022
Status: this preprint is currently under review for the journal CP.

Insolation evolution and ice volume legacies determine interglacial and glacial intensity

Takahito Mitsui1,2, Polychronis C. Tzedakis3, and Eric W. Wolff4 Takahito Mitsui et al.
  • 1Earth System Modelling, School of Engineering & Design, Technical University of Munich, Munich, Germany
  • 2Potsdam Institute for Climate Impact Research, Potsdam, Germany
  • 3Environmental Change Research Centre, Department of Geography, University College London, London, UK
  • 4Department of Earth Sciences, University of Cambridge, Cambridge, UK

Abstract. Interglacials and glacials represent low and high ice volume end-members of ice age cycles. While progress has been made in our understanding of how and when transitions between these states occur, their relative intensity has been lacking an explanatory framework. With a simple quantitative model, we show that over the last 800,000 years interglacial intensity can be described as a function of the strength of the previous glacial and the summer insolation at high latitudes in both hemispheres during the deglaciation. Since the precession components in the boreal and austral insolation counteract each other, the amplitude increase in obliquity cycles after 430,000 years ago is imprinted in interglacial intensities, contributing to the manifestation of the so-called Mid-Brunhes Event. Glacial intensity is also linked with the strength of the previous interglacial, the time elapsed from it, and the evolution of boreal summer insolation. Our results suggest that the memory of previous climate states and the time course of the insolation are crucial for understanding interglacial and glacial intensities.

Takahito Mitsui et al.

Status: open (until 05 Jul 2022)

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Takahito Mitsui et al.

Takahito Mitsui et al.

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Short summary
We provide simple quantitative models for the interglacial and glacial intensities over the last 800,000 years. Our results suggest that the memory of previous climate states and the time course of the insolation in both hemispheres are crucial for understanding interglacial and glacial intensities. In our model, the shift in interglacial intensities at the Mid-Brunhes Event (~430 ka) is ultimately attributed to the amplitude-modulation of obliquity.