Pleistocene Antarctic climate variability: ice sheet, ocean and climate interactions

Wilson, David J.; Flierdt, Tina van de; McKay, Robert; Naish, T.

doi:10.1016/b978-0-12-819109-5.00001-3

“…In addition, the stronger post-MBE component of I AV and also I S during deglaciations, enhancing the melting of sea ice and warming of the Southern Ocean, may have destabilized the AIS, increasing its contribution to sea-level highstands. This is consistent with offshore sediment and geochemical data on provenance changes, suggesting increased ice loss from the Wilkes Subglacial Basin during post-MBE interglacials (MIS11c, 5e, and 9e), although the pre-MBE record remains weakly constrained (Wilson et al, 2021). Recently, Mitsui and Boers (2022) developed an artificial neural network (ANN) model that performs a skilful 21 kyr ahead prediction of δ 18 O on the basis of the past δ 18 O history and the insolation evolution.…”

Section: Summary and Discussionsupporting

confidence: 85%

Insolation evolution and ice volume legacies determine interglacial and glacial intensity

Mitsui

¹

,

Tzedakis

²

,

Wolff

³

2022

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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 insolations 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 to 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.

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“…In addition, the stronger post-MBE component of I AV and also I S during deglaciations, enhancing the melting of sea ice and warming of the Southern Ocean, may have destabilized the AIS, increasing its contribution to sea-level highstands. This is consistent with offshore sediment and geochemical data on provenance changes, suggesting increased ice loss from the Wilkes Subglacial Basin during post-MBE interglacials (MIS11c, 5e, and 9e), although the pre-MBE record remains weakly constrained (Wilson et al, 2021). Recently, Mitsui and Boers (2022) developed an artificial neural network (ANN) model that performs a skilful 21 kyr ahead prediction of δ 18 O on the basis of the past δ 18 O history and the insolation evolution.…”

Section: Summary and Discussionsupporting

confidence: 85%

Insolation evolution and ice volume legacies determine interglacial and glacial intensity

Mitsui

¹

,

Tzedakis

²

,

Wolff

³

2022

Preprint

0

View full text Add to dashboard Cite

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.

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Gesell’s Solution to Achieve the SDGs

Fuders

2023

How to Fulfil the UN Sustainability Goals

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Pleistocene Antarctic climate variability: ice sheet, ocean and climate interactions

Cited by 6 publications

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Insolation evolution and ice volume legacies determine interglacial and glacial intensity

Insolation evolution and ice volume legacies determine interglacial and glacial intensity

Insolation evolution and ice volume legacies determine interglacial and glacial intensity

Gesell’s Solution to Achieve the SDGs

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