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Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions

Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions
Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions
Studies of past glacial cycles yield critical information about climate and sea-level (ice-volume) variability, including the sensitivity of climate to radiative change, and impacts of crustal rebound on sea-level reconstructions for past interglacials. Here we identify significant differences between the last and penultimate glacial maxima (LGM and PGM) in terms of global volume and distribution of land ice, despite similar temperatures and radiative forcing. Our analysis challenges conventional views of relationships between global ice volume, sea level, seawater oxygen isotope values, and deep-sea temperature, and supports the potential presence of large floating Arctic ice shelves during the PGM. The existence of different glacial ‘modes’ calls for focussed research on the complex processes behind ice-age development. We present a glacioisostatic assessment to demonstrate how a different PGM ice-sheet configuration might affect sea-level estimates for the last interglacial. Results suggest that this may alter existing last interglacial sea-level estimates, which often use an LGM-like ice configuration, by several metres (likely upward).
0277-3791
1-28
Rohling, Eelco J.
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Hibbert, Fiona D.
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Williams, Felicity H.
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Grant, Katherine M.
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Marino, Gianluca
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Foster, Gavin L.
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Hennekam, Rick
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De Lange, Gert J.
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Roberts, Andrew P.
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Yu, Jimin
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Webster, Jody M.
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Yokoyama, Yusuke
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Rohling, Eelco J.
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Hibbert, Fiona D.
ec7114df-e18f-4db9-85f3-79f94be59712
Williams, Felicity H.
be07046a-fbf7-4883-8191-6f60d0ee994d
Grant, Katherine M.
2f1c48a6-fcc9-43cc-9497-df6daef22a88
Marino, Gianluca
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Foster, Gavin L.
fbaa7255-7267-4443-a55e-e2a791213022
Hennekam, Rick
b666d561-4ddd-4212-8275-51ae65c15704
De Lange, Gert J.
747c79fe-ab39-4a60-8792-acf419d4051e
Roberts, Andrew P.
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Yu, Jimin
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Webster, Jody M.
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Yokoyama, Yusuke
d5c2a371-9906-46e3-ad07-1b8791d0c6c1

Rohling, Eelco J., Hibbert, Fiona D., Williams, Felicity H., Grant, Katherine M., Marino, Gianluca, Foster, Gavin L., Hennekam, Rick, De Lange, Gert J., Roberts, Andrew P., Yu, Jimin, Webster, Jody M. and Yokoyama, Yusuke (2017) Differences between the last two glacial maxima and implications for ice-sheet, δ18O, and sea-level reconstructions. Quaternary Science Reviews, 176, 1-28. (doi:10.1016/j.quascirev.2017.09.009).

Record type: Article

Abstract

Studies of past glacial cycles yield critical information about climate and sea-level (ice-volume) variability, including the sensitivity of climate to radiative change, and impacts of crustal rebound on sea-level reconstructions for past interglacials. Here we identify significant differences between the last and penultimate glacial maxima (LGM and PGM) in terms of global volume and distribution of land ice, despite similar temperatures and radiative forcing. Our analysis challenges conventional views of relationships between global ice volume, sea level, seawater oxygen isotope values, and deep-sea temperature, and supports the potential presence of large floating Arctic ice shelves during the PGM. The existence of different glacial ‘modes’ calls for focussed research on the complex processes behind ice-age development. We present a glacioisostatic assessment to demonstrate how a different PGM ice-sheet configuration might affect sea-level estimates for the last interglacial. Results suggest that this may alter existing last interglacial sea-level estimates, which often use an LGM-like ice configuration, by several metres (likely upward).

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Rohling et al_JQSR_2017_263 - Accepted Manuscript
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Accepted/In Press date: 20 September 2017
e-pub ahead of print date: 10 October 2017
Published date: 15 November 2017

Identifiers

Local EPrints ID: 414353
URI: http://eprints.soton.ac.uk/id/eprint/414353
ISSN: 0277-3791
PURE UUID: 5fdb0ffd-71c2-483c-9c10-a9ddf37802d7
ORCID for Eelco J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158
ORCID for Gavin L. Foster: ORCID iD orcid.org/0000-0003-3688-9668

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Date deposited: 27 Sep 2017 16:30
Last modified: 07 Oct 2020 04:27

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Contributors

Author: Fiona D. Hibbert
Author: Felicity H. Williams
Author: Katherine M. Grant
Author: Gianluca Marino
Author: Gavin L. Foster ORCID iD
Author: Rick Hennekam
Author: Gert J. De Lange
Author: Andrew P. Roberts
Author: Jimin Yu
Author: Jody M. Webster
Author: Yusuke Yokoyama

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