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Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand

Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand
Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand
The last interglacial (LIG; ~130 to ~118 thousand years ago, ka) was the last time global sea level rose well above the present level. Greenland Ice Sheet (GrIS) contributions were insufficient to explain the highstand, so that substantial Antarctic Ice Sheet (AIS) reduction is implied. However, the nature and drivers of GrIS and AIS reductions remain enigmatic, even though they may be critical for understanding future sea-level rise. Here we complement existing records with new data, and reveal that the LIG contained an AIS-derived highstand from ~129.5 to ~125 ka, a lowstand centred on 125–124 ka, and joint AIS + GrIS contributions from ~123.5 to ~118 ka. Moreover, a dual substructure within the first highstand suggests temporal variability in the AIS contributions. Implied rates of sea-level rise are high (up to several meters per century; m c−1), and lend credibility to high rates inferred by ice modelling under certain ice-shelf instability parameterisations.
2041-1723
Rohling, Eelco
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Hibbert, Fiona D.
3f092d9e-62dc-49e7-bf1e-ab61d81423ec
Grant, Katharine M.
90485a09-de9a-445e-b229-10c44f14ef00
Galaasen, Eirik V.
8158d010-e03d-4489-9d39-a66ac792dd6d
Irvalı, Nil
99b5f346-58e1-49da-a166-f509bbcefcb5
Kleiven, Helga F.
09f9e3ab-e58b-4981-84ad-0168a40ed072
Marino, Gianluca
40d6f3f2-0905-4c0f-8eb9-6d577b2833bb
Ninnemann, Ulysses
2bcb8ec3-4747-4059-b330-8a5ce2a8d421
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Rosenthal, Yair
0130f66f-7653-490b-b323-76956e66c9e1
Schulz, Hartmut
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Williams, Felicity
14fedc63-335b-4718-a828-7577f0070b76
Yu, Jimin
9558e475-ac9f-44d3-8c1a-b0540e3b7c3d
Rohling, Eelco
a2a27ef2-fcce-4c71-907b-e692b5ecc685
Hibbert, Fiona D.
3f092d9e-62dc-49e7-bf1e-ab61d81423ec
Grant, Katharine M.
90485a09-de9a-445e-b229-10c44f14ef00
Galaasen, Eirik V.
8158d010-e03d-4489-9d39-a66ac792dd6d
Irvalı, Nil
99b5f346-58e1-49da-a166-f509bbcefcb5
Kleiven, Helga F.
09f9e3ab-e58b-4981-84ad-0168a40ed072
Marino, Gianluca
40d6f3f2-0905-4c0f-8eb9-6d577b2833bb
Ninnemann, Ulysses
2bcb8ec3-4747-4059-b330-8a5ce2a8d421
Roberts, Andrew P.
4f062491-5408-4edb-8dd1-140c6a42e93f
Rosenthal, Yair
0130f66f-7653-490b-b323-76956e66c9e1
Schulz, Hartmut
6c3b4ed9-64bc-48b3-958b-59a2a291eb12
Williams, Felicity
14fedc63-335b-4718-a828-7577f0070b76
Yu, Jimin
9558e475-ac9f-44d3-8c1a-b0540e3b7c3d

Rohling, Eelco, Hibbert, Fiona D., Grant, Katharine M., Galaasen, Eirik V., Irvalı, Nil, Kleiven, Helga F., Marino, Gianluca, Ninnemann, Ulysses, Roberts, Andrew P., Rosenthal, Yair, Schulz, Hartmut, Williams, Felicity and Yu, Jimin (2019) Asynchronous Antarctic and Greenland ice-volume contributions to the last interglacial sea-level highstand. Nature Communications, 10. (doi:10.1038/s41467-019-12874-3).

Record type: Article

Abstract

The last interglacial (LIG; ~130 to ~118 thousand years ago, ka) was the last time global sea level rose well above the present level. Greenland Ice Sheet (GrIS) contributions were insufficient to explain the highstand, so that substantial Antarctic Ice Sheet (AIS) reduction is implied. However, the nature and drivers of GrIS and AIS reductions remain enigmatic, even though they may be critical for understanding future sea-level rise. Here we complement existing records with new data, and reveal that the LIG contained an AIS-derived highstand from ~129.5 to ~125 ka, a lowstand centred on 125–124 ka, and joint AIS + GrIS contributions from ~123.5 to ~118 ka. Moreover, a dual substructure within the first highstand suggests temporal variability in the AIS contributions. Implied rates of sea-level rise are high (up to several meters per century; m c−1), and lend credibility to high rates inferred by ice modelling under certain ice-shelf instability parameterisations.

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Rohling et al_Nature Comms 2019 as accepted - Accepted Manuscript
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Accepted/In Press date: 7 October 2019
e-pub ahead of print date: 6 November 2019

Identifiers

Local EPrints ID: 435540
URI: https://eprints.soton.ac.uk/id/eprint/435540
ISSN: 2041-1723
PURE UUID: 90eb89d7-66e8-49bf-9f2e-33d1089ca60a
ORCID for Eelco Rohling: ORCID iD orcid.org/0000-0001-5349-2158

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Date deposited: 08 Nov 2019 17:30
Last modified: 09 Nov 2019 01:38

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Contributors

Author: Eelco Rohling ORCID iD
Author: Fiona D. Hibbert
Author: Katharine M. Grant
Author: Eirik V. Galaasen
Author: Nil Irvalı
Author: Helga F. Kleiven
Author: Gianluca Marino
Author: Ulysses Ninnemann
Author: Andrew P. Roberts
Author: Yair Rosenthal
Author: Hartmut Schulz
Author: Felicity Williams
Author: Jimin Yu

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