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Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition

Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition
Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition
About 34 million years ago (Ma) Earth’s climate cooled and an ice sheet formed on Antarctica as atmospheric CO2 fell below ~750 ppm. Sedimentary cycles from a drill core in western Ross Sea provide the first direct evidence of orbitally-controlled glacial cycles between 34–31 Ma. Initially, under atmospheric CO2 levels ? 600 ppm, a smaller Antarctic Ice Sheet, (AIS) restricted to the terrestrial continent, was highly responsive to local insolation forcing. A more stable, continental-scale ice sheet calving at the coastline, did not form until ~32.8 Ma coincident with the first time atmospheric CO2 levels fell below ~600 ppm. Our results provide new insights into the potential of the AIS for threshold behavior, and its sensitivity to atmospheric CO2 concentrations above present day levels.
0036-8075
76-80
Galeotti, S.
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DeConto, R.
892a0cf3-ef2a-46af-9c09-0e283b7222d7
Naish, T.
b142ab33-3fd9-4baf-ba1f-fafa9b6a3b45
Stocchi, P.
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Florindo, F.
8782f358-6dd8-4531-aaf1-4e1e859d52db
Pagani, M.
577ac082-4db7-4f85-8213-c45df17acd01
Barrett, P.
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Bohaty, S.M.
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Lanci, L.
0905f57d-d835-49c9-9356-efc950a171db
Pollard, D.
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Sandroni, S.
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Talarico, F. M.
db84ac54-3ec4-4699-bc6e-44d5e4012ff8
Zachos, J. C.
96b597cd-39d3-44ca-91e7-74dac4a9089a
Galeotti, S.
a819e457-9ed5-4fa0-96ae-7df8223171fa
DeConto, R.
892a0cf3-ef2a-46af-9c09-0e283b7222d7
Naish, T.
b142ab33-3fd9-4baf-ba1f-fafa9b6a3b45
Stocchi, P.
bdd13c0c-ee5b-4b6f-9634-f53e44e51822
Florindo, F.
8782f358-6dd8-4531-aaf1-4e1e859d52db
Pagani, M.
577ac082-4db7-4f85-8213-c45df17acd01
Barrett, P.
6708ce04-ccc1-4804-ac9d-b0f8e6525d19
Bohaty, S.M.
af9dbe78-8b9f-44f2-ba1d-20795837d2d1
Lanci, L.
0905f57d-d835-49c9-9356-efc950a171db
Pollard, D.
b1f740b1-6f85-4865-b2fc-632114c76dc2
Sandroni, S.
3cdf073a-74d0-42ed-ac80-7c4db7802ae5
Talarico, F. M.
db84ac54-3ec4-4699-bc6e-44d5e4012ff8
Zachos, J. C.
96b597cd-39d3-44ca-91e7-74dac4a9089a

Galeotti, S., DeConto, R., Naish, T., Stocchi, P., Florindo, F., Pagani, M., Barrett, P., Bohaty, S.M., Lanci, L., Pollard, D., Sandroni, S., Talarico, F. M. and Zachos, J. C. (2016) Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition. Science, 352 (6281), 76-80. (doi:10.1126/science.aab0669).

Record type: Article

Abstract

About 34 million years ago (Ma) Earth’s climate cooled and an ice sheet formed on Antarctica as atmospheric CO2 fell below ~750 ppm. Sedimentary cycles from a drill core in western Ross Sea provide the first direct evidence of orbitally-controlled glacial cycles between 34–31 Ma. Initially, under atmospheric CO2 levels ? 600 ppm, a smaller Antarctic Ice Sheet, (AIS) restricted to the terrestrial continent, was highly responsive to local insolation forcing. A more stable, continental-scale ice sheet calving at the coastline, did not form until ~32.8 Ma coincident with the first time atmospheric CO2 levels fell below ~600 ppm. Our results provide new insights into the potential of the AIS for threshold behavior, and its sensitivity to atmospheric CO2 concentrations above present day levels.

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Galeotti_et_al_2016_accepted_version_comb.pdf - Accepted Manuscript
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Accepted/In Press date: 24 February 2016
e-pub ahead of print date: 10 March 2016
Published date: 1 April 2016
Organisations: Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 393827
URI: http://eprints.soton.ac.uk/id/eprint/393827
ISSN: 0036-8075
PURE UUID: 63965ce9-9beb-4e28-b4fd-e09e4720d45e
ORCID for S.M. Bohaty: ORCID iD orcid.org/0000-0002-1193-7398

Catalogue record

Date deposited: 05 May 2016 12:52
Last modified: 20 Feb 2021 02:40

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