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.
76-80
Galeotti, S.
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DeConto, R.
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Naish, T.
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Stocchi, P.
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Florindo, F.
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Pagani, M.
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Barrett, P.
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Bohaty, S.M.
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Lanci, L.
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Pollard, D.
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Sandroni, S.
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Talarico, F. M.
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Zachos, J. C.
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1 April 2016
Galeotti, S.
a819e457-9ed5-4fa0-96ae-7df8223171fa
DeConto, R.
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Naish, T.
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Stocchi, P.
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Florindo, F.
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Pagani, M.
577ac082-4db7-4f85-8213-c45df17acd01
Barrett, P.
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Bohaty, S.M.
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Lanci, L.
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Pollard, D.
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Sandroni, S.
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Talarico, F. M.
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Zachos, J. C.
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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), .
(doi:10.1126/science.aab0669).
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
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More information
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
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Date deposited: 05 May 2016 12:52
Last modified: 15 Mar 2024 03:27
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Contributors
Author:
S. Galeotti
Author:
R. DeConto
Author:
T. Naish
Author:
P. Stocchi
Author:
F. Florindo
Author:
M. Pagani
Author:
P. Barrett
Author:
L. Lanci
Author:
D. Pollard
Author:
S. Sandroni
Author:
F. M. Talarico
Author:
J. C. Zachos
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