Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition
About 34 million years ago, Earth's climate cooled and an ice sheet formed on Antarctica as atmospheric carbon dioxide (CO2) fell below ~750 parts per million (ppm). Sedimentary cycles from a drill core in the western Ross Sea provide direct evidence of orbitally controlled glacial cycles betwe...
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Online Access: | http://hdl.handle.net/11576/2632475 https://doi.org/10.1126/science.aab0669 |
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ftunivurbino:oai:ora.uniurb.it:11576/2632475 2024-04-21T07:52:35+00:00 Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition GALEOTTI, SIMONE Deconto, Robert Naish, Timothy Stocchi, Paolo Florindo, Fabio Pagani, Mark Barrett, Peter Bohaty, Steven M LANCI, LUCA Pollard, David Sandroni, Sonia Talarico, Franco M Zachos, James C. Galeotti, Simone Deconto, Robert Naish, Timothy Stocchi, Paolo Florindo, Fabio Pagani, Mark Barrett, Peter Bohaty, Steven M Lanci, Luca Pollard, David Sandroni, Sonia Talarico, Franco M Zachos, James C. 2016 STAMPA http://hdl.handle.net/11576/2632475 https://doi.org/10.1126/science.aab0669 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000373039600038 volume:352 issue:6281 firstpage:76-80 lastpage:80 journal:SCIENCE http://hdl.handle.net/11576/2632475 doi:10.1126/science.aab0669 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84960893029 info:eu-repo/semantics/article 2016 ftunivurbino https://doi.org/10.1126/science.aab0669 2024-03-28T01:08:21Z About 34 million years ago, Earth's climate cooled and an ice sheet formed on Antarctica as atmospheric carbon dioxide (CO2) fell below ~750 parts per million (ppm). Sedimentary cycles from a drill core in the western Ross Sea provide direct evidence of orbitally controlled glacial cycles between 34 million and 31 million years ago. Initially, under atmospheric CO2 levels of ≥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 million years ago, coincident with the earliest time that atmospheric CO2 levels fell below ~600 ppm. Our results provide insight into the potential of the AIS for threshold behavior and have implications for its sensitivity to atmospheric CO2 concentrations above present-day levels. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ross Sea Università degli Studi di Urbino: CINECA IRIS Science 352 6281 76 80 |
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Open Polar |
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Università degli Studi di Urbino: CINECA IRIS |
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ftunivurbino |
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English |
description |
About 34 million years ago, Earth's climate cooled and an ice sheet formed on Antarctica as atmospheric carbon dioxide (CO2) fell below ~750 parts per million (ppm). Sedimentary cycles from a drill core in the western Ross Sea provide direct evidence of orbitally controlled glacial cycles between 34 million and 31 million years ago. Initially, under atmospheric CO2 levels of ≥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 million years ago, coincident with the earliest time that atmospheric CO2 levels fell below ~600 ppm. Our results provide insight into the potential of the AIS for threshold behavior and have implications for its sensitivity to atmospheric CO2 concentrations above present-day levels. |
author2 |
Galeotti, Simone Deconto, Robert Naish, Timothy Stocchi, Paolo Florindo, Fabio Pagani, Mark Barrett, Peter Bohaty, Steven M Lanci, Luca Pollard, David Sandroni, Sonia Talarico, Franco M Zachos, James C. |
format |
Article in Journal/Newspaper |
author |
GALEOTTI, SIMONE Deconto, Robert Naish, Timothy Stocchi, Paolo Florindo, Fabio Pagani, Mark Barrett, Peter Bohaty, Steven M LANCI, LUCA Pollard, David Sandroni, Sonia Talarico, Franco M Zachos, James C. |
spellingShingle |
GALEOTTI, SIMONE Deconto, Robert Naish, Timothy Stocchi, Paolo Florindo, Fabio Pagani, Mark Barrett, Peter Bohaty, Steven M LANCI, LUCA Pollard, David Sandroni, Sonia Talarico, Franco M Zachos, James C. Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition |
author_facet |
GALEOTTI, SIMONE Deconto, Robert Naish, Timothy Stocchi, Paolo Florindo, Fabio Pagani, Mark Barrett, Peter Bohaty, Steven M LANCI, LUCA Pollard, David Sandroni, Sonia Talarico, Franco M Zachos, James C. |
author_sort |
GALEOTTI, SIMONE |
title |
Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition |
title_short |
Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition |
title_full |
Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition |
title_fullStr |
Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition |
title_full_unstemmed |
Antarctic Ice Sheet variability across the Eocene-Oligocene boundary climate transition |
title_sort |
antarctic ice sheet variability across the eocene-oligocene boundary climate transition |
publishDate |
2016 |
url |
http://hdl.handle.net/11576/2632475 https://doi.org/10.1126/science.aab0669 |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000373039600038 volume:352 issue:6281 firstpage:76-80 lastpage:80 journal:SCIENCE http://hdl.handle.net/11576/2632475 doi:10.1126/science.aab0669 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84960893029 |
op_doi |
https://doi.org/10.1126/science.aab0669 |
container_title |
Science |
container_volume |
352 |
container_issue |
6281 |
container_start_page |
76 |
op_container_end_page |
80 |
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1796935805404446720 |