Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene
Geological records from the Antarctic margin offer direct evidence of environmental variability at high southern latitudes and provide insight regarding ice sheet sensitivity to past climate change. The early to mid-Miocene (23-14 Mya) is a compelling interval to study as global temperatures and atm...
Published in: | Proceedings of the National Academy of Sciences |
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Online Access: | https://digitalcommons.lsu.edu/geo_pubs/1047 https://doi.org/10.1073/pnas.1516030113 https://digitalcommons.lsu.edu/context/geo_pubs/article/2046/viewcontent/1047.pdf |
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-2046 2023-06-11T04:06:33+02:00 Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene Levy, Richard Harwood, David Florindo, Fabio Sangiorgi, Francesca Tripati, Robert von Eynatten, Hilmar Gasson, Edward Kuhn, Gerhard Tripati, Aradhna Deconto, Robert Fielding, Christopher Field, Brad Golledge, Nicholas McKay, Robert Naish, Timothy Olney, Matthew Pollard, David Schouten, Stefan Talarico, Franco Warny, Sophie Willmott, Veronica Acton, Gary Panter, Kurt Paulsen, Timothy Taviani, Marco Askin, Rosemary Atkins, Clifford Bassett, Kari Beu, Alan Blackstone, Brian Browne, Gregory Ceregato, Alessandro Cody, Rosemary 2016-03-29T07:00:00Z application/pdf https://digitalcommons.lsu.edu/geo_pubs/1047 https://doi.org/10.1073/pnas.1516030113 https://digitalcommons.lsu.edu/context/geo_pubs/article/2046/viewcontent/1047.pdf unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/1047 doi:10.1073/pnas.1516030113 https://digitalcommons.lsu.edu/context/geo_pubs/article/2046/viewcontent/1047.pdf Faculty Publications Antarctica Climate Optimum Ice sheet Miocene Ross Sea text 2016 ftlouisianastuir https://doi.org/10.1073/pnas.1516030113 2023-05-28T18:24:49Z Geological records from the Antarctic margin offer direct evidence of environmental variability at high southern latitudes and provide insight regarding ice sheet sensitivity to past climate change. The early to mid-Miocene (23-14 Mya) is a compelling interval to study as global temperatures and atmospheric CO 2 concentrations were similar to those projected for coming centuries. Importantly, this time interval includes the Miocene Climatic Optimum, a period of global warmth during which average surface temperatures were 3-4 °C higher than today. Miocene sediments in the ANDRILL-2A drill core from the Western Ross Sea, Antarctica, indicate that the Antarctic ice sheet (AIS) was highly variable through this key time interval. A multiproxy dataset derived from the core identifies four distinct environmental motifs based on changes in sedimentary facies, fossil assemblages, geochemistry, and paleotemperature. Four major disconformities in the drill core coincide with regional seismic discontinuities and reflect transient expansion of grounded ice across the Ross Sea. They correlate with major positive shifts in benthic oxygen isotope records and generally coincide with intervals when atmospheric CO 2 concentrations were at or below preindustrial levels (∼280 ppm). Five intervals reflect ice sheet minima and air temperatures warm enough for substantial ice mass loss during episodes of high (∼500 ppm) atmospheric CO 2 . These new drill core data and associated ice sheet modeling experiments indicate that polar climate and the AIS were highly sensitive to relatively small changes in atmospheric CO 2 during the early to mid-Miocene. Text Antarc* Antarctic Antarctica Ice Sheet Ross Sea LSU Digital Commons (Louisiana State University) Antarctic The Antarctic Ross Sea Proceedings of the National Academy of Sciences 113 13 3453 3458 |
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Open Polar |
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LSU Digital Commons (Louisiana State University) |
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ftlouisianastuir |
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unknown |
topic |
Antarctica Climate Optimum Ice sheet Miocene Ross Sea |
spellingShingle |
Antarctica Climate Optimum Ice sheet Miocene Ross Sea Levy, Richard Harwood, David Florindo, Fabio Sangiorgi, Francesca Tripati, Robert von Eynatten, Hilmar Gasson, Edward Kuhn, Gerhard Tripati, Aradhna Deconto, Robert Fielding, Christopher Field, Brad Golledge, Nicholas McKay, Robert Naish, Timothy Olney, Matthew Pollard, David Schouten, Stefan Talarico, Franco Warny, Sophie Willmott, Veronica Acton, Gary Panter, Kurt Paulsen, Timothy Taviani, Marco Askin, Rosemary Atkins, Clifford Bassett, Kari Beu, Alan Blackstone, Brian Browne, Gregory Ceregato, Alessandro Cody, Rosemary Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene |
topic_facet |
Antarctica Climate Optimum Ice sheet Miocene Ross Sea |
description |
Geological records from the Antarctic margin offer direct evidence of environmental variability at high southern latitudes and provide insight regarding ice sheet sensitivity to past climate change. The early to mid-Miocene (23-14 Mya) is a compelling interval to study as global temperatures and atmospheric CO 2 concentrations were similar to those projected for coming centuries. Importantly, this time interval includes the Miocene Climatic Optimum, a period of global warmth during which average surface temperatures were 3-4 °C higher than today. Miocene sediments in the ANDRILL-2A drill core from the Western Ross Sea, Antarctica, indicate that the Antarctic ice sheet (AIS) was highly variable through this key time interval. A multiproxy dataset derived from the core identifies four distinct environmental motifs based on changes in sedimentary facies, fossil assemblages, geochemistry, and paleotemperature. Four major disconformities in the drill core coincide with regional seismic discontinuities and reflect transient expansion of grounded ice across the Ross Sea. They correlate with major positive shifts in benthic oxygen isotope records and generally coincide with intervals when atmospheric CO 2 concentrations were at or below preindustrial levels (∼280 ppm). Five intervals reflect ice sheet minima and air temperatures warm enough for substantial ice mass loss during episodes of high (∼500 ppm) atmospheric CO 2 . These new drill core data and associated ice sheet modeling experiments indicate that polar climate and the AIS were highly sensitive to relatively small changes in atmospheric CO 2 during the early to mid-Miocene. |
format |
Text |
author |
Levy, Richard Harwood, David Florindo, Fabio Sangiorgi, Francesca Tripati, Robert von Eynatten, Hilmar Gasson, Edward Kuhn, Gerhard Tripati, Aradhna Deconto, Robert Fielding, Christopher Field, Brad Golledge, Nicholas McKay, Robert Naish, Timothy Olney, Matthew Pollard, David Schouten, Stefan Talarico, Franco Warny, Sophie Willmott, Veronica Acton, Gary Panter, Kurt Paulsen, Timothy Taviani, Marco Askin, Rosemary Atkins, Clifford Bassett, Kari Beu, Alan Blackstone, Brian Browne, Gregory Ceregato, Alessandro Cody, Rosemary |
author_facet |
Levy, Richard Harwood, David Florindo, Fabio Sangiorgi, Francesca Tripati, Robert von Eynatten, Hilmar Gasson, Edward Kuhn, Gerhard Tripati, Aradhna Deconto, Robert Fielding, Christopher Field, Brad Golledge, Nicholas McKay, Robert Naish, Timothy Olney, Matthew Pollard, David Schouten, Stefan Talarico, Franco Warny, Sophie Willmott, Veronica Acton, Gary Panter, Kurt Paulsen, Timothy Taviani, Marco Askin, Rosemary Atkins, Clifford Bassett, Kari Beu, Alan Blackstone, Brian Browne, Gregory Ceregato, Alessandro Cody, Rosemary |
author_sort |
Levy, Richard |
title |
Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene |
title_short |
Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene |
title_full |
Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene |
title_fullStr |
Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene |
title_full_unstemmed |
Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene |
title_sort |
antarctic ice sheet sensitivity to atmospheric co 2 variations in the early to mid-miocene |
publisher |
LSU Digital Commons |
publishDate |
2016 |
url |
https://digitalcommons.lsu.edu/geo_pubs/1047 https://doi.org/10.1073/pnas.1516030113 https://digitalcommons.lsu.edu/context/geo_pubs/article/2046/viewcontent/1047.pdf |
geographic |
Antarctic The Antarctic Ross Sea |
geographic_facet |
Antarctic The Antarctic Ross Sea |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/1047 doi:10.1073/pnas.1516030113 https://digitalcommons.lsu.edu/context/geo_pubs/article/2046/viewcontent/1047.pdf |
op_doi |
https://doi.org/10.1073/pnas.1516030113 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
113 |
container_issue |
13 |
container_start_page |
3453 |
op_container_end_page |
3458 |
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1768378559301156864 |