Antarctic ice sheet sensitivity to atmospheric CO2 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...
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Online Access: | https://eprints.whiterose.ac.uk/98017/ https://eprints.whiterose.ac.uk/98017/1/Levy_Resubmission.pdf https://doi.org/10.1073/pnas.1516030113 |
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ftleedsuniv:oai:eprints.whiterose.ac.uk:98017 2023-05-15T13:55:00+02:00 Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene Levy, R. Harwood, D. Florindo, F. Sangiorgi, F. Tripati, R. von Eynatten, H. Gasson, E. Kuhn, G. Tripati, A. DeConto, R. Fielding, C. Field, B. Golledge, N. McKay, R. Naish, T. Olney, M. Pollard, D. Schouten, S. Talarico, F. Warny, S. Willmott, V. Acton, G. Panter, K. Paulsen, T. Taviani, M. SMS Science Team 2016-03-29 text https://eprints.whiterose.ac.uk/98017/ https://eprints.whiterose.ac.uk/98017/1/Levy_Resubmission.pdf https://doi.org/10.1073/pnas.1516030113 en eng National Academy of Sciences https://eprints.whiterose.ac.uk/98017/1/Levy_Resubmission.pdf Levy, R., Harwood, D., Florindo, F. et al. (23 more authors) (2016) Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene. Proceedings of the National Academy of Sciences, 113 (13). pp. 3453-3458. ISSN 1091-6490 Article PeerReviewed 2016 ftleedsuniv https://doi.org/10.1073/pnas.1516030113 2023-01-30T21:41:14Z 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 CO2 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 CO2 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 CO2. 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 CO2 during the early to mid-Miocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ross Sea White Rose Research Online (Universities of Leeds, Sheffield & York) Antarctic Ross Sea The Antarctic Proceedings of the National Academy of Sciences 113 13 3453 3458 |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
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ftleedsuniv |
language |
English |
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 CO2 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 CO2 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 CO2. 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 CO2 during the early to mid-Miocene. |
format |
Article in Journal/Newspaper |
author |
Levy, R. Harwood, D. Florindo, F. Sangiorgi, F. Tripati, R. von Eynatten, H. Gasson, E. Kuhn, G. Tripati, A. DeConto, R. Fielding, C. Field, B. Golledge, N. McKay, R. Naish, T. Olney, M. Pollard, D. Schouten, S. Talarico, F. Warny, S. Willmott, V. Acton, G. Panter, K. Paulsen, T. Taviani, M. SMS Science Team |
spellingShingle |
Levy, R. Harwood, D. Florindo, F. Sangiorgi, F. Tripati, R. von Eynatten, H. Gasson, E. Kuhn, G. Tripati, A. DeConto, R. Fielding, C. Field, B. Golledge, N. McKay, R. Naish, T. Olney, M. Pollard, D. Schouten, S. Talarico, F. Warny, S. Willmott, V. Acton, G. Panter, K. Paulsen, T. Taviani, M. SMS Science Team Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene |
author_facet |
Levy, R. Harwood, D. Florindo, F. Sangiorgi, F. Tripati, R. von Eynatten, H. Gasson, E. Kuhn, G. Tripati, A. DeConto, R. Fielding, C. Field, B. Golledge, N. McKay, R. Naish, T. Olney, M. Pollard, D. Schouten, S. Talarico, F. Warny, S. Willmott, V. Acton, G. Panter, K. Paulsen, T. Taviani, M. SMS Science Team |
author_sort |
Levy, R. |
title |
Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene |
title_short |
Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene |
title_full |
Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene |
title_fullStr |
Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene |
title_full_unstemmed |
Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene |
title_sort |
antarctic ice sheet sensitivity to atmospheric co2 variations in the early to mid-miocene |
publisher |
National Academy of Sciences |
publishDate |
2016 |
url |
https://eprints.whiterose.ac.uk/98017/ https://eprints.whiterose.ac.uk/98017/1/Levy_Resubmission.pdf https://doi.org/10.1073/pnas.1516030113 |
geographic |
Antarctic Ross Sea The Antarctic |
geographic_facet |
Antarctic Ross Sea The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea |
op_relation |
https://eprints.whiterose.ac.uk/98017/1/Levy_Resubmission.pdf Levy, R., Harwood, D., Florindo, F. et al. (23 more authors) (2016) Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene. Proceedings of the National Academy of Sciences, 113 (13). pp. 3453-3458. ISSN 1091-6490 |
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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1766261223748272128 |