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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ftcdlib:qt0z41x051 2023-05-15T14:01:30+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 Team, SMSS 3453 - 3458 2016-03-29 application/pdf http://www.escholarship.org/uc/item/0z41x051 english eng eScholarship, University of California qt0z41x051 http://www.escholarship.org/uc/item/0z41x051 Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Levy, R; Harwood, D; Florindo, F; Sangiorgi, F; Tripati, R; von Eynatten, H; et al.(2016). Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 113(13), 3453 - 3458. doi:10.1073/pnas.1516030113. UCLA: Retrieved from: http://www.escholarship.org/uc/item/0z41x051 Antarctica ice sheet Climate Optimum Ross Sea Miocene article 2016 ftcdlib https://doi.org/10.1073/pnas.1516030113 2019-04-26T22:52:14Z 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 CO2concentrations 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 CO2concentrations 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 CO2during the early to mid-Miocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ross Sea University of California: eScholarship Antarctic Ross Sea The Antarctic Proceedings of the National Academy of Sciences 113 13 3453 3458 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Antarctica ice sheet Climate Optimum Ross Sea Miocene |
spellingShingle |
Antarctica ice sheet Climate Optimum Ross Sea 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 Team, SMSS Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene |
topic_facet |
Antarctica ice sheet Climate Optimum Ross Sea Miocene |
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 CO2concentrations 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 CO2concentrations 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 CO2during 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 Team, SMSS |
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 Team, SMSS |
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 |
eScholarship, University of California |
publishDate |
2016 |
url |
http://www.escholarship.org/uc/item/0z41x051 |
op_coverage |
3453 - 3458 |
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_source |
Levy, R; Harwood, D; Florindo, F; Sangiorgi, F; Tripati, R; von Eynatten, H; et al.(2016). Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 113(13), 3453 - 3458. doi:10.1073/pnas.1516030113. UCLA: Retrieved from: http://www.escholarship.org/uc/item/0z41x051 |
op_relation |
qt0z41x051 http://www.escholarship.org/uc/item/0z41x051 |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
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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1766271340181979136 |