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:oai:escholarship.org:ark:/13030/qt0z41x051 2023-05-15T13:38:28+02:00 Antarctic ice sheet sensitivity to atmospheric CO2 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 SMS Science Team 3453 - 3458 2016-03-01 application/pdf https://escholarship.org/uc/item/0z41x051 unknown eScholarship, University of California qt0z41x051 https://escholarship.org/uc/item/0z41x051 CC-BY CC-BY Proceedings of the National Academy of Sciences of the United States of America, vol 113, iss 13 SMS Science Team Antarctica Climate Optimum Miocene Ross Sea ice sheet Climate Action article 2016 ftcdlib 2022-12-19T18:37:13Z 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 Sea ice University of California: eScholarship Antarctic Ross Sea The Antarctic |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
SMS Science Team Antarctica Climate Optimum Miocene Ross Sea ice sheet Climate Action |
spellingShingle |
SMS Science Team Antarctica Climate Optimum Miocene Ross Sea ice sheet Climate Action 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 SMS Science Team Antarctic ice sheet sensitivity to atmospheric CO2 variations in the early to mid-Miocene. |
topic_facet |
SMS Science Team Antarctica Climate Optimum Miocene Ross Sea ice sheet Climate Action |
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, 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 SMS Science Team |
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 SMS Science Team |
author_sort |
Levy, Richard |
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 |
https://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 Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ross Sea Sea ice |
op_source |
Proceedings of the National Academy of Sciences of the United States of America, vol 113, iss 13 |
op_relation |
qt0z41x051 https://escholarship.org/uc/item/0z41x051 |
op_rights |
CC-BY |
op_rightsnorm |
CC-BY |
_version_ |
1766106578249842688 |