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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Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2016
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Subjects: | |
Online Access: | http://hdl.handle.net/11365/1081963 https://doi.org/10.1073/pnas.1516030113 http://www.pnas.org/content/113/13/3453.full.pdf |
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Università degli Studi di Siena: USiena air |
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English |
topic |
Antarctica Climate Optimum Ice sheet Miocene Ross Sea |
spellingShingle |
Antarctica Climate Optimum Ice sheet Miocene Ross Sea 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. Askin R. Atkins C. Bassett K. Beu A. Blackstone B. Browne G. Ceregato A. Cody R. Cornamusini G. Corrado S. Del Carlo P. Di Vincenzo G. Dunbar G. Falk C. Frank T. Giorgetti G. Grelle T. Gui Z. Handwerger D. Hannah M. Harwood D. M. Hauptvogel D. Hayden T. Henrys S. Hoffmann S. Iacoviello F. Ishman S. Jarrard R. Johnson K. Jovane L. Judge S. Kominz M. Konfirst M. Krissek L. Lacy L. Maffioli P. Magens D. Marcano M. C. Millan C. Mohr B. Montone P. Mukasa S. Niessen F. Ohneiser C. Passchier S. Patterson M. Pekar S. Pierdominici S. Raine I. Reed J. Reichelt L. Riesselman C. Rocchi S. Sagnotti L. Sandroni S. Schmitt D. Speece M. Storey B. Strada E. Tuzzi E. Verosub K. Wilson G. Wilson T. Wonik T. Zattin M. 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 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. |
author2 |
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. Askin, R. Atkins, C. Bassett, K. Beu, A. Blackstone, B. Browne, G. Ceregato, A. Cody, R. Cornamusini, G. Corrado, S. Del Carlo, P. Di Vincenzo, G. Dunbar, G. Falk, C. Frank, T. Giorgetti, G. Grelle, T. Gui, Z. Handwerger, D. Hannah, M. Harwood, D. M. Hauptvogel, D. Hayden, T. Henrys, S. Hoffmann, S. |
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. Askin R. Atkins C. Bassett K. Beu A. Blackstone B. Browne G. Ceregato A. Cody R. Cornamusini G. Corrado S. Del Carlo P. Di Vincenzo G. Dunbar G. Falk C. Frank T. Giorgetti G. Grelle T. Gui Z. Handwerger D. Hannah M. Harwood D. M. Hauptvogel D. Hayden T. Henrys S. Hoffmann S. Iacoviello F. Ishman S. Jarrard R. Johnson K. Jovane L. Judge S. Kominz M. Konfirst M. Krissek L. Lacy L. Maffioli P. Magens D. Marcano M. C. Millan C. Mohr B. Montone P. Mukasa S. Niessen F. Ohneiser C. Passchier S. Patterson M. Pekar S. Pierdominici S. Raine I. Reed J. Reichelt L. Riesselman C. Rocchi S. Sagnotti L. Sandroni S. Schmitt D. Speece M. Storey B. Strada E. Tuzzi E. Verosub K. Wilson G. Wilson T. Wonik T. Zattin M. |
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. Askin R. Atkins C. Bassett K. Beu A. Blackstone B. Browne G. Ceregato A. Cody R. Cornamusini G. Corrado S. Del Carlo P. Di Vincenzo G. Dunbar G. Falk C. Frank T. Giorgetti G. Grelle T. Gui Z. Handwerger D. Hannah M. Harwood D. M. Hauptvogel D. Hayden T. Henrys S. Hoffmann S. Iacoviello F. Ishman S. Jarrard R. Johnson K. Jovane L. Judge S. Kominz M. Konfirst M. Krissek L. Lacy L. Maffioli P. Magens D. Marcano M. C. Millan C. Mohr B. Montone P. Mukasa S. Niessen F. Ohneiser C. Passchier S. Patterson M. Pekar S. Pierdominici S. Raine I. Reed J. Reichelt L. Riesselman C. Rocchi S. Sagnotti L. Sandroni S. Schmitt D. Speece M. Storey B. Strada E. Tuzzi E. Verosub K. Wilson G. Wilson T. Wonik T. Zattin M. |
author_sort |
Levy R. |
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 |
publishDate |
2016 |
url |
http://hdl.handle.net/11365/1081963 https://doi.org/10.1073/pnas.1516030113 http://www.pnas.org/content/113/13/3453.full.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_relation |
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op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1073/pnas.1516030113 |
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Proceedings of the National Academy of Sciences |
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ftunivsiena:oai:usiena-air.unisi.it:11365/1081963 2024-04-14T08:03:56+00:00 Antarctic ice sheet sensitivity to atmospheric CO 2 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. Askin R. Atkins C. Bassett K. Beu A. Blackstone B. Browne G. Ceregato A. Cody R. Cornamusini G. Corrado S. Del Carlo P. Di Vincenzo G. Dunbar G. Falk C. Frank T. Giorgetti G. Grelle T. Gui Z. Handwerger D. Hannah M. Harwood D. M. Hauptvogel D. Hayden T. Henrys S. Hoffmann S. Iacoviello F. Ishman S. Jarrard R. Johnson K. Jovane L. Judge S. Kominz M. Konfirst M. Krissek L. Lacy L. Maffioli P. Magens D. Marcano M. C. Millan C. Mohr B. Montone P. Mukasa S. Niessen F. Ohneiser C. Passchier S. Patterson M. Pekar S. Pierdominici S. Raine I. Reed J. Reichelt L. Riesselman C. Rocchi S. Sagnotti L. Sandroni S. Schmitt D. Speece M. Storey B. Strada E. Tuzzi E. Verosub K. Wilson G. Wilson T. Wonik T. Zattin M. 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. Askin, R. Atkins, C. Bassett, K. Beu, A. Blackstone, B. Browne, G. Ceregato, A. Cody, R. Cornamusini, G. Corrado, S. Del Carlo, P. Di Vincenzo, G. Dunbar, G. Falk, C. Frank, T. Giorgetti, G. Grelle, T. Gui, Z. Handwerger, D. Hannah, M. Harwood, D. M. Hauptvogel, D. Hayden, T. Henrys, S. Hoffmann, S. 2016 STAMPA http://hdl.handle.net/11365/1081963 https://doi.org/10.1073/pnas.1516030113 http://www.pnas.org/content/113/13/3453.full.pdf eng eng info:eu-repo/semantics/altIdentifier/pmid/26903644 info:eu-repo/semantics/altIdentifier/wos/WOS:000372876400036 volume:113 issue:13 firstpage:3453 lastpage:3458 numberofpages:6 journal:PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA http://hdl.handle.net/11365/1081963 doi:10.1073/pnas.1516030113 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84962183310 http://www.pnas.org/content/113/13/3453.full.pdf info:eu-repo/semantics/openAccess Antarctica Climate Optimum Ice sheet Miocene Ross Sea info:eu-repo/semantics/article 2016 ftunivsiena https://doi.org/10.1073/pnas.1516030113 2024-03-21T16:07:18Z 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 Università degli Studi di Siena: USiena air Antarctic The Antarctic Ross Sea Proceedings of the National Academy of Sciences 113 13 3453 3458 |