Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene
Geological records from the Antarctic margin offer direct evidenceof environmental variability at high southern latitudes and provideinsight regarding ice sheet sensitivity to past climate change.The early to mid-Miocene (23–14 Mya) is a compelling interval tostudy as global temperatures and atmosph...
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ftnioz:oai:imis.nioz.nl:255273 2023-05-15T13:47:57+02:00 Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene Levy, R. Schouten, S. SMS Sci Team 2016 http://imis.nioz.nl/imis.php?module=ref&refid=255273 en eng info:eu-repo/semantics/altIdentifier/wos/000372876400036 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1073/pnas.1516030113 http://imis.nioz.nl/imis.php?module=ref&refid=255273 info:eu-repo/semantics/closedAccess %3Ci%3EProc.+Natl.+Acad.+Sci.+U.S.A.+113%2813%29%3C%2Fi%3E%3A+3453%E2%80%933458.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1073%2Fpnas.1516030113%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1073%2Fpnas.1516030113%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2016 ftnioz https://doi.org/10.1073/pnas.1516030113 2022-05-01T14:03:23Z Geological records from the Antarctic margin offer direct evidenceof environmental variability at high southern latitudes and provideinsight regarding ice sheet sensitivity to past climate change.The early to mid-Miocene (23–14 Mya) is a compelling interval tostudy as global temperatures and atmospheric CO2 concentrationswere similar to those projected for coming centuries. Importantly,this time interval includes the Miocene Climatic Optimum, a periodof global warmth during which average surface temperatures were3–4 °C higher than today. Miocene sediments in the ANDRILL-2A drillcore from the Western Ross Sea, Antarctica, indicate that the Antarcticice sheet (AIS) was highly variable through this key time interval.A multiproxy dataset derived from the core identifies four distinctenvironmental motifs based on changes in sedimentary facies, fossilassemblages, geochemistry, and paleotemperature. Four major disconformitiesin the drill core coincide with regional seismic discontinuitiesand reflect transient expansion of grounded ice across theRoss Sea. They correlate with major positive shifts in benthic oxygenisotope records and generally coincide with intervals when atmosphericCO2 concentrations were at or below preindustrial levels(~280 ppm). Five intervals reflect ice sheet minima and air temperatureswarm enough for substantial ice mass loss during episodes ofhigh (~500 ppm) atmospheric CO2. These new drill core data andassociated ice sheet modeling experiments indicate that polar climateand the AIS were highly sensitive to relatively small changes in atmosphericCO2 during the early to mid-Miocene. Article in Journal/Newspaper Antarc* Antarctic Antarctica Ice Sheet Ross Sea NIOZ Repository (Royal Netherlands Institute for Sea Research) Antarctic Ross Sea The Antarctic Proceedings of the National Academy of Sciences 113 13 3453 3458 |
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NIOZ Repository (Royal Netherlands Institute for Sea Research) |
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ftnioz |
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English |
description |
Geological records from the Antarctic margin offer direct evidenceof environmental variability at high southern latitudes and provideinsight regarding ice sheet sensitivity to past climate change.The early to mid-Miocene (23–14 Mya) is a compelling interval tostudy as global temperatures and atmospheric CO2 concentrationswere similar to those projected for coming centuries. Importantly,this time interval includes the Miocene Climatic Optimum, a periodof global warmth during which average surface temperatures were3–4 °C higher than today. Miocene sediments in the ANDRILL-2A drillcore from the Western Ross Sea, Antarctica, indicate that the Antarcticice sheet (AIS) was highly variable through this key time interval.A multiproxy dataset derived from the core identifies four distinctenvironmental motifs based on changes in sedimentary facies, fossilassemblages, geochemistry, and paleotemperature. Four major disconformitiesin the drill core coincide with regional seismic discontinuitiesand reflect transient expansion of grounded ice across theRoss Sea. They correlate with major positive shifts in benthic oxygenisotope records and generally coincide with intervals when atmosphericCO2 concentrations were at or below preindustrial levels(~280 ppm). Five intervals reflect ice sheet minima and air temperatureswarm enough for substantial ice mass loss during episodes ofhigh (~500 ppm) atmospheric CO2. These new drill core data andassociated ice sheet modeling experiments indicate that polar climateand the AIS were highly sensitive to relatively small changes in atmosphericCO2 during the early to mid-Miocene. |
format |
Article in Journal/Newspaper |
author |
Levy, R. Schouten, S. SMS Sci Team |
spellingShingle |
Levy, R. Schouten, S. SMS Sci Team Antarctic ice sheet sensitivity to atmospheric CO 2 variations in the early to mid-Miocene |
author_facet |
Levy, R. Schouten, S. SMS Sci Team |
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://imis.nioz.nl/imis.php?module=ref&refid=255273 |
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 |
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info:eu-repo/semantics/altIdentifier/wos/000372876400036 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1073/pnas.1516030113 http://imis.nioz.nl/imis.php?module=ref&refid=255273 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1073/pnas.1516030113 |
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Proceedings of the National Academy of Sciences |
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113 |
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13 |
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3453 |
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