Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica
Significantly reduced ice coverage in Greenland and West Antarctica during the warmer-than-present Pliocene could account for ∼10 m of global mean sea level rise. Any sea level increase beyond this would require contributions from the East Antarctic Ice Sheet (EAIS). Previous studies have presented...
Published in: | Earth and Planetary Science Letters |
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Online Access: | http://hdl.handle.net/10261/214717 https://doi.org/10.1016/j.epsl.2018.04.054 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100001509 https://doi.org/10.13039/100008247 https://doi.org/10.13039/501100000780 |
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ftcsic:oai:digital.csic.es:10261/214717 2024-02-11T09:57:24+01:00 Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica Bertram, R. A. Wilson, David J. van de Flierdt, Tina McKay, Robert M. Patterson, M. O. Jiménez Espejo, Francisco J. Escutia, Carlota Duke, G. C. Taylor-Silva, Briar I. Riesselman, Christina R. Royal Society of New Zealand University of Otago Ministerio de Ciencia e Innovación (España) European Commission 2018-05-17 http://hdl.handle.net/10261/214717 https://doi.org/10.1016/j.epsl.2018.04.054 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100001509 https://doi.org/10.13039/100008247 https://doi.org/10.13039/501100000780 unknown Elsevier BV #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P Publisher's version http://dx.doi.org/10.1016/j.epsl.2018.04.054 Sí doi:10.1016/j.epsl.2018.04.054 issn: 0012-821X Earth and Planetary Science Letters 494: 109-116 (2018) http://hdl.handle.net/10261/214717 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100001509 http://dx.doi.org/10.13039/100008247 http://dx.doi.org/10.13039/501100000780 open Provenance Radiogenic isotopes Pliocene Deglacial timescales artículo http://purl.org/coar/resource_type/c_6501 2018 ftcsic https://doi.org/10.1016/j.epsl.2018.04.05410.13039/50110000483710.13039/50110000150910.13039/10000824710.13039/501100000780 2024-01-16T10:55:31Z Significantly reduced ice coverage in Greenland and West Antarctica during the warmer-than-present Pliocene could account for ∼10 m of global mean sea level rise. Any sea level increase beyond this would require contributions from the East Antarctic Ice Sheet (EAIS). Previous studies have presented low-resolution geochemical evidence from the geological record, suggesting repeated ice advance and retreat in low-lying areas of the EAIS such as the Wilkes Subglacial Basin. However, the rates and mechanisms of retreat events are less well constrained. Here we present orbitally-resolved marine detrital sediment provenance data, paired with ice-rafted debris and productivity proxies, during three time intervals from the middle to late Pliocene at IODP Site U1361A, offshore of the Wilkes Subglacial Basin. Our new data reveal that Pliocene shifts in sediment provenance were paralleled by increases in marine productivity, while the onset of such changes was marked by peaks in ice-rafted debris mass accumulation rates. The coincidence of sediment provenance and marine productivity change argues against a switch in sediment delivery between ice streams, and instead suggests that deglacial warming triggered increased rates of iceberg calving, followed by inland retreat of the ice margin. Timescales from the onset of deglaciation to an inland retreated ice margin within the Wilkes Subglacial Basin are on the order of several thousand years. This geological evidence corroborates retreat rates determined from ice sheet modeling, and a contribution of ∼3 to 4 m of equivalent sea level rise from one of the most vulnerable areas of the East Antarctic Ice Sheet during interglacial intervals throughout the middle to late Pliocene. Provenance analysis was supported by a Kristian Gerhard Jebsen PhD Scholarship and NERC UK IODP grants (NE/H025162/1 and NE/H014144/1). Biogenic silica data was supported by a Royal Society of New Zealand Marsden FastStart grant (#UOO-1315) and a University of Otago PhD Scholarship. Support for ... Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Iceberg* West Antarctica Digital.CSIC (Spanish National Research Council) Antarctic East Antarctic Ice Sheet East Antarctica Greenland Jebsen ENVELOPE(-45.683,-45.683,-60.717,-60.717) Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) New Zealand West Antarctica Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) Earth and Planetary Science Letters 494 109 116 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
unknown |
topic |
Provenance Radiogenic isotopes Pliocene Deglacial timescales |
spellingShingle |
Provenance Radiogenic isotopes Pliocene Deglacial timescales Bertram, R. A. Wilson, David J. van de Flierdt, Tina McKay, Robert M. Patterson, M. O. Jiménez Espejo, Francisco J. Escutia, Carlota Duke, G. C. Taylor-Silva, Briar I. Riesselman, Christina R. Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
topic_facet |
Provenance Radiogenic isotopes Pliocene Deglacial timescales |
description |
Significantly reduced ice coverage in Greenland and West Antarctica during the warmer-than-present Pliocene could account for ∼10 m of global mean sea level rise. Any sea level increase beyond this would require contributions from the East Antarctic Ice Sheet (EAIS). Previous studies have presented low-resolution geochemical evidence from the geological record, suggesting repeated ice advance and retreat in low-lying areas of the EAIS such as the Wilkes Subglacial Basin. However, the rates and mechanisms of retreat events are less well constrained. Here we present orbitally-resolved marine detrital sediment provenance data, paired with ice-rafted debris and productivity proxies, during three time intervals from the middle to late Pliocene at IODP Site U1361A, offshore of the Wilkes Subglacial Basin. Our new data reveal that Pliocene shifts in sediment provenance were paralleled by increases in marine productivity, while the onset of such changes was marked by peaks in ice-rafted debris mass accumulation rates. The coincidence of sediment provenance and marine productivity change argues against a switch in sediment delivery between ice streams, and instead suggests that deglacial warming triggered increased rates of iceberg calving, followed by inland retreat of the ice margin. Timescales from the onset of deglaciation to an inland retreated ice margin within the Wilkes Subglacial Basin are on the order of several thousand years. This geological evidence corroborates retreat rates determined from ice sheet modeling, and a contribution of ∼3 to 4 m of equivalent sea level rise from one of the most vulnerable areas of the East Antarctic Ice Sheet during interglacial intervals throughout the middle to late Pliocene. Provenance analysis was supported by a Kristian Gerhard Jebsen PhD Scholarship and NERC UK IODP grants (NE/H025162/1 and NE/H014144/1). Biogenic silica data was supported by a Royal Society of New Zealand Marsden FastStart grant (#UOO-1315) and a University of Otago PhD Scholarship. Support for ... |
author2 |
Royal Society of New Zealand University of Otago Ministerio de Ciencia e Innovación (España) European Commission |
format |
Article in Journal/Newspaper |
author |
Bertram, R. A. Wilson, David J. van de Flierdt, Tina McKay, Robert M. Patterson, M. O. Jiménez Espejo, Francisco J. Escutia, Carlota Duke, G. C. Taylor-Silva, Briar I. Riesselman, Christina R. |
author_facet |
Bertram, R. A. Wilson, David J. van de Flierdt, Tina McKay, Robert M. Patterson, M. O. Jiménez Espejo, Francisco J. Escutia, Carlota Duke, G. C. Taylor-Silva, Briar I. Riesselman, Christina R. |
author_sort |
Bertram, R. A. |
title |
Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
title_short |
Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
title_full |
Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
title_fullStr |
Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
title_full_unstemmed |
Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
title_sort |
pliocene deglacial event timelines and the biogeochemical response offshore wilkes subglacial basin, east antarctica |
publisher |
Elsevier BV |
publishDate |
2018 |
url |
http://hdl.handle.net/10261/214717 https://doi.org/10.1016/j.epsl.2018.04.054 https://doi.org/10.13039/501100004837 https://doi.org/10.13039/501100001509 https://doi.org/10.13039/100008247 https://doi.org/10.13039/501100000780 |
long_lat |
ENVELOPE(-45.683,-45.683,-60.717,-60.717) ENVELOPE(66.067,66.067,-67.867,-67.867) ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Greenland Jebsen Marsden New Zealand West Antarctica Wilkes Subglacial Basin |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Greenland Jebsen Marsden New Zealand West Antarctica Wilkes Subglacial Basin |
genre |
Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Iceberg* West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Iceberg* West Antarctica |
op_relation |
#PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/CTM2014-60451-C2-1-P Publisher's version http://dx.doi.org/10.1016/j.epsl.2018.04.054 Sí doi:10.1016/j.epsl.2018.04.054 issn: 0012-821X Earth and Planetary Science Letters 494: 109-116 (2018) http://hdl.handle.net/10261/214717 http://dx.doi.org/10.13039/501100004837 http://dx.doi.org/10.13039/501100001509 http://dx.doi.org/10.13039/100008247 http://dx.doi.org/10.13039/501100000780 |
op_rights |
open |
op_doi |
https://doi.org/10.1016/j.epsl.2018.04.05410.13039/50110000483710.13039/50110000150910.13039/10000824710.13039/501100000780 |
container_title |
Earth and Planetary Science Letters |
container_volume |
494 |
container_start_page |
109 |
op_container_end_page |
116 |
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1790609699746349056 |