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 ~10m 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 l...
Published in: | Earth and Planetary Science Letters |
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ftimperialcol:oai:spiral.imperial.ac.uk:10044/1/59325 2023-05-15T14:02:50+02:00 Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica Bertram, RA Wilson, DJ Van de Flierdt, T McKay, RM Patterson, MO Jimenez-Espejo, FJ Escutia, C Duke, G Taylor-Silva, B Riesselman, C Natural Environment Research Council (NERC) Natural Environment Research Council (NERC) 2018-04-27 http://hdl.handle.net/10044/1/59325 https://doi.org/10.1016/j.epsl.2018.04.054 unknown Elsevier Earth and Planetary Science Letters ©2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). CC-BY 116 109 Science & Technology Physical Sciences Geochemistry & Geophysics East Antarctic Ice Sheet Wilkes Subglacial Basin provenance radiogenic isotopes Pliocene deglacial timescales GLACIAL-INTERGLACIAL CYCLES ICE-SHEET LAND MARGIN DIATOM EVIDENCE OCEAN PLEISTOCENE NEODYMIUM SEDIMENTS DYNAMICS CLIMATE 02 Physical Sciences 04 Earth Sciences Journal Article 2018 ftimperialcol https://doi.org/10.1016/j.epsl.2018.04.054 2019-05-23T22:40:26Z Significantly reduced ice coverage in Greenland and West Antarctica during the warmer-than-present Pliocene could account for ~10m 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 modelling, and a contribution of ~3 to 4m 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. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Iceberg* West Antarctica Imperial College London: Spiral Antarctic East Antarctic Ice Sheet East Antarctica Greenland 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 |
Imperial College London: Spiral |
op_collection_id |
ftimperialcol |
language |
unknown |
topic |
Science & Technology Physical Sciences Geochemistry & Geophysics East Antarctic Ice Sheet Wilkes Subglacial Basin provenance radiogenic isotopes Pliocene deglacial timescales GLACIAL-INTERGLACIAL CYCLES ICE-SHEET LAND MARGIN DIATOM EVIDENCE OCEAN PLEISTOCENE NEODYMIUM SEDIMENTS DYNAMICS CLIMATE 02 Physical Sciences 04 Earth Sciences |
spellingShingle |
Science & Technology Physical Sciences Geochemistry & Geophysics East Antarctic Ice Sheet Wilkes Subglacial Basin provenance radiogenic isotopes Pliocene deglacial timescales GLACIAL-INTERGLACIAL CYCLES ICE-SHEET LAND MARGIN DIATOM EVIDENCE OCEAN PLEISTOCENE NEODYMIUM SEDIMENTS DYNAMICS CLIMATE 02 Physical Sciences 04 Earth Sciences Bertram, RA Wilson, DJ Van de Flierdt, T McKay, RM Patterson, MO Jimenez-Espejo, FJ Escutia, C Duke, G Taylor-Silva, B Riesselman, C Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
topic_facet |
Science & Technology Physical Sciences Geochemistry & Geophysics East Antarctic Ice Sheet Wilkes Subglacial Basin provenance radiogenic isotopes Pliocene deglacial timescales GLACIAL-INTERGLACIAL CYCLES ICE-SHEET LAND MARGIN DIATOM EVIDENCE OCEAN PLEISTOCENE NEODYMIUM SEDIMENTS DYNAMICS CLIMATE 02 Physical Sciences 04 Earth Sciences |
description |
Significantly reduced ice coverage in Greenland and West Antarctica during the warmer-than-present Pliocene could account for ~10m 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 modelling, and a contribution of ~3 to 4m 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. |
author2 |
Natural Environment Research Council (NERC) Natural Environment Research Council (NERC) |
format |
Article in Journal/Newspaper |
author |
Bertram, RA Wilson, DJ Van de Flierdt, T McKay, RM Patterson, MO Jimenez-Espejo, FJ Escutia, C Duke, G Taylor-Silva, B Riesselman, C |
author_facet |
Bertram, RA Wilson, DJ Van de Flierdt, T McKay, RM Patterson, MO Jimenez-Espejo, FJ Escutia, C Duke, G Taylor-Silva, B Riesselman, C |
author_sort |
Bertram, RA |
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 |
publishDate |
2018 |
url |
http://hdl.handle.net/10044/1/59325 https://doi.org/10.1016/j.epsl.2018.04.054 |
long_lat |
ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Antarctic East Antarctic Ice Sheet East Antarctica Greenland West Antarctica Wilkes Subglacial Basin |
geographic_facet |
Antarctic East Antarctic Ice Sheet East Antarctica Greenland 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_source |
116 109 |
op_relation |
Earth and Planetary Science Letters |
op_rights |
©2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1016/j.epsl.2018.04.054 |
container_title |
Earth and Planetary Science Letters |
container_volume |
494 |
container_start_page |
109 |
op_container_end_page |
116 |
_version_ |
1766273237452324864 |