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...
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ftunivgranada:oai:digibug.ugr.es:10481/54803 2023-05-15T13:43:27+02:00 Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica van de Flierdt, Tina M.McKay, Robert Jiménez-Espejo, Francisco José Escutia Dotti, Carlota Bertrama, Rachel.A Wilsona, David J. Patterson, Molly O. Duke, Grace C. Taylor-Silva, Briar I. Riesselman, Christina R. 2018 http://hdl.handle.net/10481/54803 eng eng Elsevier B.V. Bertrama, Rachel.A; Wilsona, David J.; van de Flierdt, Tina; M.McKay, Robert; Patterson, Molly.O; Jimenez-Espejo, Francisco J.; Escutia, Carlota; Duke, Grace C.; Taylor-Silva, Briar I.; Riesselman, Christina R. Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica. Earth and Planetary Science Letters 494 (2018) 109–116. [http://hdl.handle.net/10481/54803] 0012-821X http://hdl.handle.net/10481/54803 Atribución 3.0 España http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess CC-BY East Antarctic Ice Sheet Wilkes Subglacial Basin Provenance Radiogenic isotopes Pliocene Deglacial timescales info:eu-repo/semantics/article 2018 ftunivgranada 2021-02-17T00:20:07Z 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 modeling, 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. Provenance analysis was supported by a Kristian Gerhard Jeb-sen PhD Scholarship and NERC UK IODP grants (NE/H025162/1 and NE/H014144/1). Biogenic silica data was supported by a Royal So-ciety of New Zealand Marsden FastStart grant (#UOO-1315) and a University of Otago PhD Scholarship. Support for sedimentol-ogyanalysis was provided by the Royal Society of New ZealandRutherford Discovery Fellowship (RDF-13-VUW-003). XRF work was supported by the Ministry of Science and Innovation Grant CTM2014-60451-C2-1-P co-financed by the European Regional De-velopment Fund (FEDER). Samples were provided by the Integrated Ocean Drilling Program. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Greenland Ice Sheet Iceberg* West Antarctica DIGIBUG: Repositorio Institucional de la Universidad de Granada Antarctic East Antarctica West Antarctica East Antarctic Ice Sheet Greenland New Zealand Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) Wilkes Subglacial Basin ENVELOPE(145.000,145.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
DIGIBUG: Repositorio Institucional de la Universidad de Granada |
op_collection_id |
ftunivgranada |
language |
English |
topic |
East Antarctic Ice Sheet Wilkes Subglacial Basin Provenance Radiogenic isotopes Pliocene Deglacial timescales |
spellingShingle |
East Antarctic Ice Sheet Wilkes Subglacial Basin Provenance Radiogenic isotopes Pliocene Deglacial timescales van de Flierdt, Tina M.McKay, Robert Jiménez-Espejo, Francisco José Escutia Dotti, Carlota Bertrama, Rachel.A Wilsona, David J. Patterson, Molly O. Duke, Grace C. Taylor-Silva, Briar I. Riesselman, Christina R. Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica |
topic_facet |
East Antarctic Ice Sheet Wilkes Subglacial Basin 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 ∼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 modeling, 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. Provenance analysis was supported by a Kristian Gerhard Jeb-sen PhD Scholarship and NERC UK IODP grants (NE/H025162/1 and NE/H014144/1). Biogenic silica data was supported by a Royal So-ciety of New Zealand Marsden FastStart grant (#UOO-1315) and a University of Otago PhD Scholarship. Support for sedimentol-ogyanalysis was provided by the Royal Society of New ZealandRutherford Discovery Fellowship (RDF-13-VUW-003). XRF work was supported by the Ministry of Science and Innovation Grant CTM2014-60451-C2-1-P co-financed by the European Regional De-velopment Fund (FEDER). Samples were provided by the Integrated Ocean Drilling Program. |
format |
Article in Journal/Newspaper |
author |
van de Flierdt, Tina M.McKay, Robert Jiménez-Espejo, Francisco José Escutia Dotti, Carlota Bertrama, Rachel.A Wilsona, David J. Patterson, Molly O. Duke, Grace C. Taylor-Silva, Briar I. Riesselman, Christina R. |
author_facet |
van de Flierdt, Tina M.McKay, Robert Jiménez-Espejo, Francisco José Escutia Dotti, Carlota Bertrama, Rachel.A Wilsona, David J. Patterson, Molly O. Duke, Grace C. Taylor-Silva, Briar I. Riesselman, Christina R. |
author_sort |
van de Flierdt, Tina |
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 B.V. |
publishDate |
2018 |
url |
http://hdl.handle.net/10481/54803 |
long_lat |
ENVELOPE(66.067,66.067,-67.867,-67.867) ENVELOPE(145.000,145.000,-75.000,-75.000) |
geographic |
Antarctic East Antarctica West Antarctica East Antarctic Ice Sheet Greenland New Zealand Marsden Wilkes Subglacial Basin |
geographic_facet |
Antarctic East Antarctica West Antarctica East Antarctic Ice Sheet Greenland New Zealand Marsden 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 |
Bertrama, Rachel.A; Wilsona, David J.; van de Flierdt, Tina; M.McKay, Robert; Patterson, Molly.O; Jimenez-Espejo, Francisco J.; Escutia, Carlota; Duke, Grace C.; Taylor-Silva, Briar I.; Riesselman, Christina R. Pliocene deglacial event timelines and the biogeochemical response offshore Wilkes Subglacial Basin, East Antarctica. Earth and Planetary Science Letters 494 (2018) 109–116. [http://hdl.handle.net/10481/54803] 0012-821X http://hdl.handle.net/10481/54803 |
op_rights |
Atribución 3.0 España http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
_version_ |
1766189109436481536 |