Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology
Understanding the contribution of the West Antarctic Ice Sheet (WAIS) to past and future sea level has been a major scientific priority over the last three decades. In recent years, observed thinning and ice-flow acceleration of the marine-based Pine Island Glacier has highlighted that understanding...
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2021
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:3121503 2023-05-15T13:49:10+02:00 Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology Bodart, JA Bingham, RG Ashmore, DW Karlsson, NB Hein, AS Vaughan, DG 2021 text http://livrepository.liverpool.ac.uk/3121503/ https://doi.org/10.1029/2020jf005927 http://livrepository.liverpool.ac.uk/3121503/1/2021_bodart_jgres.pdf en eng American Geophysical Union (AGU) http://livrepository.liverpool.ac.uk/3121503/1/2021_bodart_jgres.pdf Bodart, JA, Bingham, RG, Ashmore, DW orcid:0000-0003-4829-7854 , Karlsson, NB, Hein, AS and Vaughan, DG (2021) Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology. JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 126 (4). Article NonPeerReviewed 2021 ftunivliverpool https://doi.org/10.1029/2020jf005927 2023-01-20T00:04:01Z Understanding the contribution of the West Antarctic Ice Sheet (WAIS) to past and future sea level has been a major scientific priority over the last three decades. In recent years, observed thinning and ice-flow acceleration of the marine-based Pine Island Glacier has highlighted that understanding dynamic changes is critical to predicting the long-term stability of the WAIS. However, relatively little is known about the evolution of the catchment during the Holocene. Internal reflecting horizons (IRHs) provide a cumulative record of accumulation, basal melt, and ice dynamics that, if dated, can be used to constrain ice-flow models. Here, we use airborne radars to trace four spatially extensive IRHs deposited in the late Quaternary across the Pine Island Glacier catchment. We use the WAIS Divide ice-core chronology to assign ages to three IRHs: 4.72 ± 0.28, 6.94 ± 0.31, and 16.50 ± 0.79 ka. We use a 1-D model, constrained by observational and modeled accumulation rates, to produce an independent validation of our ice-core-derived ages and provide an age estimate for our shallowest IRH (2.31–2.92 ka). We find that our upper three IRHs correspond to three large peaks in sulfate concentrations in the WAIS Divide ice-core record and hypothesize that the origin of these spatially extensive IRHs is from past volcanic activity. The clear correspondence between our IRHs and the ones previously identified over the Weddell Sea Sector, altogether representing ∼20% of the WAIS, indicates that a unique set of stratigraphic markers spanning the Holocene exists over a large part of West Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica ice core Ice Sheet Pine Island Pine Island Glacier Weddell Sea West Antarctica The University of Liverpool Repository Antarctic Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica Journal of Geophysical Research: Earth Surface 126 4 |
institution |
Open Polar |
collection |
The University of Liverpool Repository |
op_collection_id |
ftunivliverpool |
language |
English |
description |
Understanding the contribution of the West Antarctic Ice Sheet (WAIS) to past and future sea level has been a major scientific priority over the last three decades. In recent years, observed thinning and ice-flow acceleration of the marine-based Pine Island Glacier has highlighted that understanding dynamic changes is critical to predicting the long-term stability of the WAIS. However, relatively little is known about the evolution of the catchment during the Holocene. Internal reflecting horizons (IRHs) provide a cumulative record of accumulation, basal melt, and ice dynamics that, if dated, can be used to constrain ice-flow models. Here, we use airborne radars to trace four spatially extensive IRHs deposited in the late Quaternary across the Pine Island Glacier catchment. We use the WAIS Divide ice-core chronology to assign ages to three IRHs: 4.72 ± 0.28, 6.94 ± 0.31, and 16.50 ± 0.79 ka. We use a 1-D model, constrained by observational and modeled accumulation rates, to produce an independent validation of our ice-core-derived ages and provide an age estimate for our shallowest IRH (2.31–2.92 ka). We find that our upper three IRHs correspond to three large peaks in sulfate concentrations in the WAIS Divide ice-core record and hypothesize that the origin of these spatially extensive IRHs is from past volcanic activity. The clear correspondence between our IRHs and the ones previously identified over the Weddell Sea Sector, altogether representing ∼20% of the WAIS, indicates that a unique set of stratigraphic markers spanning the Holocene exists over a large part of West Antarctica. |
format |
Article in Journal/Newspaper |
author |
Bodart, JA Bingham, RG Ashmore, DW Karlsson, NB Hein, AS Vaughan, DG |
spellingShingle |
Bodart, JA Bingham, RG Ashmore, DW Karlsson, NB Hein, AS Vaughan, DG Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology |
author_facet |
Bodart, JA Bingham, RG Ashmore, DW Karlsson, NB Hein, AS Vaughan, DG |
author_sort |
Bodart, JA |
title |
Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology |
title_short |
Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology |
title_full |
Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology |
title_fullStr |
Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology |
title_full_unstemmed |
Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology |
title_sort |
age-depth stratigraphy of pine island glacier inferred from airborne radar and ice-core chronology |
publisher |
American Geophysical Union (AGU) |
publishDate |
2021 |
url |
http://livrepository.liverpool.ac.uk/3121503/ https://doi.org/10.1029/2020jf005927 http://livrepository.liverpool.ac.uk/3121503/1/2021_bodart_jgres.pdf |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Antarctic Pine Island Glacier Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Antarctic Pine Island Glacier Weddell Weddell Sea West Antarctic Ice Sheet West Antarctica |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet Pine Island Pine Island Glacier Weddell Sea West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet Pine Island Pine Island Glacier Weddell Sea West Antarctica |
op_relation |
http://livrepository.liverpool.ac.uk/3121503/1/2021_bodart_jgres.pdf Bodart, JA, Bingham, RG, Ashmore, DW orcid:0000-0003-4829-7854 , Karlsson, NB, Hein, AS and Vaughan, DG (2021) Age-Depth Stratigraphy of Pine Island Glacier Inferred From Airborne Radar and Ice-Core Chronology. JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE, 126 (4). |
op_doi |
https://doi.org/10.1029/2020jf005927 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
4 |
_version_ |
1766250957974274048 |