Documentation of sediment cores
The presence of a complex bedform arrangement on the sea-floor of the continental shelf in the western Amundsen Sea Embayment, West Antarctica, indicates a multi-temporal record of flow related to the activity of one or more ice streams in the past. Mapping and division of the bedforms into distinct...
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2009
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.724192 2023-05-15T13:24:02+02:00 Documentation of sediment cores Graham, Alastair G C Larter, Robert D Gohl, Karsten Hillenbrand, Claus-Dieter Smith, James A Kuhn, Gerhard MEDIAN LATITUDE: -73.461520 * MEDIAN LONGITUDE: -115.001480 * SOUTH-BOUND LATITUDE: -74.301700 * WEST-BOUND LONGITUDE: -118.486200 * NORTH-BOUND LATITUDE: -72.764300 * EAST-BOUND LONGITUDE: -110.265400 * DATE/TIME START: 2006-03-01T18:01:00 * DATE/TIME END: 2006-03-10T22:51:00 2009-07-07 application/zip, 15 datasets https://doi.pangaea.de/10.1594/PANGAEA.724192 https://doi.org/10.1594/PANGAEA.724192 en eng PANGAEA Graham, Alastair G C; Larter, Robert D; Gohl, Karsten; Hillenbrand, Claus-Dieter; Smith, James A; Kuhn, Gerhard (2009): Bedform signature of a West Antarctic palaeo-ice stream reveals a multi-temporal record of flow and substrate control. Quaternary Science Reviews, 28(25-26), 2774-279, https://doi.org/10.1016/j.quascirev.2009.07.003 https://doi.pangaea.de/10.1594/PANGAEA.724192 https://doi.org/10.1594/PANGAEA.724192 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Amundsen Sea ANT-XXIII/4 AWI_Paleo GC Giant box corer GKG Gravity corer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS69 PS69/259-1 PS69/265-3 PS69/266-1 PS69/267-1 PS69/267-2 PS69/269-1 PS69/269-2 PS69/272-2 PS69/272-3 PS69/275-2 PS69/280-1 PS69/283-5 PS69/283-6 PS69/284-1 PS69/284-2 Dataset 2009 ftpangaea https://doi.org/10.1594/PANGAEA.724192 https://doi.org/10.1016/j.quascirev.2009.07.003 2023-01-20T07:31:27Z The presence of a complex bedform arrangement on the sea-floor of the continental shelf in the western Amundsen Sea Embayment, West Antarctica, indicates a multi-temporal record of flow related to the activity of one or more ice streams in the past. Mapping and division of the bedforms into distinct landform assemblages reveals their time-transgressive history, which implies that bedforms can neither be considered part of a single down-flow continuum nor a direct proxy for palaeo-ice velocity, as suggested previously. A main control on the bedform imprint is the geology of the shelf, which is divided broadly between rough bedrock on the inner shelf, and smooth, dipping sedimentary strata on the mid-to-outer shelf. Inner shelf bedform variability is well preserved, revealing information about local, complex basal-ice conditions, meltwater flow, and ice dynamics over time. These details, which are not apparent at the scale of regional morphological studies, indicate that past ice streams flowed across the entire shelf, at times, and often had onset zones that lay within the interior of the Antarctic Ice Sheet today. In contrast, highly elongated subglacial bedforms on sedimentary strata of the middle to outer shelf represent a timeslice snapshot of the last activity of ice-stream flow, and may be a truer representation of fast palaeo-ice flow in these locations. A revised model for ice streams on the shelf captures complicated multi-temporal bedform patterns associated with an Antarctic palaeo-ice stream for the first time, and confirms a strong substrate control on this ice stream system that drained the West Antarctic Ice Sheet during the Late Quaternary. Dataset Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica PANGAEA - Data Publisher for Earth & Environmental Science Amundsen Sea Antarctic The Antarctic West Antarctic Ice Sheet West Antarctica ENVELOPE(-118.486200,-110.265400,-72.764300,-74.301700) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Amundsen Sea ANT-XXIII/4 AWI_Paleo GC Giant box corer GKG Gravity corer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS69 PS69/259-1 PS69/265-3 PS69/266-1 PS69/267-1 PS69/267-2 PS69/269-1 PS69/269-2 PS69/272-2 PS69/272-3 PS69/275-2 PS69/280-1 PS69/283-5 PS69/283-6 PS69/284-1 PS69/284-2 |
spellingShingle |
Amundsen Sea ANT-XXIII/4 AWI_Paleo GC Giant box corer GKG Gravity corer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS69 PS69/259-1 PS69/265-3 PS69/266-1 PS69/267-1 PS69/267-2 PS69/269-1 PS69/269-2 PS69/272-2 PS69/272-3 PS69/275-2 PS69/280-1 PS69/283-5 PS69/283-6 PS69/284-1 PS69/284-2 Graham, Alastair G C Larter, Robert D Gohl, Karsten Hillenbrand, Claus-Dieter Smith, James A Kuhn, Gerhard Documentation of sediment cores |
topic_facet |
Amundsen Sea ANT-XXIII/4 AWI_Paleo GC Giant box corer GKG Gravity corer Paleoenvironmental Reconstructions from Marine Sediments @ AWI Polarstern PS69 PS69/259-1 PS69/265-3 PS69/266-1 PS69/267-1 PS69/267-2 PS69/269-1 PS69/269-2 PS69/272-2 PS69/272-3 PS69/275-2 PS69/280-1 PS69/283-5 PS69/283-6 PS69/284-1 PS69/284-2 |
description |
The presence of a complex bedform arrangement on the sea-floor of the continental shelf in the western Amundsen Sea Embayment, West Antarctica, indicates a multi-temporal record of flow related to the activity of one or more ice streams in the past. Mapping and division of the bedforms into distinct landform assemblages reveals their time-transgressive history, which implies that bedforms can neither be considered part of a single down-flow continuum nor a direct proxy for palaeo-ice velocity, as suggested previously. A main control on the bedform imprint is the geology of the shelf, which is divided broadly between rough bedrock on the inner shelf, and smooth, dipping sedimentary strata on the mid-to-outer shelf. Inner shelf bedform variability is well preserved, revealing information about local, complex basal-ice conditions, meltwater flow, and ice dynamics over time. These details, which are not apparent at the scale of regional morphological studies, indicate that past ice streams flowed across the entire shelf, at times, and often had onset zones that lay within the interior of the Antarctic Ice Sheet today. In contrast, highly elongated subglacial bedforms on sedimentary strata of the middle to outer shelf represent a timeslice snapshot of the last activity of ice-stream flow, and may be a truer representation of fast palaeo-ice flow in these locations. A revised model for ice streams on the shelf captures complicated multi-temporal bedform patterns associated with an Antarctic palaeo-ice stream for the first time, and confirms a strong substrate control on this ice stream system that drained the West Antarctic Ice Sheet during the Late Quaternary. |
format |
Dataset |
author |
Graham, Alastair G C Larter, Robert D Gohl, Karsten Hillenbrand, Claus-Dieter Smith, James A Kuhn, Gerhard |
author_facet |
Graham, Alastair G C Larter, Robert D Gohl, Karsten Hillenbrand, Claus-Dieter Smith, James A Kuhn, Gerhard |
author_sort |
Graham, Alastair G C |
title |
Documentation of sediment cores |
title_short |
Documentation of sediment cores |
title_full |
Documentation of sediment cores |
title_fullStr |
Documentation of sediment cores |
title_full_unstemmed |
Documentation of sediment cores |
title_sort |
documentation of sediment cores |
publisher |
PANGAEA |
publishDate |
2009 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.724192 https://doi.org/10.1594/PANGAEA.724192 |
op_coverage |
MEDIAN LATITUDE: -73.461520 * MEDIAN LONGITUDE: -115.001480 * SOUTH-BOUND LATITUDE: -74.301700 * WEST-BOUND LONGITUDE: -118.486200 * NORTH-BOUND LATITUDE: -72.764300 * EAST-BOUND LONGITUDE: -110.265400 * DATE/TIME START: 2006-03-01T18:01:00 * DATE/TIME END: 2006-03-10T22:51:00 |
long_lat |
ENVELOPE(-118.486200,-110.265400,-72.764300,-74.301700) |
geographic |
Amundsen Sea Antarctic The Antarctic West Antarctic Ice Sheet West Antarctica |
geographic_facet |
Amundsen Sea Antarctic The Antarctic West Antarctic Ice Sheet West Antarctica |
genre |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctica Ice Sheet West Antarctica |
op_relation |
Graham, Alastair G C; Larter, Robert D; Gohl, Karsten; Hillenbrand, Claus-Dieter; Smith, James A; Kuhn, Gerhard (2009): Bedform signature of a West Antarctic palaeo-ice stream reveals a multi-temporal record of flow and substrate control. Quaternary Science Reviews, 28(25-26), 2774-279, https://doi.org/10.1016/j.quascirev.2009.07.003 https://doi.pangaea.de/10.1594/PANGAEA.724192 https://doi.org/10.1594/PANGAEA.724192 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.724192 https://doi.org/10.1016/j.quascirev.2009.07.003 |
_version_ |
1766377108214382592 |