Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records
Multichannel seismic reflection profiles provide a record of the glacial development in the western Amundsen Sea Embayment during the Neogene. We identified a northwest-dipping reflector series of more than 1 s TWT thickness (>800 m) on the middle continental shelf indicating well-layered sedimen...
Published in: | Global and Planetary Change |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Elsevier
2009
|
Subjects: | |
Online Access: | http://nora.nerc.ac.uk/id/eprint/11368/ |
id |
ftnerc:oai:nora.nerc.ac.uk:11368 |
---|---|
record_format |
openpolar |
spelling |
ftnerc:oai:nora.nerc.ac.uk:11368 2024-02-11T09:55:17+01:00 Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. 2009 http://nora.nerc.ac.uk/id/eprint/11368/ unknown Elsevier Weigelt, Estella; Gohl, Karsten; Uenzelmann-Neben, Gabriele; Larter, Robert D. orcid:0000-0002-8414-7389 . 2009 Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records. Global and Planetary Change, 69 (3). 162-169. https://doi.org/10.1016/j.gloplacha.2009.07.004 <https://doi.org/10.1016/j.gloplacha.2009.07.004> Meteorology and Climatology Glaciology Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.1016/j.gloplacha.2009.07.004 2024-01-26T00:03:20Z Multichannel seismic reflection profiles provide a record of the glacial development in the western Amundsen Sea Embayment during the Neogene. We identified a northwest-dipping reflector series of more than 1 s TWT thickness (>800 m) on the middle continental shelf indicating well-layered sedimentary units. The dipping strata reveal a striking alternation of reflection-poor, almost transparent units and sequences of closely spaced, continuous reflectors. We suggest that the distinct changes in reflection character represent episodes of ice sheet advance and retreat forced by climate changes. Boundaries between acoustic units are sharp, but without chronological data we cannot constrain the rapidity of glacial advances and retreats. Due to the similarity between the seismic stratigraphy and the lithology in bore-hole records from the Amundsen Sea and Ross Sea, we infer that dipping strata have accumulated since an intensification of glaciation in the Miocene. On the inner and middle shelf we can identify at least four episodes of ice sheet expansion. We conclude that the West Antarctic Ice Sheet has responded sensitively to climate variations since the Miocene. Article in Journal/Newspaper Amundsen Sea Antarc* Antarctic Ice Sheet Ross Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Ross Sea Amundsen Sea West Antarctic Ice Sheet Global and Planetary Change 69 3 162 169 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
topic |
Meteorology and Climatology Glaciology |
spellingShingle |
Meteorology and Climatology Glaciology Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records |
topic_facet |
Meteorology and Climatology Glaciology |
description |
Multichannel seismic reflection profiles provide a record of the glacial development in the western Amundsen Sea Embayment during the Neogene. We identified a northwest-dipping reflector series of more than 1 s TWT thickness (>800 m) on the middle continental shelf indicating well-layered sedimentary units. The dipping strata reveal a striking alternation of reflection-poor, almost transparent units and sequences of closely spaced, continuous reflectors. We suggest that the distinct changes in reflection character represent episodes of ice sheet advance and retreat forced by climate changes. Boundaries between acoustic units are sharp, but without chronological data we cannot constrain the rapidity of glacial advances and retreats. Due to the similarity between the seismic stratigraphy and the lithology in bore-hole records from the Amundsen Sea and Ross Sea, we infer that dipping strata have accumulated since an intensification of glaciation in the Miocene. On the inner and middle shelf we can identify at least four episodes of ice sheet expansion. We conclude that the West Antarctic Ice Sheet has responded sensitively to climate variations since the Miocene. |
format |
Article in Journal/Newspaper |
author |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. |
author_facet |
Weigelt, Estella Gohl, Karsten Uenzelmann-Neben, Gabriele Larter, Robert D. |
author_sort |
Weigelt, Estella |
title |
Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records |
title_short |
Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records |
title_full |
Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records |
title_fullStr |
Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records |
title_full_unstemmed |
Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records |
title_sort |
late cenozoic ice sheet cyclicity in the western amundsen sea embayment - evidence from seismic records |
publisher |
Elsevier |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/11368/ |
geographic |
Antarctic Ross Sea Amundsen Sea West Antarctic Ice Sheet |
geographic_facet |
Antarctic Ross Sea Amundsen Sea West Antarctic Ice Sheet |
genre |
Amundsen Sea Antarc* Antarctic Ice Sheet Ross Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Ice Sheet Ross Sea |
op_relation |
Weigelt, Estella; Gohl, Karsten; Uenzelmann-Neben, Gabriele; Larter, Robert D. orcid:0000-0002-8414-7389 . 2009 Late Cenozoic ice sheet cyclicity in the western Amundsen Sea Embayment - evidence from seismic records. Global and Planetary Change, 69 (3). 162-169. https://doi.org/10.1016/j.gloplacha.2009.07.004 <https://doi.org/10.1016/j.gloplacha.2009.07.004> |
op_doi |
https://doi.org/10.1016/j.gloplacha.2009.07.004 |
container_title |
Global and Planetary Change |
container_volume |
69 |
container_issue |
3 |
container_start_page |
162 |
op_container_end_page |
169 |
_version_ |
1790594840377950208 |