An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments
Abstract Understanding of glacially driven sedimentary transport systems across the shelf to the slope and subsequently to deep sea sediment bodies along the Pacific continental margin of Antarctic Peninsula is crucial for interpreting ice sheet dynamics. Here we quantify slope-failure frequencies r...
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2009
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Online Access: | http://dx.doi.org/10.1017/s0954102009990289 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009990289 |
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crcambridgeupr:10.1017/s0954102009990289 2024-03-03T08:38:02+00:00 An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments Hepp, Daniel A. Mörz, Tobias 2009 http://dx.doi.org/10.1017/s0954102009990289 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009990289 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 21, issue 6, page 619-631 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2009 crcambridgeupr https://doi.org/10.1017/s0954102009990289 2024-02-08T08:44:49Z Abstract Understanding of glacially driven sedimentary transport systems across the shelf to the slope and subsequently to deep sea sediment bodies along the Pacific continental margin of Antarctic Peninsula is crucial for interpreting ice sheet dynamics. Here we quantify slope-failure frequencies recorded in Pliocene core intervals of ODP Site 1095. We used the relationship between long-term sedimentation rate and marine carbon burial efficiency to calculate glacial or interglacial specific sedimentation rates. Using the decompacted average length of glacial-interglacial cycles it was possible to solve a set of linear equations to derive average half-periods of 61.59 and 59.77 kyr respectively for the time interval 5.8–3.2 Ma. The resulting frequency distribution of slope failures reflects short and rapid but cyclic ice advances every ∼375 years. Short retention times between slope loading and slope failure are supported by biogenic silica dissolution analyses. This study demonstrates the potential of the rise record to improve models of orbitally controlled size variations of the West Antarctic ice sheet and confirms the hypothesis of a highly dynamic ice sheet during the early Pliocene warm period. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Ice Sheet Cambridge University Press Antarctic Antarctic Peninsula West Antarctic Ice Sheet Pacific Antarctic Science 21 6 619 631 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Hepp, Daniel A. Mörz, Tobias An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Abstract Understanding of glacially driven sedimentary transport systems across the shelf to the slope and subsequently to deep sea sediment bodies along the Pacific continental margin of Antarctic Peninsula is crucial for interpreting ice sheet dynamics. Here we quantify slope-failure frequencies recorded in Pliocene core intervals of ODP Site 1095. We used the relationship between long-term sedimentation rate and marine carbon burial efficiency to calculate glacial or interglacial specific sedimentation rates. Using the decompacted average length of glacial-interglacial cycles it was possible to solve a set of linear equations to derive average half-periods of 61.59 and 59.77 kyr respectively for the time interval 5.8–3.2 Ma. The resulting frequency distribution of slope failures reflects short and rapid but cyclic ice advances every ∼375 years. Short retention times between slope loading and slope failure are supported by biogenic silica dissolution analyses. This study demonstrates the potential of the rise record to improve models of orbitally controlled size variations of the West Antarctic ice sheet and confirms the hypothesis of a highly dynamic ice sheet during the early Pliocene warm period. |
format |
Article in Journal/Newspaper |
author |
Hepp, Daniel A. Mörz, Tobias |
author_facet |
Hepp, Daniel A. Mörz, Tobias |
author_sort |
Hepp, Daniel A. |
title |
An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments |
title_short |
An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments |
title_full |
An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments |
title_fullStr |
An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments |
title_full_unstemmed |
An approach to quantifying Pliocene ice sheet dynamics via slope failure frequencies recorded in Antarctic Peninsula rise sediments |
title_sort |
approach to quantifying pliocene ice sheet dynamics via slope failure frequencies recorded in antarctic peninsula rise sediments |
publisher |
Cambridge University Press (CUP) |
publishDate |
2009 |
url |
http://dx.doi.org/10.1017/s0954102009990289 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009990289 |
geographic |
Antarctic Antarctic Peninsula West Antarctic Ice Sheet Pacific |
geographic_facet |
Antarctic Antarctic Peninsula West Antarctic Ice Sheet Pacific |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Ice Sheet |
op_source |
Antarctic Science volume 21, issue 6, page 619-631 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102009990289 |
container_title |
Antarctic Science |
container_volume |
21 |
container_issue |
6 |
container_start_page |
619 |
op_container_end_page |
631 |
_version_ |
1792503911143178240 |