Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum
The uncertain response of marine terminating outlet glaciers to climate change at time scales beyond short-term observation limits models of future sea level rise. At temperate tidewater margins, abundant subglacial meltwater forms morainal banks (marine shoals) or ice-contact deltas that reduce wat...
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ftpubmed:oai:pubmedcentral.nih.gov:7156478 2023-05-15T16:40:52+02:00 Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum Cowan, Ellen A. Zellers, Sarah D. Müller, Juliane Walczak, Maureen H. Worthington, Lindsay L. Caissie, Beth E. Clary, Wesley A. Jaeger, John M. Gulick, Sean P. S. Pratt, Jacob W. Mix, Alan C. Fallon, Stewart J. 2020-04-14 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7156478/ http://www.ncbi.nlm.nih.gov/pubmed/32286283 https://doi.org/10.1038/s41467-020-15579-0 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7156478/ http://www.ncbi.nlm.nih.gov/pubmed/32286283 http://dx.doi.org/10.1038/s41467-020-15579-0 © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2020 ftpubmed https://doi.org/10.1038/s41467-020-15579-0 2020-04-26T00:25:00Z The uncertain response of marine terminating outlet glaciers to climate change at time scales beyond short-term observation limits models of future sea level rise. At temperate tidewater margins, abundant subglacial meltwater forms morainal banks (marine shoals) or ice-contact deltas that reduce water depth, stabilizing grounding lines and slowing or reversing glacial retreat. Here we present a radiocarbon-dated record from Integrated Ocean Drilling Program (IODP) Site U1421 that tracks the terminus of the largest Alaskan Cordilleran Ice Sheet outlet glacier during Last Glacial Maximum climate transitions. Sedimentation rates, ice-rafted debris, and microfossil and biogeochemical proxies, show repeated abrupt collapses and slow advances typical of the tidewater glacier cycle observed in modern systems. When global sea level rise exceeded the local rate of bank building, the cycle of readvances stopped leading to irreversible retreat. These results support theory that suggests sediment dynamics can control tidewater terminus position on an open shelf under temperate conditions delaying climate-driven retreat. Text Ice Sheet Tidewater PubMed Central (PMC) Nature Communications 11 1 |
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Article Cowan, Ellen A. Zellers, Sarah D. Müller, Juliane Walczak, Maureen H. Worthington, Lindsay L. Caissie, Beth E. Clary, Wesley A. Jaeger, John M. Gulick, Sean P. S. Pratt, Jacob W. Mix, Alan C. Fallon, Stewart J. Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum |
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Article |
description |
The uncertain response of marine terminating outlet glaciers to climate change at time scales beyond short-term observation limits models of future sea level rise. At temperate tidewater margins, abundant subglacial meltwater forms morainal banks (marine shoals) or ice-contact deltas that reduce water depth, stabilizing grounding lines and slowing or reversing glacial retreat. Here we present a radiocarbon-dated record from Integrated Ocean Drilling Program (IODP) Site U1421 that tracks the terminus of the largest Alaskan Cordilleran Ice Sheet outlet glacier during Last Glacial Maximum climate transitions. Sedimentation rates, ice-rafted debris, and microfossil and biogeochemical proxies, show repeated abrupt collapses and slow advances typical of the tidewater glacier cycle observed in modern systems. When global sea level rise exceeded the local rate of bank building, the cycle of readvances stopped leading to irreversible retreat. These results support theory that suggests sediment dynamics can control tidewater terminus position on an open shelf under temperate conditions delaying climate-driven retreat. |
format |
Text |
author |
Cowan, Ellen A. Zellers, Sarah D. Müller, Juliane Walczak, Maureen H. Worthington, Lindsay L. Caissie, Beth E. Clary, Wesley A. Jaeger, John M. Gulick, Sean P. S. Pratt, Jacob W. Mix, Alan C. Fallon, Stewart J. |
author_facet |
Cowan, Ellen A. Zellers, Sarah D. Müller, Juliane Walczak, Maureen H. Worthington, Lindsay L. Caissie, Beth E. Clary, Wesley A. Jaeger, John M. Gulick, Sean P. S. Pratt, Jacob W. Mix, Alan C. Fallon, Stewart J. |
author_sort |
Cowan, Ellen A. |
title |
Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum |
title_short |
Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum |
title_full |
Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum |
title_fullStr |
Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum |
title_full_unstemmed |
Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum |
title_sort |
sediment controls dynamic behavior of a cordilleran ice stream at the last glacial maximum |
publisher |
Nature Publishing Group UK |
publishDate |
2020 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7156478/ http://www.ncbi.nlm.nih.gov/pubmed/32286283 https://doi.org/10.1038/s41467-020-15579-0 |
genre |
Ice Sheet Tidewater |
genre_facet |
Ice Sheet Tidewater |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7156478/ http://www.ncbi.nlm.nih.gov/pubmed/32286283 http://dx.doi.org/10.1038/s41467-020-15579-0 |
op_rights |
© The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1038/s41467-020-15579-0 |
container_title |
Nature Communications |
container_volume |
11 |
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1 |
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1766031292272476160 |