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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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/219259 2024-01-14T10:07:44+01:00 Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum Cowan, Ellen A Zellers, Sarah D Muller, Juliane Walczak, M 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 application/pdf http://hdl.handle.net/1885/219259 https://doi.org/10.1038/s41467-020-15579-0 https://openresearch-repository.anu.edu.au/bitstream/1885/219259/3/01_Cowan_Sediment_controls_dynamic_2020.pdf.jpg en_AU eng Macmillan Publishers Ltd 2041-1723 http://hdl.handle.net/1885/219259 doi:10.1038/s41467-020-15579-0 https://openresearch-repository.anu.edu.au/bitstream/1885/219259/3/01_Cowan_Sediment_controls_dynamic_2020.pdf.jpg © The Author(s) 2020 http://creativecommons.org/ licenses/by/4.0/ Creative Commons Attribution 4.0 International License Nature Communications Journal article ftanucanberra https://doi.org/10.1038/s41467-020-15579-0 2023-12-15T09:36:55Z 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 Funding was provided by the National Science Foundation award OCE1434945 and a post-expedition award from the U.S. Science Support Program of IODP to E.A.C. J.M. received funding from the German Research Foundation (MU3670/1-2) and a Helmholtz Research grant (VH-NG-1101). S.D.Z. received funding from the University of Central Missouri Center for Teaching and Learning. M.H.W. and S.J.F. acknowledge support from the Australian IODP office, Australian Research Council, and American Australian Association. This is the University of Texas Institute for Geophysics Contribution #3644. Article in Journal/Newspaper Ice Sheet Tidewater Australian National University: ANU Digital Collections Nature Communications 11 1 |
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Open Polar |
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Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
English |
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 Funding was provided by the National Science Foundation award OCE1434945 and a post-expedition award from the U.S. Science Support Program of IODP to E.A.C. J.M. received funding from the German Research Foundation (MU3670/1-2) and a Helmholtz Research grant (VH-NG-1101). S.D.Z. received funding from the University of Central Missouri Center for Teaching and Learning. M.H.W. and S.J.F. acknowledge support from the Australian IODP office, Australian Research Council, and American Australian Association. This is the University of Texas Institute for Geophysics Contribution #3644. |
format |
Article in Journal/Newspaper |
author |
Cowan, Ellen A Zellers, Sarah D Muller, Juliane Walczak, M 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 |
spellingShingle |
Cowan, Ellen A Zellers, Sarah D Muller, Juliane Walczak, M 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 Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum |
author_facet |
Cowan, Ellen A Zellers, Sarah D Muller, Juliane Walczak, M 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 |
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 |
Macmillan Publishers Ltd |
url |
http://hdl.handle.net/1885/219259 https://doi.org/10.1038/s41467-020-15579-0 https://openresearch-repository.anu.edu.au/bitstream/1885/219259/3/01_Cowan_Sediment_controls_dynamic_2020.pdf.jpg |
genre |
Ice Sheet Tidewater |
genre_facet |
Ice Sheet Tidewater |
op_source |
Nature Communications |
op_relation |
2041-1723 http://hdl.handle.net/1885/219259 doi:10.1038/s41467-020-15579-0 https://openresearch-repository.anu.edu.au/bitstream/1885/219259/3/01_Cowan_Sediment_controls_dynamic_2020.pdf.jpg |
op_rights |
© The Author(s) 2020 http://creativecommons.org/ licenses/by/4.0/ Creative Commons Attribution 4.0 International License |
op_doi |
https://doi.org/10.1038/s41467-020-15579-0 |
container_title |
Nature Communications |
container_volume |
11 |
container_issue |
1 |
_version_ |
1788062132650115072 |