Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum
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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
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...[Show more]
dc.contributor.author | Cowan, Ellen A | |
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dc.contributor.author | Zellers, Sarah D | |
dc.contributor.author | Muller, Juliane | |
dc.contributor.author | Walczak, M H | |
dc.contributor.author | Worthington, Lindsay L | |
dc.contributor.author | Caissie, Beth E | |
dc.contributor.author | Clary, Wesley A | |
dc.contributor.author | Jaeger, John M | |
dc.contributor.author | Gulick, Sean P S | |
dc.contributor.author | Pratt, Jacob W | |
dc.contributor.author | Mix, Alan C | |
dc.contributor.author | Fallon, Stewart | |
dc.date.accessioned | 2021-01-10T23:44:12Z | |
dc.date.available | 2021-01-10T23:44:12Z | |
dc.identifier.issn | 2041-1723 | |
dc.identifier.uri | http://hdl.handle.net/1885/219259 | |
dc.description.abstract | 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 | |
dc.description.sponsorship | 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. | |
dc.format.mimetype | application/pdf | |
dc.language.iso | en_AU | |
dc.publisher | Macmillan Publishers Ltd | |
dc.rights | © The Author(s) 2020 | |
dc.rights.uri | http://creativecommons.org/ licenses/by/4.0/ | |
dc.source | Nature Communications | |
dc.title | Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 11 | |
dc.date.issued | 2020 | |
local.identifier.absfor | 040600 - PHYSICAL GEOGRAPHY AND ENVIRONMENTAL GEOSCIENCE | |
local.identifier.ariespublication | a383154xPUB11035 | |
local.publisher.url | http://www.nature.com/ncomms/index.html | |
local.type.status | Published Version | |
local.contributor.affiliation | Cowan, Ellen A, Appalachian State University | |
local.contributor.affiliation | Zellers, Sarah D, University of Central Missouri | |
local.contributor.affiliation | Muller, Juliane, Alfred Wegener Institute | |
local.contributor.affiliation | Walczak, M H, Oregon State University | |
local.contributor.affiliation | Worthington, Lindsay L, University of New Mexico | |
local.contributor.affiliation | Caissie, Beth E, Iowa State University | |
local.contributor.affiliation | Clary, Wesley A, University of New Mexico | |
local.contributor.affiliation | Jaeger, John M, University of Florida | |
local.contributor.affiliation | Gulick, Sean P S, University of Texas at Austin | |
local.contributor.affiliation | Pratt, Jacob W, Appalachian State University | |
local.contributor.affiliation | Mix, Alan C, Oregon State University | |
local.contributor.affiliation | Fallon, Stewart, College of Science, ANU | |
local.bibliographicCitation.issue | 1 | |
local.bibliographicCitation.startpage | 1 | |
local.bibliographicCitation.lastpage | 9 | |
local.identifier.doi | 10.1038/s41467-020-15579-0 | |
local.identifier.absseo | 970104 - Expanding Knowledge in the Earth Sciences | |
dc.date.updated | 2020-11-02T04:16:49Z | |
dcterms.accessRights | Open Access | |
dc.provenance | 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/. | |
dc.rights.license | Creative Commons Attribution 4.0 International License | |
Collections | ANU Research Publications |
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