Numerical simulations of the Cordilleran ice sheet through the last glacial cycle
Despite more than a century of geological observations, the Cordilleran ice sheet of North America remains poorly understood in terms of its former extent, volume and dynamics. Although geomorphological evidence is abundant, its complexity is such that whole ice-sheet reconstructions of advance and...
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_1271221 2023-05-15T13:52:13+02:00 Numerical simulations of the Cordilleran ice sheet through the last glacial cycle Seguinot, J. Rogozhina, I. Stroeven, A. Margold, M. Kleman, J. 2016 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221_3/component/file_1487892/1271221.pdf unknown info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-10-639-2016 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.5194/tcd-9-4147-2015 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221_3/component/file_1487892/1271221.pdf info:eu-repo/semantics/openAccess The Cryosphere info:eu-repo/semantics/article 2016 ftgfzpotsdam https://doi.org/10.5194/tc-10-639-2016 2022-09-14T05:55:53Z Despite more than a century of geological observations, the Cordilleran ice sheet of North America remains poorly understood in terms of its former extent, volume and dynamics. Although geomorphological evidence is abundant, its complexity is such that whole ice-sheet reconstructions of advance and retreat patterns are lacking. Here we use a numerical ice sheet model calibrated against field-based evidence to attempt a quantitative reconstruction of the Cordilleran ice sheet history through the last glacial cycle. A series of simulations is driven by time-dependent temperature offsets from six proxy records located around the globe. Although this approach reveals large variations in model response to evolving climate forcing, all simulations produce two major glaciations during marine oxygen isotope stages 4 (61.9–56.5 ka) and 2 (23.2–16.8 ka). The timing of glaciation is better reproduced using temperature reconstructions from Greenland and Antarctic ice cores than from regional oceanic sediment cores. During most of the last glacial cycle, the modelled ice cover is discontinuous and restricted to high mountain areas. However, widespread precipitation over the Skeena Mountains favours the persistence of a central ice dome throughout the glacial cycle. It acts as a nucleation centre before the Last Glacial Maximum and hosts the last remains of Cordilleran ice until the middle Holocene (6.6–6.2 ka). Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet The Cryosphere GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Antarctic Greenland Skeena ENVELOPE(-130.198,-130.198,53.646,53.646) Skeena Mountains ENVELOPE(-128.671,-128.671,56.500,56.500) The Cryosphere 10 2 639 664 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
unknown |
description |
Despite more than a century of geological observations, the Cordilleran ice sheet of North America remains poorly understood in terms of its former extent, volume and dynamics. Although geomorphological evidence is abundant, its complexity is such that whole ice-sheet reconstructions of advance and retreat patterns are lacking. Here we use a numerical ice sheet model calibrated against field-based evidence to attempt a quantitative reconstruction of the Cordilleran ice sheet history through the last glacial cycle. A series of simulations is driven by time-dependent temperature offsets from six proxy records located around the globe. Although this approach reveals large variations in model response to evolving climate forcing, all simulations produce two major glaciations during marine oxygen isotope stages 4 (61.9–56.5 ka) and 2 (23.2–16.8 ka). The timing of glaciation is better reproduced using temperature reconstructions from Greenland and Antarctic ice cores than from regional oceanic sediment cores. During most of the last glacial cycle, the modelled ice cover is discontinuous and restricted to high mountain areas. However, widespread precipitation over the Skeena Mountains favours the persistence of a central ice dome throughout the glacial cycle. It acts as a nucleation centre before the Last Glacial Maximum and hosts the last remains of Cordilleran ice until the middle Holocene (6.6–6.2 ka). |
format |
Article in Journal/Newspaper |
author |
Seguinot, J. Rogozhina, I. Stroeven, A. Margold, M. Kleman, J. |
spellingShingle |
Seguinot, J. Rogozhina, I. Stroeven, A. Margold, M. Kleman, J. Numerical simulations of the Cordilleran ice sheet through the last glacial cycle |
author_facet |
Seguinot, J. Rogozhina, I. Stroeven, A. Margold, M. Kleman, J. |
author_sort |
Seguinot, J. |
title |
Numerical simulations of the Cordilleran ice sheet through the last glacial cycle |
title_short |
Numerical simulations of the Cordilleran ice sheet through the last glacial cycle |
title_full |
Numerical simulations of the Cordilleran ice sheet through the last glacial cycle |
title_fullStr |
Numerical simulations of the Cordilleran ice sheet through the last glacial cycle |
title_full_unstemmed |
Numerical simulations of the Cordilleran ice sheet through the last glacial cycle |
title_sort |
numerical simulations of the cordilleran ice sheet through the last glacial cycle |
publishDate |
2016 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221_3/component/file_1487892/1271221.pdf |
long_lat |
ENVELOPE(-130.198,-130.198,53.646,53.646) ENVELOPE(-128.671,-128.671,56.500,56.500) |
geographic |
Antarctic Greenland Skeena Skeena Mountains |
geographic_facet |
Antarctic Greenland Skeena Skeena Mountains |
genre |
Antarc* Antarctic Greenland Ice Sheet The Cryosphere |
genre_facet |
Antarc* Antarctic Greenland Ice Sheet The Cryosphere |
op_source |
The Cryosphere |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-10-639-2016 info:eu-repo/semantics/altIdentifier/urn/http://doi.crossref.org/servlet/query?format=unixref&pid=bib@gfz-potsdam.de&id=10.5194/tcd-9-4147-2015 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221 https://gfzpublic.gfz-potsdam.de/pubman/item/item_1271221_3/component/file_1487892/1271221.pdf |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-10-639-2016 |
container_title |
The Cryosphere |
container_volume |
10 |
container_issue |
2 |
container_start_page |
639 |
op_container_end_page |
664 |
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1766256483183362048 |