Numerical simulations of the Cordilleran ice sheet through the last glacial cycle
After more than a century of geological research, the Cordilleran ice sheet of North America remains among the least understood in terms of its former extent, volume, and dynamics. Because of the mountainous topography on which the ice sheet formed, geological studies have often had only local or re...
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ftdoajarticles:oai:doaj.org/article:c7d46b6d46dd4934a35d45098fecb1a3 2023-05-15T13:46:47+02:00 Numerical simulations of the Cordilleran ice sheet through the last glacial cycle J. Seguinot I. Rogozhina A. P. Stroeven M. Margold J. Kleman 2016-03-01T00:00:00Z https://doi.org/10.5194/tc-10-639-2016 https://doaj.org/article/c7d46b6d46dd4934a35d45098fecb1a3 EN eng Copernicus Publications http://www.the-cryosphere.net/10/639/2016/tc-10-639-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-639-2016 https://doaj.org/article/c7d46b6d46dd4934a35d45098fecb1a3 The Cryosphere, Vol 10, Iss 2, Pp 639-664 (2016) Environmental sciences GE1-350 Geology QE1-996.5 article 2016 ftdoajarticles https://doi.org/10.5194/tc-10-639-2016 2022-12-30T21:54:26Z After more than a century of geological research, the Cordilleran ice sheet of North America remains among the least understood in terms of its former extent, volume, and dynamics. Because of the mountainous topography on which the ice sheet formed, geological studies have often had only local or regional relevance and shown such a complexity that ice-sheet-wide spatial 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 (62.2–56.9 ka) and 2 (23.2–16.9 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 (6.7 ka). Article in Journal/Newspaper Antarc* Antarctic Greenland Ice Sheet The Cryosphere Directory of Open Access Journals: DOAJ Articles 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 |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental sciences GE1-350 Geology QE1-996.5 |
spellingShingle |
Environmental sciences GE1-350 Geology QE1-996.5 J. Seguinot I. Rogozhina A. P. Stroeven M. Margold J. Kleman Numerical simulations of the Cordilleran ice sheet through the last glacial cycle |
topic_facet |
Environmental sciences GE1-350 Geology QE1-996.5 |
description |
After more than a century of geological research, the Cordilleran ice sheet of North America remains among the least understood in terms of its former extent, volume, and dynamics. Because of the mountainous topography on which the ice sheet formed, geological studies have often had only local or regional relevance and shown such a complexity that ice-sheet-wide spatial 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 (62.2–56.9 ka) and 2 (23.2–16.9 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 (6.7 ka). |
format |
Article in Journal/Newspaper |
author |
J. Seguinot I. Rogozhina A. P. Stroeven M. Margold J. Kleman |
author_facet |
J. Seguinot I. Rogozhina A. P. Stroeven M. Margold J. Kleman |
author_sort |
J. Seguinot |
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 |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-639-2016 https://doaj.org/article/c7d46b6d46dd4934a35d45098fecb1a3 |
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, Vol 10, Iss 2, Pp 639-664 (2016) |
op_relation |
http://www.the-cryosphere.net/10/639/2016/tc-10-639-2016.pdf https://doaj.org/toc/1994-0416 https://doaj.org/toc/1994-0424 1994-0416 1994-0424 doi:10.5194/tc-10-639-2016 https://doaj.org/article/c7d46b6d46dd4934a35d45098fecb1a3 |
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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1766245209973194752 |