Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains
The geologic record of mountain glaciations is a robust indicator of terrestrial paleoclimate change. During the last glaciation, mountain ranges across the western US hosted glaciers while the Cordilleran and Laurentide ice sheets flowed to the west and east of the continental divide, respectively....
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Copernicus Publications
2022
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fttriple:oai:gotriple.eu:oai:doaj.org/article:d196f69d9026449e97726ce1a315b59e 2023-05-15T16:40:32+02:00 Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains B. J. Quirk E. Huss B. J. C. Laabs E. Leonard J. Licciardi M. A. Plummer M. W. Caffee 2022-02-01 https://doi.org/10.5194/cp-18-293-2022 https://cp.copernicus.org/articles/18/293/2022/cp-18-293-2022.pdf https://doaj.org/article/d196f69d9026449e97726ce1a315b59e en eng Copernicus Publications doi:10.5194/cp-18-293-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/293/2022/cp-18-293-2022.pdf https://doaj.org/article/d196f69d9026449e97726ce1a315b59e undefined Climate of the Past, Vol 18, Pp 293-312 (2022) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2022 fttriple https://doi.org/10.5194/cp-18-293-2022 2023-01-22T17:50:17Z The geologic record of mountain glaciations is a robust indicator of terrestrial paleoclimate change. During the last glaciation, mountain ranges across the western US hosted glaciers while the Cordilleran and Laurentide ice sheets flowed to the west and east of the continental divide, respectively. Records detailing the chronologies and paleoclimate significance of these ice advances have been developed for many sites across North America. However, relatively few glacial records have been developed for mountain glaciers in the northern Rocky Mountains near former ice sheet margins. Here, we report cosmogenic beryllium-10 surface exposure ages and numerical glacier modeling results, which show that mountain glaciers in the northern Rockies abandoned terminal moraines after the end of the global Last Glacial Maximum around 17–18 ka and could have been sustained by −10 to −8.5 ∘C temperature depressions relative to modern assuming similar or less than modern precipitation. Additionally, we present a deglacial chronology from the northern Rocky Mountains that indicates while there is considerable variability in initial moraine abandonment ages across the Rocky Mountains, the pace of subsequent ice retreat through the late glacial exhibits some regional coherence. Our results provide insight on potential regional mechanisms driving the initiation of and sustained deglaciation in the western US, including rising atmospheric CO2 and ice sheet collapse. Article in Journal/Newspaper Ice Sheet Unknown Northern Rockies ENVELOPE(-123.446,-123.446,59.074,59.074) Climate of the Past 18 2 293 312 |
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English |
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geo envir B. J. Quirk E. Huss B. J. C. Laabs E. Leonard J. Licciardi M. A. Plummer M. W. Caffee Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains |
topic_facet |
geo envir |
description |
The geologic record of mountain glaciations is a robust indicator of terrestrial paleoclimate change. During the last glaciation, mountain ranges across the western US hosted glaciers while the Cordilleran and Laurentide ice sheets flowed to the west and east of the continental divide, respectively. Records detailing the chronologies and paleoclimate significance of these ice advances have been developed for many sites across North America. However, relatively few glacial records have been developed for mountain glaciers in the northern Rocky Mountains near former ice sheet margins. Here, we report cosmogenic beryllium-10 surface exposure ages and numerical glacier modeling results, which show that mountain glaciers in the northern Rockies abandoned terminal moraines after the end of the global Last Glacial Maximum around 17–18 ka and could have been sustained by −10 to −8.5 ∘C temperature depressions relative to modern assuming similar or less than modern precipitation. Additionally, we present a deglacial chronology from the northern Rocky Mountains that indicates while there is considerable variability in initial moraine abandonment ages across the Rocky Mountains, the pace of subsequent ice retreat through the late glacial exhibits some regional coherence. Our results provide insight on potential regional mechanisms driving the initiation of and sustained deglaciation in the western US, including rising atmospheric CO2 and ice sheet collapse. |
format |
Article in Journal/Newspaper |
author |
B. J. Quirk E. Huss B. J. C. Laabs E. Leonard J. Licciardi M. A. Plummer M. W. Caffee |
author_facet |
B. J. Quirk E. Huss B. J. C. Laabs E. Leonard J. Licciardi M. A. Plummer M. W. Caffee |
author_sort |
B. J. Quirk |
title |
Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains |
title_short |
Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains |
title_full |
Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains |
title_fullStr |
Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains |
title_full_unstemmed |
Late Pleistocene glacial chronologies and paleoclimate in the northern Rocky Mountains |
title_sort |
late pleistocene glacial chronologies and paleoclimate in the northern rocky mountains |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/cp-18-293-2022 https://cp.copernicus.org/articles/18/293/2022/cp-18-293-2022.pdf https://doaj.org/article/d196f69d9026449e97726ce1a315b59e |
long_lat |
ENVELOPE(-123.446,-123.446,59.074,59.074) |
geographic |
Northern Rockies |
geographic_facet |
Northern Rockies |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Climate of the Past, Vol 18, Pp 293-312 (2022) |
op_relation |
doi:10.5194/cp-18-293-2022 1814-9324 1814-9332 https://cp.copernicus.org/articles/18/293/2022/cp-18-293-2022.pdf https://doaj.org/article/d196f69d9026449e97726ce1a315b59e |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-18-293-2022 |
container_title |
Climate of the Past |
container_volume |
18 |
container_issue |
2 |
container_start_page |
293 |
op_container_end_page |
312 |
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1766030935686381568 |