Mountain uplift and the glaciation of North America – a sensitivity study
The Miocene (~24 to ~5 million years ago) was a period of relative global warmth compared to the Quaternary (~2 million years ago to present; e.g. Zachos et al., 2001) and was characterised by the intermittent glaciation of Antarctica only. Paradoxically, the majority of available proxy data suggest...
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Online Access: | https://doi.org/10.5194/cp-6-707-2010 https://cp.copernicus.org/articles/6/707/2010/ |
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fttriple:oai:gotriple.eu:c7hSc8oAqb-ghFEz771eZ 2023-05-15T13:40:49+02:00 Mountain uplift and the glaciation of North America – a sensitivity study Foster, G. L. Lunt, D. J. Parrish, R. R. 2018-09-27 https://doi.org/10.5194/cp-6-707-2010 https://cp.copernicus.org/articles/6/707/2010/ en eng Copernicus Publications doi:10.5194/cp-6-707-2010 10670/1.ix75ow 1814-9324 1814-9332 https://cp.copernicus.org/articles/6/707/2010/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-6-707-2010 2023-01-22T17:51:59Z The Miocene (~24 to ~5 million years ago) was a period of relative global warmth compared to the Quaternary (~2 million years ago to present; e.g. Zachos et al., 2001) and was characterised by the intermittent glaciation of Antarctica only. Paradoxically, the majority of available proxy data suggest that during the Miocene, pCO2 was similar, or even lower, than the pre-industrial levels (280 ppmv; Pagani et al., 1999; Pearson and Palmer, 2000; Kürschner et al., 1996, 2008) and at times probably crossed the modelled threshold value required for sustained glaciation in the Northern Hemisphere (DeConto et al., 2008). Records of ice rafted debris and the oxygen isotope composition of benthic foraminifera suggest that at several times over the last 25 million years substantial amounts of continental ice did build up in the Northern Hemisphere but none of these led to prolonged glaciation. In this contribution, we review evidence that suggests that in the Miocene the North American Cordillera was, at least in parts, considerably lower than today. We present new GCM simulations that imply that small amounts of uplift of the North American Cordillera result in significant cooling of the northern North American Continent. Offline ice sheet modelling, driven by these GCM outputs, suggests that with a reduced topography, inception of the Cordilleran ice sheet is prohibited. This suggests that uplift of the North American Cordillera in the Late Miocene may have played an important role in priming the climate for the intensification of Northern Hemisphere glaciation in the Late Pliocene. Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Unknown Climate of the Past 6 5 707 717 |
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geo envir Foster, G. L. Lunt, D. J. Parrish, R. R. Mountain uplift and the glaciation of North America – a sensitivity study |
topic_facet |
geo envir |
description |
The Miocene (~24 to ~5 million years ago) was a period of relative global warmth compared to the Quaternary (~2 million years ago to present; e.g. Zachos et al., 2001) and was characterised by the intermittent glaciation of Antarctica only. Paradoxically, the majority of available proxy data suggest that during the Miocene, pCO2 was similar, or even lower, than the pre-industrial levels (280 ppmv; Pagani et al., 1999; Pearson and Palmer, 2000; Kürschner et al., 1996, 2008) and at times probably crossed the modelled threshold value required for sustained glaciation in the Northern Hemisphere (DeConto et al., 2008). Records of ice rafted debris and the oxygen isotope composition of benthic foraminifera suggest that at several times over the last 25 million years substantial amounts of continental ice did build up in the Northern Hemisphere but none of these led to prolonged glaciation. In this contribution, we review evidence that suggests that in the Miocene the North American Cordillera was, at least in parts, considerably lower than today. We present new GCM simulations that imply that small amounts of uplift of the North American Cordillera result in significant cooling of the northern North American Continent. Offline ice sheet modelling, driven by these GCM outputs, suggests that with a reduced topography, inception of the Cordilleran ice sheet is prohibited. This suggests that uplift of the North American Cordillera in the Late Miocene may have played an important role in priming the climate for the intensification of Northern Hemisphere glaciation in the Late Pliocene. |
format |
Article in Journal/Newspaper |
author |
Foster, G. L. Lunt, D. J. Parrish, R. R. |
author_facet |
Foster, G. L. Lunt, D. J. Parrish, R. R. |
author_sort |
Foster, G. L. |
title |
Mountain uplift and the glaciation of North America – a sensitivity study |
title_short |
Mountain uplift and the glaciation of North America – a sensitivity study |
title_full |
Mountain uplift and the glaciation of North America – a sensitivity study |
title_fullStr |
Mountain uplift and the glaciation of North America – a sensitivity study |
title_full_unstemmed |
Mountain uplift and the glaciation of North America – a sensitivity study |
title_sort |
mountain uplift and the glaciation of north america – a sensitivity study |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-6-707-2010 https://cp.copernicus.org/articles/6/707/2010/ |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-6-707-2010 10670/1.ix75ow 1814-9324 1814-9332 https://cp.copernicus.org/articles/6/707/2010/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-6-707-2010 |
container_title |
Climate of the Past |
container_volume |
6 |
container_issue |
5 |
container_start_page |
707 |
op_container_end_page |
717 |
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1766140979957465088 |