The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle
Modeling studies have shown that the continental-scale ice sheets in North America and Eurasia in the last glacial cycle had a large influence on the atmospheric circulation and thus yielded a climate distinctly different from the present. However, to what extent the two ice sheets influenced each o...
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ftdoajarticles:oai:doaj.org/article:3c13f68b03034e38ba1700833fa2020b 2023-05-15T16:39:38+02:00 The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle J. Liakka M. Löfverström F. Colleoni 2016-05-01T00:00:00Z https://doi.org/10.5194/cp-12-1225-2016 https://doaj.org/article/3c13f68b03034e38ba1700833fa2020b EN eng Copernicus Publications http://www.clim-past.net/12/1225/2016/cp-12-1225-2016.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-12-1225-2016 https://doaj.org/article/3c13f68b03034e38ba1700833fa2020b Climate of the Past, Vol 12, Iss 5, Pp 1225-1241 (2016) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2016 ftdoajarticles https://doi.org/10.5194/cp-12-1225-2016 2022-12-31T15:55:23Z Modeling studies have shown that the continental-scale ice sheets in North America and Eurasia in the last glacial cycle had a large influence on the atmospheric circulation and thus yielded a climate distinctly different from the present. However, to what extent the two ice sheets influenced each others' growth trajectories remains largely unexplored. In this study we investigate how an ice sheet in North America influences the downstream evolution of the Eurasian ice sheet, using a thermomechanical ice-sheet model forced by climate data from atmospheric snapshot experiments of three distinctly different phases of the last glacial cycle: the Marine Isotope Stages 5b, 4, and 2 (Last Glacial Maximum – LGM). Owing to the large uncertainty associated with glacial changes in the Atlantic meridional overturning circulation, each atmospheric snapshot experiment was conducted using two distinctly different ocean heat transport representations. Our results suggest that changes in the North American paleo-topography may have largely controlled the zonal distribution of the Eurasian ice sheet. In the MIS4 and LGM experiments, the Eurasian ice sheet migrates westward towards the Atlantic sector – largely consistent with geological data and contemporary ice-sheet reconstructions – due to a low wave number stationary wave response, which yields a cooling in Europe and a warming in northeastern Siberia. The expansion of the North American ice sheet between MIS4 and the LGM amplifies the Siberian warm anomaly, which limits the glaciation there and may therefore help explain the progressive westward migration of the Eurasian ice sheet in this time period. The ocean heat transport only has a small influence on the stationary wave response to the North American glacial topography; however, because temperature anomalies have a smaller influence on an ice sheet's ablation in a colder climate than in a warmer one, the impact of the North American glacial topography on the Eurasian ice-sheet evolution is reduced for colder surface ... Article in Journal/Newspaper Ice Sheet Siberia Directory of Open Access Journals: DOAJ Articles Climate of the Past 12 5 1225 1241 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 J. Liakka M. Löfverström F. Colleoni The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
Modeling studies have shown that the continental-scale ice sheets in North America and Eurasia in the last glacial cycle had a large influence on the atmospheric circulation and thus yielded a climate distinctly different from the present. However, to what extent the two ice sheets influenced each others' growth trajectories remains largely unexplored. In this study we investigate how an ice sheet in North America influences the downstream evolution of the Eurasian ice sheet, using a thermomechanical ice-sheet model forced by climate data from atmospheric snapshot experiments of three distinctly different phases of the last glacial cycle: the Marine Isotope Stages 5b, 4, and 2 (Last Glacial Maximum – LGM). Owing to the large uncertainty associated with glacial changes in the Atlantic meridional overturning circulation, each atmospheric snapshot experiment was conducted using two distinctly different ocean heat transport representations. Our results suggest that changes in the North American paleo-topography may have largely controlled the zonal distribution of the Eurasian ice sheet. In the MIS4 and LGM experiments, the Eurasian ice sheet migrates westward towards the Atlantic sector – largely consistent with geological data and contemporary ice-sheet reconstructions – due to a low wave number stationary wave response, which yields a cooling in Europe and a warming in northeastern Siberia. The expansion of the North American ice sheet between MIS4 and the LGM amplifies the Siberian warm anomaly, which limits the glaciation there and may therefore help explain the progressive westward migration of the Eurasian ice sheet in this time period. The ocean heat transport only has a small influence on the stationary wave response to the North American glacial topography; however, because temperature anomalies have a smaller influence on an ice sheet's ablation in a colder climate than in a warmer one, the impact of the North American glacial topography on the Eurasian ice-sheet evolution is reduced for colder surface ... |
format |
Article in Journal/Newspaper |
author |
J. Liakka M. Löfverström F. Colleoni |
author_facet |
J. Liakka M. Löfverström F. Colleoni |
author_sort |
J. Liakka |
title |
The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle |
title_short |
The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle |
title_full |
The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle |
title_fullStr |
The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle |
title_full_unstemmed |
The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle |
title_sort |
impact of the north american glacial topography on the evolution of the eurasian ice sheet over the last glacial cycle |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/cp-12-1225-2016 https://doaj.org/article/3c13f68b03034e38ba1700833fa2020b |
genre |
Ice Sheet Siberia |
genre_facet |
Ice Sheet Siberia |
op_source |
Climate of the Past, Vol 12, Iss 5, Pp 1225-1241 (2016) |
op_relation |
http://www.clim-past.net/12/1225/2016/cp-12-1225-2016.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-12-1225-2016 https://doaj.org/article/3c13f68b03034e38ba1700833fa2020b |
op_doi |
https://doi.org/10.5194/cp-12-1225-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
5 |
container_start_page |
1225 |
op_container_end_page |
1241 |
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1766029961876996096 |