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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ftleibnizopen:oai:oai.leibnizopen.de:RECQhIgBdbrxVwz6LoLq 2023-06-18T03:41:11+02:00 The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle Liakka, Johan Löfverström, Marcus Colleoni, Florence 2016 https://repository.publisso.de/resource/frl:6406963 https://doi.org/10.5194/cp-12-1225-2016 https://doi.org/10.5194/cp-12-1225-2016-supplement eng eng http:/creativecommons.org/licenses/by/3.0/ Climate of the past, 12(5):1225-1241 2016 ftleibnizopen https://doi.org/10.5194/cp-12-1225-201610.5194/cp-12-1225-2016-supplement 2023-06-04T23:12:21Z 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 ... Other/Unknown Material Ice Sheet Siberia LeibnizOpen (The Leibniz Association) |
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Open Polar |
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LeibnizOpen (The Leibniz Association) |
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ftleibnizopen |
language |
English |
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 ... |
author |
Liakka, Johan Löfverström, Marcus Colleoni, Florence |
spellingShingle |
Liakka, Johan Löfverström, Marcus Colleoni, Florence The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle |
author_facet |
Liakka, Johan Löfverström, Marcus Colleoni, Florence |
author_sort |
Liakka, Johan |
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 |
publishDate |
2016 |
url |
https://repository.publisso.de/resource/frl:6406963 https://doi.org/10.5194/cp-12-1225-2016 https://doi.org/10.5194/cp-12-1225-2016-supplement |
genre |
Ice Sheet Siberia |
genre_facet |
Ice Sheet Siberia |
op_source |
Climate of the past, 12(5):1225-1241 |
op_rights |
http:/creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.5194/cp-12-1225-201610.5194/cp-12-1225-2016-supplement |
_version_ |
1769006660697718784 |