The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region
Using a highly resolved atmospheric general circulation model, the impact of different glacial boundary conditions on precipitation and atmospheric dynamics in the North Atlantic region is investigated. Six 30-yr time slice experiments of the Last Glacial Maximum at 21 thousand years before the pres...
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Language: | English |
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Online Access: | https://boris.unibe.ch/18171/1/cp-8-935-2012.pdf https://boris.unibe.ch/18171/ |
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ftunivbern:oai:boris.unibe.ch:18171 2023-08-20T04:07:14+02:00 The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region Hofer, D. Raible, C.C. Dehnert, A. Kuhlemann, J. 2012 application/pdf https://boris.unibe.ch/18171/1/cp-8-935-2012.pdf https://boris.unibe.ch/18171/ eng eng Copernicus Publications https://boris.unibe.ch/18171/ info:eu-repo/semantics/openAccess Hofer, D.; Raible, C.C.; Dehnert, A.; Kuhlemann, J. (2012). The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region. Climate of the past, 8(3), pp. 935-949. Göttingen: Copernicus Publications 10.5194/cp-8-935-2012 <http://dx.doi.org/10.5194/cp-8-935-2012> info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 2012 ftunivbern https://doi.org/10.5194/cp-8-935-2012 2023-07-31T20:42:21Z Using a highly resolved atmospheric general circulation model, the impact of different glacial boundary conditions on precipitation and atmospheric dynamics in the North Atlantic region is investigated. Six 30-yr time slice experiments of the Last Glacial Maximum at 21 thousand years before the present (ka BP) and of a less pronounced glacial state – the Middle Weichselian (65 ka BP) – are compared to analyse the sensitivity to changes in the ice sheet distribution, in the radiative forcing and in the prescribed time-varying sea surface temperature and sea ice, which are taken from a lower-resolved, but fully coupled atmosphere-ocean general circulation model. The strongest differences are found for simulations with different heights of the Laurentide ice sheet. A high surface elevation of the Laurentide ice sheet leads to a southward displacement of the jet stream and the storm track in the North Atlantic region. These changes in the atmospheric dynamics generate a band of increased precipitation in the mid-latitudes across the Atlantic to southern Europe in winter, while the precipitation pattern in summer is only marginally affected. The impact of the radiative forcing differences between the two glacial periods and of the prescribed time-varying sea surface temperatures and sea ice are of second order importance compared to the one of the Laurentide ice sheet. They affect the atmospheric dynamics and precipitation in a similar but less pronounced manner compared with the topographic changes. Article in Journal/Newspaper Ice Sheet North Atlantic Sea ice BORIS (Bern Open Repository and Information System, University of Bern) Climate of the Past 8 3 935 949 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
description |
Using a highly resolved atmospheric general circulation model, the impact of different glacial boundary conditions on precipitation and atmospheric dynamics in the North Atlantic region is investigated. Six 30-yr time slice experiments of the Last Glacial Maximum at 21 thousand years before the present (ka BP) and of a less pronounced glacial state – the Middle Weichselian (65 ka BP) – are compared to analyse the sensitivity to changes in the ice sheet distribution, in the radiative forcing and in the prescribed time-varying sea surface temperature and sea ice, which are taken from a lower-resolved, but fully coupled atmosphere-ocean general circulation model. The strongest differences are found for simulations with different heights of the Laurentide ice sheet. A high surface elevation of the Laurentide ice sheet leads to a southward displacement of the jet stream and the storm track in the North Atlantic region. These changes in the atmospheric dynamics generate a band of increased precipitation in the mid-latitudes across the Atlantic to southern Europe in winter, while the precipitation pattern in summer is only marginally affected. The impact of the radiative forcing differences between the two glacial periods and of the prescribed time-varying sea surface temperatures and sea ice are of second order importance compared to the one of the Laurentide ice sheet. They affect the atmospheric dynamics and precipitation in a similar but less pronounced manner compared with the topographic changes. |
format |
Article in Journal/Newspaper |
author |
Hofer, D. Raible, C.C. Dehnert, A. Kuhlemann, J. |
spellingShingle |
Hofer, D. Raible, C.C. Dehnert, A. Kuhlemann, J. The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region |
author_facet |
Hofer, D. Raible, C.C. Dehnert, A. Kuhlemann, J. |
author_sort |
Hofer, D. |
title |
The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region |
title_short |
The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region |
title_full |
The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region |
title_fullStr |
The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region |
title_full_unstemmed |
The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region |
title_sort |
impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the north atlantic region |
publisher |
Copernicus Publications |
publishDate |
2012 |
url |
https://boris.unibe.ch/18171/1/cp-8-935-2012.pdf https://boris.unibe.ch/18171/ |
genre |
Ice Sheet North Atlantic Sea ice |
genre_facet |
Ice Sheet North Atlantic Sea ice |
op_source |
Hofer, D.; Raible, C.C.; Dehnert, A.; Kuhlemann, J. (2012). The impact of different glacial boundary conditions on atmospheric dynamics and precipitation in the North Atlantic region. Climate of the past, 8(3), pp. 935-949. Göttingen: Copernicus Publications 10.5194/cp-8-935-2012 <http://dx.doi.org/10.5194/cp-8-935-2012> |
op_relation |
https://boris.unibe.ch/18171/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-8-935-2012 |
container_title |
Climate of the Past |
container_volume |
8 |
container_issue |
3 |
container_start_page |
935 |
op_container_end_page |
949 |
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1774718718441422848 |