Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle
We present modelling results of the atmospheric circulation at the cold periods of marine isotope stage 5b (MIS 5b), MIS 4 and the Last Glacial Maximum (LGM), as well as the interglacial. The palaeosimulations are forced by ice-sheet reconstructions consistent with geological evidence and by appropr...
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Stockholms universitet, Meteorologiska institutionen (MISU)
2014
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-106949 https://doi.org/10.5194/cp-10-1453-2014 |
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ftstockholmuniv:oai:DiVA.org:su-106949 2023-05-15T16:39:58+02:00 Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle Löfverström, Marcus Caballero, Rodrigo Nilsson, Johan Kleman, Johan 2014 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-106949 https://doi.org/10.5194/cp-10-1453-2014 eng eng Stockholms universitet, Meteorologiska institutionen (MISU) Stockholms universitet, Institutionen för naturgeografi och kvartärgeologi (INK) Climate of the Past, 1814-9324, 2014, 10:4, s. 1453-1471 orcid:0000-0002-5507-9209 orcid:0000-0002-9591-124X http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-106949 doi:10.5194/cp-10-1453-2014 ISI:000339896100012 info:eu-repo/semantics/openAccess Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning Article in journal info:eu-repo/semantics/article text 2014 ftstockholmuniv https://doi.org/10.5194/cp-10-1453-2014 2023-02-23T21:43:46Z We present modelling results of the atmospheric circulation at the cold periods of marine isotope stage 5b (MIS 5b), MIS 4 and the Last Glacial Maximum (LGM), as well as the interglacial. The palaeosimulations are forced by ice-sheet reconstructions consistent with geological evidence and by appropriate insolation and greenhouse gas concentrations. The results suggest that the large-scale atmospheric winter circulation remained largely similar to the interglacial for a significant part of the glacial cycle. The proposed explanation is that the ice sheets were located in areas where their interaction with the mean flow is limited. However, the LGM Laurentide Ice Sheet induces a much larger planetary wave that leads to a zonalisation of the Atlantic jet. In summer, the ice-sheet topography dynamically induces warm temperatures in Alaska and central Asia that inhibits the expansion of the ice sheets into these regions. The warm temperatures may also serve as an explanation for westward propagation of the Eurasian Ice Sheet from MIS 4 to the LGM. Article in Journal/Newspaper Ice Sheet Alaska Stockholm University: Publications (DiVA) Climate of the Past 10 4 1453 1471 |
institution |
Open Polar |
collection |
Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
spellingShingle |
Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning Löfverström, Marcus Caballero, Rodrigo Nilsson, Johan Kleman, Johan Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
topic_facet |
Meteorology and Atmospheric Sciences Meteorologi och atmosfärforskning |
description |
We present modelling results of the atmospheric circulation at the cold periods of marine isotope stage 5b (MIS 5b), MIS 4 and the Last Glacial Maximum (LGM), as well as the interglacial. The palaeosimulations are forced by ice-sheet reconstructions consistent with geological evidence and by appropriate insolation and greenhouse gas concentrations. The results suggest that the large-scale atmospheric winter circulation remained largely similar to the interglacial for a significant part of the glacial cycle. The proposed explanation is that the ice sheets were located in areas where their interaction with the mean flow is limited. However, the LGM Laurentide Ice Sheet induces a much larger planetary wave that leads to a zonalisation of the Atlantic jet. In summer, the ice-sheet topography dynamically induces warm temperatures in Alaska and central Asia that inhibits the expansion of the ice sheets into these regions. The warm temperatures may also serve as an explanation for westward propagation of the Eurasian Ice Sheet from MIS 4 to the LGM. |
format |
Article in Journal/Newspaper |
author |
Löfverström, Marcus Caballero, Rodrigo Nilsson, Johan Kleman, Johan |
author_facet |
Löfverström, Marcus Caballero, Rodrigo Nilsson, Johan Kleman, Johan |
author_sort |
Löfverström, Marcus |
title |
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
title_short |
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
title_full |
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
title_fullStr |
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
title_full_unstemmed |
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
title_sort |
evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle |
publisher |
Stockholms universitet, Meteorologiska institutionen (MISU) |
publishDate |
2014 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-106949 https://doi.org/10.5194/cp-10-1453-2014 |
genre |
Ice Sheet Alaska |
genre_facet |
Ice Sheet Alaska |
op_relation |
Climate of the Past, 1814-9324, 2014, 10:4, s. 1453-1471 orcid:0000-0002-5507-9209 orcid:0000-0002-9591-124X http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-106949 doi:10.5194/cp-10-1453-2014 ISI:000339896100012 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-10-1453-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
4 |
container_start_page |
1453 |
op_container_end_page |
1471 |
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1766030313588260864 |