Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions
The present manuscript compares Marine Isotope Stage 5 (MIS 5, 125-115 kyr BP) and MIS 7 (236-229 kyr BP) with the aim to investigate the origin of the difference in ice-sheet growth over the Northern Hemisphere high latitudes between these last two inceptions. Our approach combines a low resolution...
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Online Access: | http://hdl.handle.net/11585/783896 https://doi.org/10.5194/cp-10-269-2014 |
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ftunibolognairis:oai:cris.unibo.it:11585/783896 2024-02-11T10:04:50+01:00 Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions Colleoni F Masina S Cherchi A Navarra A Ritz C Peyaud V Otto-Bliesner B Colleoni F Masina S Cherchi A Navarra A Ritz C Peyaud V Otto-Bliesner B 2014 ELETTRONICO http://hdl.handle.net/11585/783896 https://doi.org/10.5194/cp-10-269-2014 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000333837600019 volume:10 issue:1 firstpage:269 lastpage:291 numberofpages:23 journal:CLIMATE OF THE PAST http://hdl.handle.net/11585/783896 doi:10.5194/cp-10-269-2014 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84919595217 MIS5 ice ages climate info:eu-repo/semantics/article 2014 ftunibolognairis https://doi.org/10.5194/cp-10-269-2014 2024-01-24T17:57:03Z The present manuscript compares Marine Isotope Stage 5 (MIS 5, 125-115 kyr BP) and MIS 7 (236-229 kyr BP) with the aim to investigate the origin of the difference in ice-sheet growth over the Northern Hemisphere high latitudes between these last two inceptions. Our approach combines a low resolution coupled atmosphere-ocean-sea-ice general circulation model and a 3-D thermomechanical ice-sheet model to simulate the state of the ice sheets associated with the inception climate states of MIS 5 and MIS 7. Our results show that external forcing (orbitals and GHG) and sea-ice albedo feedbacks are the main factors responsible for the difference in the land-ice initial state between MIS 5 and MIS 7 and that our cold climate model bias impacts more during a cold inception, such as MIS 7, than during a warm inception, such as MIS 5. In addition, if proper ice-elevation and albedo feedbacks are not taken into consideration, the evolution towards glacial inception is hardly simulated, especially for MIS 7. Finally, results highlight that while simulated ice volumes for MIS 5 glacial inception almost fit with paleo-reconstructions, the lack of precipitation over high latitudes, identified as a bias of our climate model, does not allow for a proper simulation of MIS 7 glacial inception. Article in Journal/Newspaper Ice Sheet Sea ice IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) Climate of the Past 10 1 269 291 |
institution |
Open Polar |
collection |
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System) |
op_collection_id |
ftunibolognairis |
language |
English |
topic |
MIS5 ice ages climate |
spellingShingle |
MIS5 ice ages climate Colleoni F Masina S Cherchi A Navarra A Ritz C Peyaud V Otto-Bliesner B Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions |
topic_facet |
MIS5 ice ages climate |
description |
The present manuscript compares Marine Isotope Stage 5 (MIS 5, 125-115 kyr BP) and MIS 7 (236-229 kyr BP) with the aim to investigate the origin of the difference in ice-sheet growth over the Northern Hemisphere high latitudes between these last two inceptions. Our approach combines a low resolution coupled atmosphere-ocean-sea-ice general circulation model and a 3-D thermomechanical ice-sheet model to simulate the state of the ice sheets associated with the inception climate states of MIS 5 and MIS 7. Our results show that external forcing (orbitals and GHG) and sea-ice albedo feedbacks are the main factors responsible for the difference in the land-ice initial state between MIS 5 and MIS 7 and that our cold climate model bias impacts more during a cold inception, such as MIS 7, than during a warm inception, such as MIS 5. In addition, if proper ice-elevation and albedo feedbacks are not taken into consideration, the evolution towards glacial inception is hardly simulated, especially for MIS 7. Finally, results highlight that while simulated ice volumes for MIS 5 glacial inception almost fit with paleo-reconstructions, the lack of precipitation over high latitudes, identified as a bias of our climate model, does not allow for a proper simulation of MIS 7 glacial inception. |
author2 |
Colleoni F Masina S Cherchi A Navarra A Ritz C Peyaud V Otto-Bliesner B |
format |
Article in Journal/Newspaper |
author |
Colleoni F Masina S Cherchi A Navarra A Ritz C Peyaud V Otto-Bliesner B |
author_facet |
Colleoni F Masina S Cherchi A Navarra A Ritz C Peyaud V Otto-Bliesner B |
author_sort |
Colleoni F |
title |
Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions |
title_short |
Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions |
title_full |
Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions |
title_fullStr |
Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions |
title_full_unstemmed |
Modeling Northern Hemisphere ice-sheet distribution during MIS 5 and MIS 7 glacial inceptions |
title_sort |
modeling northern hemisphere ice-sheet distribution during mis 5 and mis 7 glacial inceptions |
publishDate |
2014 |
url |
http://hdl.handle.net/11585/783896 https://doi.org/10.5194/cp-10-269-2014 |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000333837600019 volume:10 issue:1 firstpage:269 lastpage:291 numberofpages:23 journal:CLIMATE OF THE PAST http://hdl.handle.net/11585/783896 doi:10.5194/cp-10-269-2014 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84919595217 |
op_doi |
https://doi.org/10.5194/cp-10-269-2014 |
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Climate of the Past |
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10 |
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