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: | https://doi.org/10.5194/cp-10-269-2014 https://cp.copernicus.org/articles/10/269/2014/ |
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fttriple:oai:gotriple.eu:v57UzjcuygP2_ZdbuSPCC 2023-05-15T16:40:20+02:00 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. 2018-09-27 https://doi.org/10.5194/cp-10-269-2014 https://cp.copernicus.org/articles/10/269/2014/ en eng Copernicus Publications doi:10.5194/cp-10-269-2014 10670/1.276b6o 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/269/2014/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-10-269-2014 2023-01-22T17:52:15Z 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 thermo-mechanical 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 Unknown Climate of the Past 10 1 269 291 |
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geo envir 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 |
geo envir |
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 thermo-mechanical 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. |
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 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-10-269-2014 https://cp.copernicus.org/articles/10/269/2014/ |
genre |
Ice Sheet Sea ice |
genre_facet |
Ice Sheet Sea ice |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-10-269-2014 10670/1.276b6o 1814-9324 1814-9332 https://cp.copernicus.org/articles/10/269/2014/ |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-10-269-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
1 |
container_start_page |
269 |
op_container_end_page |
291 |
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1766030718427725824 |