Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model
The last glacial period (LGP; ca. 110–10 kyr BP) was marked by the existence of two types of abrupt climatic changes, Dansgaard–Oeschger (DO) and Heinrich (H) events. Although the mechanisms behind these are not fully understood, it is generally accepted that the presence of ice sheets played an imp...
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Online Access: | https://doi.org/10.5194/cp-15-957-2019 https://www.clim-past.net/15/957/2019/cp-15-957-2019.pdf https://doaj.org/article/3e96dc11496c40f984d724bf5a732816 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:3e96dc11496c40f984d724bf5a732816 2023-05-15T16:40:11+02:00 Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model J. Alvarez-Solas R. Banderas A. Robinson M. Montoya 2019-06-01 https://doi.org/10.5194/cp-15-957-2019 https://www.clim-past.net/15/957/2019/cp-15-957-2019.pdf https://doaj.org/article/3e96dc11496c40f984d724bf5a732816 en eng Copernicus Publications doi:10.5194/cp-15-957-2019 1814-9324 1814-9332 https://www.clim-past.net/15/957/2019/cp-15-957-2019.pdf https://doaj.org/article/3e96dc11496c40f984d724bf5a732816 undefined Climate of the Past, Vol 15, Pp 957-979 (2019) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2019 fttriple https://doi.org/10.5194/cp-15-957-2019 2023-01-22T17:53:07Z The last glacial period (LGP; ca. 110–10 kyr BP) was marked by the existence of two types of abrupt climatic changes, Dansgaard–Oeschger (DO) and Heinrich (H) events. Although the mechanisms behind these are not fully understood, it is generally accepted that the presence of ice sheets played an important role in their occurrence. While an important effort has been made to investigate the dynamics and evolution of the Laurentide ice sheet (LIS) during this period, the Eurasian ice sheet (EIS) has not received much attention, in particular from a modeling perspective. However, meltwater discharge from this and other ice sheets surrounding the Nordic seas is often implied as a potential cause of ocean instabilities that lead to glacial abrupt climate changes. Thus, a better comprehension of the evolution of the EIS during the LGP is important to understand its role in glacial abrupt climate changes. Here we investigate the response of the EIS to millennial-scale climate variability during the LGP. We use a hybrid, three-dimensional, thermomechanical ice-sheet model that includes ice shelves and ice streams. The model is forced off-line via a novel perturbative approach that, as opposed to conventional methods, clearly differentiates between the spatial patterns of millennial-scale and orbital-scale climate variability. Thus, it provides a more realistic treatment of the forcing at millennial timescales. The effect of both atmospheric and oceanic variations are included. Our results show that the EIS responds with enhanced ice discharge in phase with interstadial warming in the North Atlantic when forced with surface ocean temperatures. Conversely, when subsurface ocean temperatures are used, enhanced ice discharge occurs both during stadials and at the beginning of the interstadials. Separating the atmospheric and oceanic effects demonstrates the major role of the ocean in controlling the dynamics of the EIS on millennial timescales. While the atmospheric forcing alone is only able to produce modest iceberg ... Article in Journal/Newspaper Ice Sheet Ice Shelves Nordic Seas North Atlantic Unknown Climate of the Past 15 3 957 979 |
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envir geo J. Alvarez-Solas R. Banderas A. Robinson M. Montoya Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model |
topic_facet |
envir geo |
description |
The last glacial period (LGP; ca. 110–10 kyr BP) was marked by the existence of two types of abrupt climatic changes, Dansgaard–Oeschger (DO) and Heinrich (H) events. Although the mechanisms behind these are not fully understood, it is generally accepted that the presence of ice sheets played an important role in their occurrence. While an important effort has been made to investigate the dynamics and evolution of the Laurentide ice sheet (LIS) during this period, the Eurasian ice sheet (EIS) has not received much attention, in particular from a modeling perspective. However, meltwater discharge from this and other ice sheets surrounding the Nordic seas is often implied as a potential cause of ocean instabilities that lead to glacial abrupt climate changes. Thus, a better comprehension of the evolution of the EIS during the LGP is important to understand its role in glacial abrupt climate changes. Here we investigate the response of the EIS to millennial-scale climate variability during the LGP. We use a hybrid, three-dimensional, thermomechanical ice-sheet model that includes ice shelves and ice streams. The model is forced off-line via a novel perturbative approach that, as opposed to conventional methods, clearly differentiates between the spatial patterns of millennial-scale and orbital-scale climate variability. Thus, it provides a more realistic treatment of the forcing at millennial timescales. The effect of both atmospheric and oceanic variations are included. Our results show that the EIS responds with enhanced ice discharge in phase with interstadial warming in the North Atlantic when forced with surface ocean temperatures. Conversely, when subsurface ocean temperatures are used, enhanced ice discharge occurs both during stadials and at the beginning of the interstadials. Separating the atmospheric and oceanic effects demonstrates the major role of the ocean in controlling the dynamics of the EIS on millennial timescales. While the atmospheric forcing alone is only able to produce modest iceberg ... |
format |
Article in Journal/Newspaper |
author |
J. Alvarez-Solas R. Banderas A. Robinson M. Montoya |
author_facet |
J. Alvarez-Solas R. Banderas A. Robinson M. Montoya |
author_sort |
J. Alvarez-Solas |
title |
Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model |
title_short |
Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model |
title_full |
Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model |
title_fullStr |
Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model |
title_full_unstemmed |
Ocean-driven millennial-scale variability of the Eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model |
title_sort |
ocean-driven millennial-scale variability of the eurasian ice sheet during the last glacial period simulated with a hybrid ice-sheet–shelf model |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/cp-15-957-2019 https://www.clim-past.net/15/957/2019/cp-15-957-2019.pdf https://doaj.org/article/3e96dc11496c40f984d724bf5a732816 |
genre |
Ice Sheet Ice Shelves Nordic Seas North Atlantic |
genre_facet |
Ice Sheet Ice Shelves Nordic Seas North Atlantic |
op_source |
Climate of the Past, Vol 15, Pp 957-979 (2019) |
op_relation |
doi:10.5194/cp-15-957-2019 1814-9324 1814-9332 https://www.clim-past.net/15/957/2019/cp-15-957-2019.pdf https://doaj.org/article/3e96dc11496c40f984d724bf5a732816 |
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undefined |
op_doi |
https://doi.org/10.5194/cp-15-957-2019 |
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Climate of the Past |
container_volume |
15 |
container_issue |
3 |
container_start_page |
957 |
op_container_end_page |
979 |
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