Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments
Glacial periods undergo frequent climate shifts between warm interstadials and cold stadials on a millennial timescale. Recent studies show that the duration of these climate modes varies with the background climate; a colder background climate and lower CO2 generally result in a shorter interstadia...
Main Authors: | , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
Freie Universität Berlin
2021
|
Subjects: | |
Online Access: | https://dx.doi.org/10.17169/refubium-32846 https://refubium.fu-berlin.de/handle/fub188/33124 |
id |
ftdatacite:10.17169/refubium-32846 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.17169/refubium-32846 2023-05-15T16:39:27+02:00 Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments Sherriff-Tadano, Sam Abe-Ouchi, Ayako Oka, Akira Mitsui, Takahito Saito, Fuyuki 2021 https://dx.doi.org/10.17169/refubium-32846 https://refubium.fu-berlin.de/handle/fub188/33124 unknown Freie Universität Berlin https://doi.org/10.5194/cp-17-1919-2021 https://dx.doi.org/10.5194/cp-17-1919-2021 https://doi.org/10.5194/cp-17-1919-2021 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY ice sheets marine isotope stages duration of stadials 500 Naturwissenschaften und Mathematik550 Geowissenschaften, Geologie550 Geowissenschaften Wissenschaftlicher Artikel article-journal Text ScholarlyArticle 2021 ftdatacite https://doi.org/10.17169/refubium-32846 https://doi.org/10.5194/cp-17-1919-2021 2022-02-08T17:10:29Z Glacial periods undergo frequent climate shifts between warm interstadials and cold stadials on a millennial timescale. Recent studies show that the duration of these climate modes varies with the background climate; a colder background climate and lower CO2 generally result in a shorter interstadial and a longer stadial through its impact on the Atlantic Meridional Overturning Circulation (AMOC). However, the duration of stadials is shorter during Marine Isotope Stage 3 (MIS3) than during MIS5, despite the colder climate in MIS3, suggesting potential control from other climate factors on the duration of stadials. In this study, we investigate the role of glacial ice sheets. For this purpose, freshwater hosing experiments are conducted with an atmosphere–ocean general circulation model under MIS5a and MIS3 boundary conditions, as well as MIS3 boundary conditions with MIS5a ice sheets. The impact of ice sheet differences on the duration of the stadials is evaluated by comparing recovery times of the AMOC after the freshwater forcing is stopped. These experiments show a slightly shorter recovery time of the AMOC during MIS3 compared with MIS5a, which is consistent with ice core data. We find that larger glacial ice sheets in MIS3 shorten the recovery time. Sensitivity experiments show that stronger surface winds over the North Atlantic shorten the recovery time by increasing the surface salinity and decreasing the sea ice amount in the deepwater formation region, which sets favorable conditions for oceanic convection. In contrast, we also find that surface cooling by larger ice sheets tends to increase the recovery time of the AMOC by increasing the sea ice thickness over the deepwater formation region. Thus, this study suggests that the larger ice sheet during MIS3 compared with MIS5a could have contributed to the shortening of stadials in MIS3, despite the climate being colder than that of MIS5a, because surface wind plays a larger role. Text ice core Ice Sheet North Atlantic Sea ice DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
ice sheets marine isotope stages duration of stadials 500 Naturwissenschaften und Mathematik550 Geowissenschaften, Geologie550 Geowissenschaften |
spellingShingle |
ice sheets marine isotope stages duration of stadials 500 Naturwissenschaften und Mathematik550 Geowissenschaften, Geologie550 Geowissenschaften Sherriff-Tadano, Sam Abe-Ouchi, Ayako Oka, Akira Mitsui, Takahito Saito, Fuyuki Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments |
topic_facet |
ice sheets marine isotope stages duration of stadials 500 Naturwissenschaften und Mathematik550 Geowissenschaften, Geologie550 Geowissenschaften |
description |
Glacial periods undergo frequent climate shifts between warm interstadials and cold stadials on a millennial timescale. Recent studies show that the duration of these climate modes varies with the background climate; a colder background climate and lower CO2 generally result in a shorter interstadial and a longer stadial through its impact on the Atlantic Meridional Overturning Circulation (AMOC). However, the duration of stadials is shorter during Marine Isotope Stage 3 (MIS3) than during MIS5, despite the colder climate in MIS3, suggesting potential control from other climate factors on the duration of stadials. In this study, we investigate the role of glacial ice sheets. For this purpose, freshwater hosing experiments are conducted with an atmosphere–ocean general circulation model under MIS5a and MIS3 boundary conditions, as well as MIS3 boundary conditions with MIS5a ice sheets. The impact of ice sheet differences on the duration of the stadials is evaluated by comparing recovery times of the AMOC after the freshwater forcing is stopped. These experiments show a slightly shorter recovery time of the AMOC during MIS3 compared with MIS5a, which is consistent with ice core data. We find that larger glacial ice sheets in MIS3 shorten the recovery time. Sensitivity experiments show that stronger surface winds over the North Atlantic shorten the recovery time by increasing the surface salinity and decreasing the sea ice amount in the deepwater formation region, which sets favorable conditions for oceanic convection. In contrast, we also find that surface cooling by larger ice sheets tends to increase the recovery time of the AMOC by increasing the sea ice thickness over the deepwater formation region. Thus, this study suggests that the larger ice sheet during MIS3 compared with MIS5a could have contributed to the shortening of stadials in MIS3, despite the climate being colder than that of MIS5a, because surface wind plays a larger role. |
format |
Text |
author |
Sherriff-Tadano, Sam Abe-Ouchi, Ayako Oka, Akira Mitsui, Takahito Saito, Fuyuki |
author_facet |
Sherriff-Tadano, Sam Abe-Ouchi, Ayako Oka, Akira Mitsui, Takahito Saito, Fuyuki |
author_sort |
Sherriff-Tadano, Sam |
title |
Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments |
title_short |
Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments |
title_full |
Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments |
title_fullStr |
Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments |
title_full_unstemmed |
Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials? Implications from hosing experiments |
title_sort |
does a difference in ice sheets between marine isotope stages 3 and 5a affect the duration of stadials? implications from hosing experiments |
publisher |
Freie Universität Berlin |
publishDate |
2021 |
url |
https://dx.doi.org/10.17169/refubium-32846 https://refubium.fu-berlin.de/handle/fub188/33124 |
genre |
ice core Ice Sheet North Atlantic Sea ice |
genre_facet |
ice core Ice Sheet North Atlantic Sea ice |
op_relation |
https://doi.org/10.5194/cp-17-1919-2021 https://dx.doi.org/10.5194/cp-17-1919-2021 https://doi.org/10.5194/cp-17-1919-2021 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.17169/refubium-32846 https://doi.org/10.5194/cp-17-1919-2021 |
_version_ |
1766029804475252736 |