Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters
During the Last Glacial Maximum (LGM), tidal dissipation was about 3-fold higher than today, which could have led to a considerable increase in vertical mixing. This increase might have enhanced the glacial Atlantic Meridional Overturning Circulation (AMOC), contradicting the shoaled AMOC indicated...
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ftdoajarticles:oai:doaj.org/article:b741bff054b344d7940f9082f1921cb2 2024-09-30T14:24:06+00:00 Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters Y. Chen P. Song X. Chen G. Lohmann 2024-09-01T00:00:00Z https://doi.org/10.5194/cp-20-2001-2024 https://doaj.org/article/b741bff054b344d7940f9082f1921cb2 EN eng Copernicus Publications https://cp.copernicus.org/articles/20/2001/2024/cp-20-2001-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-2001-2024 1814-9324 1814-9332 https://doaj.org/article/b741bff054b344d7940f9082f1921cb2 Climate of the Past, Vol 20, Pp 2001-2015 (2024) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2024 ftdoajarticles https://doi.org/10.5194/cp-20-2001-2024 2024-09-17T16:00:46Z During the Last Glacial Maximum (LGM), tidal dissipation was about 3-fold higher than today, which could have led to a considerable increase in vertical mixing. This increase might have enhanced the glacial Atlantic Meridional Overturning Circulation (AMOC), contradicting the shoaled AMOC indicated by paleoproxies. Here, we conduct ocean model simulations to investigate the impact of background climate conditions and tidal mixing on the AMOC during the LGM. We successfully reproduce the stratified ocean characteristics of the LGM by accurately simulating the elevated salinity of the deep sea and the rapid temperature decrease in the ocean's upper layers. Our findings indicate that the shoaled glacial AMOC is mainly due to strong glacial-ocean stratification, regardless of enhanced tidal dissipation. However, glacial tidal dissipation plays a critical role in the intensification of Antarctic Bottom Water (AABW) during the LGM. Given the critical role of the AMOC in (de-)glacial climate evolution, our results highlight the complex interactions of ocean stratification and tidal dissipation that have been neglected so far. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic Climate of the Past 20 9 2001 2015 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 Y. Chen P. Song X. Chen G. Lohmann Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
During the Last Glacial Maximum (LGM), tidal dissipation was about 3-fold higher than today, which could have led to a considerable increase in vertical mixing. This increase might have enhanced the glacial Atlantic Meridional Overturning Circulation (AMOC), contradicting the shoaled AMOC indicated by paleoproxies. Here, we conduct ocean model simulations to investigate the impact of background climate conditions and tidal mixing on the AMOC during the LGM. We successfully reproduce the stratified ocean characteristics of the LGM by accurately simulating the elevated salinity of the deep sea and the rapid temperature decrease in the ocean's upper layers. Our findings indicate that the shoaled glacial AMOC is mainly due to strong glacial-ocean stratification, regardless of enhanced tidal dissipation. However, glacial tidal dissipation plays a critical role in the intensification of Antarctic Bottom Water (AABW) during the LGM. Given the critical role of the AMOC in (de-)glacial climate evolution, our results highlight the complex interactions of ocean stratification and tidal dissipation that have been neglected so far. |
format |
Article in Journal/Newspaper |
author |
Y. Chen P. Song X. Chen G. Lohmann |
author_facet |
Y. Chen P. Song X. Chen G. Lohmann |
author_sort |
Y. Chen |
title |
Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters |
title_short |
Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters |
title_full |
Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters |
title_fullStr |
Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters |
title_full_unstemmed |
Glacial AMOC shoaling despite vigorous tidal dissipation: vertical stratification matters |
title_sort |
glacial amoc shoaling despite vigorous tidal dissipation: vertical stratification matters |
publisher |
Copernicus Publications |
publishDate |
2024 |
url |
https://doi.org/10.5194/cp-20-2001-2024 https://doaj.org/article/b741bff054b344d7940f9082f1921cb2 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Climate of the Past, Vol 20, Pp 2001-2015 (2024) |
op_relation |
https://cp.copernicus.org/articles/20/2001/2024/cp-20-2001-2024.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-20-2001-2024 1814-9324 1814-9332 https://doaj.org/article/b741bff054b344d7940f9082f1921cb2 |
op_doi |
https://doi.org/10.5194/cp-20-2001-2024 |
container_title |
Climate of the Past |
container_volume |
20 |
container_issue |
9 |
container_start_page |
2001 |
op_container_end_page |
2015 |
_version_ |
1811639661372637184 |