Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future
The Atlantic Meridional Overturning Circulation (AMOC) has changed dramatically during the glacial–interglacial cycle. One leading hypothesis for these abrupt changes is thermohaline instability. Here, I review recent progress towards understanding thermohaline instability in both observations and m...
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ftdoajarticles:oai:doaj.org/article:8a8cb5a6041740f9afe4bf5bbbc67c87 2023-07-23T04:20:32+02:00 Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future Zhengyu Liu 2023-06-01T00:00:00Z https://doi.org/10.3390/atmos14061011 https://doaj.org/article/8a8cb5a6041740f9afe4bf5bbbc67c87 EN eng MDPI AG https://www.mdpi.com/2073-4433/14/6/1011 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14061011 2073-4433 https://doaj.org/article/8a8cb5a6041740f9afe4bf5bbbc67c87 Atmosphere, Vol 14, Iss 1011, p 1011 (2023) thermohaline instability model bias abrupt changes Meteorology. Climatology QC851-999 article 2023 ftdoajarticles https://doi.org/10.3390/atmos14061011 2023-07-02T00:39:01Z The Atlantic Meridional Overturning Circulation (AMOC) has changed dramatically during the glacial–interglacial cycle. One leading hypothesis for these abrupt changes is thermohaline instability. Here, I review recent progress towards understanding thermohaline instability in both observations and modelling. Proxy records available seem to favor thermohaline instability as the cause of the abrupt climate changes during the glacial–deglacial period because the deep North Atlantic water mass and AMOC seemed to have changed before the North Atlantic climate. However, most fully Coupled General Circulation Models (CGCMs) so far seem to exhibit monostable AMOC, because (1) these models have failed to simulate abrupt AMOC changes unless they are forced by an abrupt change of external forcing and, (2) these models have shown opposite freshwater convergence from the current observations. This potential model bias in the AMOC stability leaves the model projection of the future AMOC change uncertain. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Atmosphere 14 6 1011 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
thermohaline instability model bias abrupt changes Meteorology. Climatology QC851-999 |
spellingShingle |
thermohaline instability model bias abrupt changes Meteorology. Climatology QC851-999 Zhengyu Liu Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future |
topic_facet |
thermohaline instability model bias abrupt changes Meteorology. Climatology QC851-999 |
description |
The Atlantic Meridional Overturning Circulation (AMOC) has changed dramatically during the glacial–interglacial cycle. One leading hypothesis for these abrupt changes is thermohaline instability. Here, I review recent progress towards understanding thermohaline instability in both observations and modelling. Proxy records available seem to favor thermohaline instability as the cause of the abrupt climate changes during the glacial–deglacial period because the deep North Atlantic water mass and AMOC seemed to have changed before the North Atlantic climate. However, most fully Coupled General Circulation Models (CGCMs) so far seem to exhibit monostable AMOC, because (1) these models have failed to simulate abrupt AMOC changes unless they are forced by an abrupt change of external forcing and, (2) these models have shown opposite freshwater convergence from the current observations. This potential model bias in the AMOC stability leaves the model projection of the future AMOC change uncertain. |
format |
Article in Journal/Newspaper |
author |
Zhengyu Liu |
author_facet |
Zhengyu Liu |
author_sort |
Zhengyu Liu |
title |
Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future |
title_short |
Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future |
title_full |
Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future |
title_fullStr |
Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future |
title_full_unstemmed |
Instability of Atlantic Meridional Overturning Circulation: Observations, Modelling and Relevance to Present and Future |
title_sort |
instability of atlantic meridional overturning circulation: observations, modelling and relevance to present and future |
publisher |
MDPI AG |
publishDate |
2023 |
url |
https://doi.org/10.3390/atmos14061011 https://doaj.org/article/8a8cb5a6041740f9afe4bf5bbbc67c87 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Atmosphere, Vol 14, Iss 1011, p 1011 (2023) |
op_relation |
https://www.mdpi.com/2073-4433/14/6/1011 https://doaj.org/toc/2073-4433 doi:10.3390/atmos14061011 2073-4433 https://doaj.org/article/8a8cb5a6041740f9afe4bf5bbbc67c87 |
op_doi |
https://doi.org/10.3390/atmos14061011 |
container_title |
Atmosphere |
container_volume |
14 |
container_issue |
6 |
container_start_page |
1011 |
_version_ |
1772184960866713600 |