Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability
It has been suggested that freshwater transports by the Atlantic Meridional Overturning Circulation (AMOC) in the South Atlantic may be a useful metric for determining the stability of the AMOC because it can lead to feedbacks onto North Atlantic salinities and hence deep water formation. In this ma...
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ftdoajarticles:oai:doaj.org/article:be1684e34a6a41dfb5abbdc667bb9d73 2023-05-15T17:31:05+02:00 Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability Keith Haines David Ferreira Davi Mignac 2022-03-01T00:00:00Z https://doi.org/10.3389/fmars.2022.830821 https://doaj.org/article/be1684e34a6a41dfb5abbdc667bb9d73 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.830821/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.830821 https://doaj.org/article/be1684e34a6a41dfb5abbdc667bb9d73 Frontiers in Marine Science, Vol 9 (2022) Atlantic freshwater AMOC stability CMIP5 models southern FOV Atlantic salinity balance Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2022 ftdoajarticles https://doi.org/10.3389/fmars.2022.830821 2022-12-31T04:52:31Z It has been suggested that freshwater transports by the Atlantic Meridional Overturning Circulation (AMOC) in the South Atlantic may be a useful metric for determining the stability of the AMOC because it can lead to feedbacks onto North Atlantic salinities and hence deep water formation. In this manuscript we investigate feedbacks between South Atlantic Freshwater transports, Freshwater content and AMOC transport contributions across different Atlantic latitudes, and at different timescales in centennial runs of 10 CMIP5 climate models, with both northward and southward AMOC freshwater transports in the South Atlantic. In all models, salinity variations are more important than AMOC variations in determining South Atlantic freshwater transports, especially on longer timescales >10 years. Only in the North Atlantic do AMOC variations become important in changing the meridional freshwater transports, which might then lead to feedbacks with stability implications. Closed budgets of Freshwater content show that South Atlantic transports only influence local freshwater budgets (within ∼10° latitude) and that variations in horizontal transports by the South Atlantic gyre always dominate the overturning transports in all models and timescales. These results suggest that South Atlantic freshwater transports by the AMOC is highly unlikely to be a useful metric in determining AMOC stability as meridional freshwater transports are much less meridionally coherent than the AMOC circulation itself in all 10 CMIP5 models studied. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Atlantic freshwater AMOC stability CMIP5 models southern FOV Atlantic salinity balance Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Atlantic freshwater AMOC stability CMIP5 models southern FOV Atlantic salinity balance Science Q General. Including nature conservation geographical distribution QH1-199.5 Keith Haines David Ferreira Davi Mignac Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability |
topic_facet |
Atlantic freshwater AMOC stability CMIP5 models southern FOV Atlantic salinity balance Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
It has been suggested that freshwater transports by the Atlantic Meridional Overturning Circulation (AMOC) in the South Atlantic may be a useful metric for determining the stability of the AMOC because it can lead to feedbacks onto North Atlantic salinities and hence deep water formation. In this manuscript we investigate feedbacks between South Atlantic Freshwater transports, Freshwater content and AMOC transport contributions across different Atlantic latitudes, and at different timescales in centennial runs of 10 CMIP5 climate models, with both northward and southward AMOC freshwater transports in the South Atlantic. In all models, salinity variations are more important than AMOC variations in determining South Atlantic freshwater transports, especially on longer timescales >10 years. Only in the North Atlantic do AMOC variations become important in changing the meridional freshwater transports, which might then lead to feedbacks with stability implications. Closed budgets of Freshwater content show that South Atlantic transports only influence local freshwater budgets (within ∼10° latitude) and that variations in horizontal transports by the South Atlantic gyre always dominate the overturning transports in all models and timescales. These results suggest that South Atlantic freshwater transports by the AMOC is highly unlikely to be a useful metric in determining AMOC stability as meridional freshwater transports are much less meridionally coherent than the AMOC circulation itself in all 10 CMIP5 models studied. |
format |
Article in Journal/Newspaper |
author |
Keith Haines David Ferreira Davi Mignac |
author_facet |
Keith Haines David Ferreira Davi Mignac |
author_sort |
Keith Haines |
title |
Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability |
title_short |
Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability |
title_full |
Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability |
title_fullStr |
Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability |
title_full_unstemmed |
Variability and Feedbacks in the Atlantic Freshwater Budget of CMIP5 Models With Reference to Atlantic Meridional Overturning Circulation Stability |
title_sort |
variability and feedbacks in the atlantic freshwater budget of cmip5 models with reference to atlantic meridional overturning circulation stability |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.830821 https://doaj.org/article/be1684e34a6a41dfb5abbdc667bb9d73 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Frontiers in Marine Science, Vol 9 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.830821/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.830821 https://doaj.org/article/be1684e34a6a41dfb5abbdc667bb9d73 |
op_doi |
https://doi.org/10.3389/fmars.2022.830821 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
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1766128403989135360 |