The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation
We investigate the respective role of variations in subpolar deep water formation and Nordic Seas overflows for the decadal to multidecadal variability of the Atlantic meridional overturning circulation (AMOC). This is partly done by analysing long (order of 1000 years) control simulations with five...
Published in: | Ocean Science |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2014
|
Subjects: | |
Online Access: | https://doi.org/10.5194/os-10-227-2014 https://doaj.org/article/8b0248658ad4418ab72ed035faee4fd6 |
id |
ftdoajarticles:oai:doaj.org/article:8b0248658ad4418ab72ed035faee4fd6 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:8b0248658ad4418ab72ed035faee4fd6 2023-05-15T16:00:37+02:00 The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation K. Lohmann J. H. Jungclaus D. Matei J. Mignot M. Menary H. R. Langehaug J. Ba Y. Gao O. H. Otterå W. Park S. Lorenz 2014-04-01T00:00:00Z https://doi.org/10.5194/os-10-227-2014 https://doaj.org/article/8b0248658ad4418ab72ed035faee4fd6 EN eng Copernicus Publications http://www.ocean-sci.net/10/227/2014/os-10-227-2014.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-10-227-2014 https://doaj.org/article/8b0248658ad4418ab72ed035faee4fd6 Ocean Science, Vol 10, Iss 2, Pp 227-241 (2014) Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.5194/os-10-227-2014 2022-12-31T12:51:16Z We investigate the respective role of variations in subpolar deep water formation and Nordic Seas overflows for the decadal to multidecadal variability of the Atlantic meridional overturning circulation (AMOC). This is partly done by analysing long (order of 1000 years) control simulations with five coupled climate models. For all models, the maximum influence of variations in subpolar deep water formation is found at about 45° N, while the maximum influence of variations in Nordic Seas overflows is rather found at 55 to 60° N. Regarding the two overflow branches, the influence of variations in the Denmark Strait overflow is, for all models, substantially larger than that of variations in the overflow across the Iceland–Scotland Ridge. The latter might, however, be underestimated, as the models in general do not realistically simulate the flow path of the Iceland–Scotland overflow water south of the Iceland–Scotland Ridge. The influence of variations in subpolar deep water formation is, on multimodel average, larger than that of variations in the Denmark Strait overflow. This is true both at 45° N, where the maximum standard deviation of decadal to multidecadal AMOC variability is located for all but one model, and at the more classical latitude of 30° N. At 30° N, variations in subpolar deep water formation and Denmark Strait overflow explain, on multimodel average, about half and one-third respectively of the decadal to multidecadal AMOC variance. Apart from analysing multimodel control simulations, we have performed sensitivity experiments with one of the models, in which we suppress the variability of either subpolar deep water formation or Nordic Seas overflows. The sensitivity experiments indicate that variations in subpolar deep water formation and Nordic Seas overflows are not completely independent. We further conclude from these experiments that the decadal to multidecadal AMOC variability north of about 50° N is mainly related to variations in Nordic Seas overflows. At 45° N and south of this ... Article in Journal/Newspaper Denmark Strait Iceland Nordic Seas Directory of Open Access Journals: DOAJ Articles Ocean Science 10 2 227 241 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
spellingShingle |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 K. Lohmann J. H. Jungclaus D. Matei J. Mignot M. Menary H. R. Langehaug J. Ba Y. Gao O. H. Otterå W. Park S. Lorenz The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation |
topic_facet |
Geography. Anthropology. Recreation G Environmental sciences GE1-350 |
description |
We investigate the respective role of variations in subpolar deep water formation and Nordic Seas overflows for the decadal to multidecadal variability of the Atlantic meridional overturning circulation (AMOC). This is partly done by analysing long (order of 1000 years) control simulations with five coupled climate models. For all models, the maximum influence of variations in subpolar deep water formation is found at about 45° N, while the maximum influence of variations in Nordic Seas overflows is rather found at 55 to 60° N. Regarding the two overflow branches, the influence of variations in the Denmark Strait overflow is, for all models, substantially larger than that of variations in the overflow across the Iceland–Scotland Ridge. The latter might, however, be underestimated, as the models in general do not realistically simulate the flow path of the Iceland–Scotland overflow water south of the Iceland–Scotland Ridge. The influence of variations in subpolar deep water formation is, on multimodel average, larger than that of variations in the Denmark Strait overflow. This is true both at 45° N, where the maximum standard deviation of decadal to multidecadal AMOC variability is located for all but one model, and at the more classical latitude of 30° N. At 30° N, variations in subpolar deep water formation and Denmark Strait overflow explain, on multimodel average, about half and one-third respectively of the decadal to multidecadal AMOC variance. Apart from analysing multimodel control simulations, we have performed sensitivity experiments with one of the models, in which we suppress the variability of either subpolar deep water formation or Nordic Seas overflows. The sensitivity experiments indicate that variations in subpolar deep water formation and Nordic Seas overflows are not completely independent. We further conclude from these experiments that the decadal to multidecadal AMOC variability north of about 50° N is mainly related to variations in Nordic Seas overflows. At 45° N and south of this ... |
format |
Article in Journal/Newspaper |
author |
K. Lohmann J. H. Jungclaus D. Matei J. Mignot M. Menary H. R. Langehaug J. Ba Y. Gao O. H. Otterå W. Park S. Lorenz |
author_facet |
K. Lohmann J. H. Jungclaus D. Matei J. Mignot M. Menary H. R. Langehaug J. Ba Y. Gao O. H. Otterå W. Park S. Lorenz |
author_sort |
K. Lohmann |
title |
The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation |
title_short |
The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation |
title_full |
The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation |
title_fullStr |
The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation |
title_full_unstemmed |
The role of subpolar deep water formation and Nordic Seas overflows in simulated multidecadal variability of the Atlantic meridional overturning circulation |
title_sort |
role of subpolar deep water formation and nordic seas overflows in simulated multidecadal variability of the atlantic meridional overturning circulation |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/os-10-227-2014 https://doaj.org/article/8b0248658ad4418ab72ed035faee4fd6 |
genre |
Denmark Strait Iceland Nordic Seas |
genre_facet |
Denmark Strait Iceland Nordic Seas |
op_source |
Ocean Science, Vol 10, Iss 2, Pp 227-241 (2014) |
op_relation |
http://www.ocean-sci.net/10/227/2014/os-10-227-2014.pdf https://doaj.org/toc/1812-0784 https://doaj.org/toc/1812-0792 1812-0784 1812-0792 doi:10.5194/os-10-227-2014 https://doaj.org/article/8b0248658ad4418ab72ed035faee4fd6 |
op_doi |
https://doi.org/10.5194/os-10-227-2014 |
container_title |
Ocean Science |
container_volume |
10 |
container_issue |
2 |
container_start_page |
227 |
op_container_end_page |
241 |
_version_ |
1766396627275218944 |