Response of a strongly eddying global ocean to North Atlantic freshwater perturbations
The strongly eddying version of the Parallel Ocean Program (POP) is used in two 45-yr simulations to investigate the response of the Atlantic meridional overturning circulation (AMOC) to strongly enhanced freshwater input due to Greenland melting, with an integrated flux of 0.5 Sverdrups (Sv; 1 Sv ≡...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/349359 2023-07-23T04:19:36+02:00 Response of a strongly eddying global ocean to North Atlantic freshwater perturbations Den Toom, Matthijs Dijkstra, Henk A. Weijer, Wilbert Hecht, Matthew W. Maltrud, Mathew E. Van Sebille, Erik Sub Physical Oceanography Dep Natuurkunde Marine and Atmospheric Research 2014-02 image/pdf https://dspace.library.uu.nl/handle/1874/349359 en eng 0022-3670 https://dspace.library.uu.nl/handle/1874/349359 info:eu-repo/semantics/OpenAccess Oceanography Article 2014 ftunivutrecht 2023-07-02T02:05:58Z The strongly eddying version of the Parallel Ocean Program (POP) is used in two 45-yr simulations to investigate the response of the Atlantic meridional overturning circulation (AMOC) to strongly enhanced freshwater input due to Greenland melting, with an integrated flux of 0.5 Sverdrups (Sv; 1 Sv ≡ 106m3 s-1). For comparison, a similar set of experiments is performed using a noneddying version of POP. The aim is to identify the signature of the salt advection feedback in the two configurations. For this reason, surface salinity is not restored in these experiments. The freshwater input leads to a quantitatively comparable reduction of the overturning strength in the two models. To examine the importance of transient effects in the relation betweenAMOCstrength and density distribution, the results of the eddy-resolving model are related to water mass transformation theory. The freshwater forcing leads to a reduction of the rate of light to dense water conversion in the North Atlantic, but there is no change in dense to light transformation elsewhere, implying that high density layers are continuously deflating. The main focus of the paper is on the effect of the AMOC reduction on the basinwide advection of freshwater. The low-resolution model results show a change of the net freshwater advection that is consistent with the salt advection feedback. However, for the eddy-resolving model, the net freshwater advection into the Atlantic basin appears to be unaffected, despite the significant change in the large-scale velocity structure. Article in Journal/Newspaper Greenland North Atlantic Utrecht University Repository Greenland |
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Open Polar |
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Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Oceanography |
spellingShingle |
Oceanography Den Toom, Matthijs Dijkstra, Henk A. Weijer, Wilbert Hecht, Matthew W. Maltrud, Mathew E. Van Sebille, Erik Response of a strongly eddying global ocean to North Atlantic freshwater perturbations |
topic_facet |
Oceanography |
description |
The strongly eddying version of the Parallel Ocean Program (POP) is used in two 45-yr simulations to investigate the response of the Atlantic meridional overturning circulation (AMOC) to strongly enhanced freshwater input due to Greenland melting, with an integrated flux of 0.5 Sverdrups (Sv; 1 Sv ≡ 106m3 s-1). For comparison, a similar set of experiments is performed using a noneddying version of POP. The aim is to identify the signature of the salt advection feedback in the two configurations. For this reason, surface salinity is not restored in these experiments. The freshwater input leads to a quantitatively comparable reduction of the overturning strength in the two models. To examine the importance of transient effects in the relation betweenAMOCstrength and density distribution, the results of the eddy-resolving model are related to water mass transformation theory. The freshwater forcing leads to a reduction of the rate of light to dense water conversion in the North Atlantic, but there is no change in dense to light transformation elsewhere, implying that high density layers are continuously deflating. The main focus of the paper is on the effect of the AMOC reduction on the basinwide advection of freshwater. The low-resolution model results show a change of the net freshwater advection that is consistent with the salt advection feedback. However, for the eddy-resolving model, the net freshwater advection into the Atlantic basin appears to be unaffected, despite the significant change in the large-scale velocity structure. |
author2 |
Sub Physical Oceanography Dep Natuurkunde Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Den Toom, Matthijs Dijkstra, Henk A. Weijer, Wilbert Hecht, Matthew W. Maltrud, Mathew E. Van Sebille, Erik |
author_facet |
Den Toom, Matthijs Dijkstra, Henk A. Weijer, Wilbert Hecht, Matthew W. Maltrud, Mathew E. Van Sebille, Erik |
author_sort |
Den Toom, Matthijs |
title |
Response of a strongly eddying global ocean to North Atlantic freshwater perturbations |
title_short |
Response of a strongly eddying global ocean to North Atlantic freshwater perturbations |
title_full |
Response of a strongly eddying global ocean to North Atlantic freshwater perturbations |
title_fullStr |
Response of a strongly eddying global ocean to North Atlantic freshwater perturbations |
title_full_unstemmed |
Response of a strongly eddying global ocean to North Atlantic freshwater perturbations |
title_sort |
response of a strongly eddying global ocean to north atlantic freshwater perturbations |
publishDate |
2014 |
url |
https://dspace.library.uu.nl/handle/1874/349359 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_relation |
0022-3670 https://dspace.library.uu.nl/handle/1874/349359 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772182838223831040 |