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 ≡...
Published in: | Journal of Physical Oceanography |
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ftosti:oai:osti.gov:1565242 2023-07-30T04:03:54+02:00 Response of a Strongly Eddying Global Ocean to North Atlantic Freshwater Perturbations Toom, Matthijs den Dijkstra, Henk A. Weijer, Wilbert Hecht, Matthew W. Maltrud, Mathew E. van Sebille, Erik 2023-06-30 application/pdf http://www.osti.gov/servlets/purl/1565242 https://www.osti.gov/biblio/1565242 https://doi.org/10.1175/jpo-d-12-0155.1 unknown http://www.osti.gov/servlets/purl/1565242 https://www.osti.gov/biblio/1565242 https://doi.org/10.1175/jpo-d-12-0155.1 doi:10.1175/jpo-d-12-0155.1 54 ENVIRONMENTAL SCIENCES 2023 ftosti https://doi.org/10.1175/jpo-d-12-0155.1 2023-07-11T09:37:06Z 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 ≡ 10 6 m 3 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 between AMOC strength 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. Other/Unknown Material Greenland North Atlantic SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) Greenland Journal of Physical Oceanography 44 2 464 481 |
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SciTec Connect (Office of Scientific and Technical Information - OSTI, U.S. Department of Energy) |
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ftosti |
language |
unknown |
topic |
54 ENVIRONMENTAL SCIENCES |
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54 ENVIRONMENTAL SCIENCES Toom, Matthijs den 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 |
54 ENVIRONMENTAL SCIENCES |
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 ≡ 10 6 m 3 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 between AMOC strength 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. |
author |
Toom, Matthijs den Dijkstra, Henk A. Weijer, Wilbert Hecht, Matthew W. Maltrud, Mathew E. van Sebille, Erik |
author_facet |
Toom, Matthijs den Dijkstra, Henk A. Weijer, Wilbert Hecht, Matthew W. Maltrud, Mathew E. van Sebille, Erik |
author_sort |
Toom, Matthijs den |
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 |
2023 |
url |
http://www.osti.gov/servlets/purl/1565242 https://www.osti.gov/biblio/1565242 https://doi.org/10.1175/jpo-d-12-0155.1 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland North Atlantic |
genre_facet |
Greenland North Atlantic |
op_relation |
http://www.osti.gov/servlets/purl/1565242 https://www.osti.gov/biblio/1565242 https://doi.org/10.1175/jpo-d-12-0155.1 doi:10.1175/jpo-d-12-0155.1 |
op_doi |
https://doi.org/10.1175/jpo-d-12-0155.1 |
container_title |
Journal of Physical Oceanography |
container_volume |
44 |
container_issue |
2 |
container_start_page |
464 |
op_container_end_page |
481 |
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1772815034466959360 |