Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution
While forced ocean hindcast simulations are useful for a wide range of applications, a key limitation is their inability to simulate ocean-atmosphere feedbacks. As a consequence, they need to rely on artificial choices such as sea surface salinity restoring and other corrections affecting the surfac...
Published in: | Journal of Advances in Modeling Earth Systems |
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Language: | English |
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AGU (American Geophysical Union)
2022
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Online Access: | https://oceanrep.geomar.de/id/eprint/57471/ https://oceanrep.geomar.de/id/eprint/57471/13/J%20Adv%20Model%20Earth%20Syst%20-%202022%20Schulzki.pdf https://oceanrep.geomar.de/id/eprint/57471/2/2022ms003200-sup-0001-supporting%20information%20si-s01.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022MS003200 https://doi.org/10.1029/2022MS003200 |
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ftoceanrep:oai:oceanrep.geomar.de:57471 2024-02-11T10:06:34+01:00 Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution Schulzki, Tobias Harlaß, Jan Schwarzkopf, Franziska U. Biastoch, Arne 2022-12-04 text https://oceanrep.geomar.de/id/eprint/57471/ https://oceanrep.geomar.de/id/eprint/57471/13/J%20Adv%20Model%20Earth%20Syst%20-%202022%20Schulzki.pdf https://oceanrep.geomar.de/id/eprint/57471/2/2022ms003200-sup-0001-supporting%20information%20si-s01.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022MS003200 https://doi.org/10.1029/2022MS003200 en eng AGU (American Geophysical Union) Wiley https://oceanrep.geomar.de/id/eprint/57471/13/J%20Adv%20Model%20Earth%20Syst%20-%202022%20Schulzki.pdf https://oceanrep.geomar.de/id/eprint/57471/2/2022ms003200-sup-0001-supporting%20information%20si-s01.pdf Schulzki, T. , Harlaß, J. , Schwarzkopf, F. U. and Biastoch, A. (2022) Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution. Open Access Journal of Advances in Modeling Earth Systems, 14 (12). Art.Nr. e2022MS003200. DOI 10.1029/2022MS003200 <https://doi.org/10.1029/2022MS003200>. doi:10.1029/2022MS003200 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed info:eu-repo/semantics/article 2022 ftoceanrep https://doi.org/10.1029/2022MS003200 2024-01-15T00:26:28Z While forced ocean hindcast simulations are useful for a wide range of applications, a key limitation is their inability to simulate ocean-atmosphere feedbacks. As a consequence, they need to rely on artificial choices such as sea surface salinity restoring and other corrections affecting the surface freshwater fluxes. Fully coupled models overcome these limitations, but lack the correct timing of variability due to weaker observational constraints. This leads to a mismatch between forced and coupled models on interannual to decadal timescales. A possibility to combine the advantages of both modelling strategies is to apply a partial coupling (PCPL), i.e. replacing the surface winds stress in the ocean component by wind stress derived from reanalysis. To identify the capabilities, limitations and possible use cases of partial coupling, we perform a fully coupled, two partially coupled and an ocean-only experiment using an all-Atlantic nested ocean configuration at eddying resolution in a global climate model. We show that the correct timing of Atlantic Meridional Overturning Circulation (AMOC) variability in PCPL experiments is robust on timescales below 5 years. Mid-latitude wind stress curl changes contribute to decadal AMOC variability, but North Atlantic buoyancy fluxes are not significantly altered by incorporating reanalysed wind stress anomalies, limiting the success of PCPL on this timescale. Long term trends of the AMOC in PCPL mode are consistent with fully coupled model experiments under historic atmospheric boundary conditions, suggesting that a partially coupled model is still able to simulate the important ocean-atmosphere feedbacks necessary to maintain a stable AMOC. Article in Journal/Newspaper North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Curl ENVELOPE(-63.071,-63.071,-70.797,-70.797) Journal of Advances in Modeling Earth Systems 14 12 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
While forced ocean hindcast simulations are useful for a wide range of applications, a key limitation is their inability to simulate ocean-atmosphere feedbacks. As a consequence, they need to rely on artificial choices such as sea surface salinity restoring and other corrections affecting the surface freshwater fluxes. Fully coupled models overcome these limitations, but lack the correct timing of variability due to weaker observational constraints. This leads to a mismatch between forced and coupled models on interannual to decadal timescales. A possibility to combine the advantages of both modelling strategies is to apply a partial coupling (PCPL), i.e. replacing the surface winds stress in the ocean component by wind stress derived from reanalysis. To identify the capabilities, limitations and possible use cases of partial coupling, we perform a fully coupled, two partially coupled and an ocean-only experiment using an all-Atlantic nested ocean configuration at eddying resolution in a global climate model. We show that the correct timing of Atlantic Meridional Overturning Circulation (AMOC) variability in PCPL experiments is robust on timescales below 5 years. Mid-latitude wind stress curl changes contribute to decadal AMOC variability, but North Atlantic buoyancy fluxes are not significantly altered by incorporating reanalysed wind stress anomalies, limiting the success of PCPL on this timescale. Long term trends of the AMOC in PCPL mode are consistent with fully coupled model experiments under historic atmospheric boundary conditions, suggesting that a partially coupled model is still able to simulate the important ocean-atmosphere feedbacks necessary to maintain a stable AMOC. |
format |
Article in Journal/Newspaper |
author |
Schulzki, Tobias Harlaß, Jan Schwarzkopf, Franziska U. Biastoch, Arne |
spellingShingle |
Schulzki, Tobias Harlaß, Jan Schwarzkopf, Franziska U. Biastoch, Arne Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution |
author_facet |
Schulzki, Tobias Harlaß, Jan Schwarzkopf, Franziska U. Biastoch, Arne |
author_sort |
Schulzki, Tobias |
title |
Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution |
title_short |
Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution |
title_full |
Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution |
title_fullStr |
Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution |
title_full_unstemmed |
Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution |
title_sort |
toward ocean hindcasts in earth system models: amoc variability in a partially coupled model at eddying resolution |
publisher |
AGU (American Geophysical Union) |
publishDate |
2022 |
url |
https://oceanrep.geomar.de/id/eprint/57471/ https://oceanrep.geomar.de/id/eprint/57471/13/J%20Adv%20Model%20Earth%20Syst%20-%202022%20Schulzki.pdf https://oceanrep.geomar.de/id/eprint/57471/2/2022ms003200-sup-0001-supporting%20information%20si-s01.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022MS003200 https://doi.org/10.1029/2022MS003200 |
long_lat |
ENVELOPE(-63.071,-63.071,-70.797,-70.797) |
geographic |
Curl |
geographic_facet |
Curl |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/57471/13/J%20Adv%20Model%20Earth%20Syst%20-%202022%20Schulzki.pdf https://oceanrep.geomar.de/id/eprint/57471/2/2022ms003200-sup-0001-supporting%20information%20si-s01.pdf Schulzki, T. , Harlaß, J. , Schwarzkopf, F. U. and Biastoch, A. (2022) Toward ocean hindcasts in earth system models: AMOC variability in a partially coupled model at eddying resolution. Open Access Journal of Advances in Modeling Earth Systems, 14 (12). Art.Nr. e2022MS003200. DOI 10.1029/2022MS003200 <https://doi.org/10.1029/2022MS003200>. doi:10.1029/2022MS003200 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2022MS003200 |
container_title |
Journal of Advances in Modeling Earth Systems |
container_volume |
14 |
container_issue |
12 |
_version_ |
1790604365697908736 |