Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt
When driven under ''mixed boundary conditions'', coarse resolution ocean general circulation models (OGCMs) generally show a high sensitivity of the present-day thermohaline circulation against perturbations. We will show that an alternative formulation of the boundary condition...
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1994
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ftpubman:oai:pure.mpg.de:item_2619835 2023-08-20T04:08:08+02:00 Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt Mikolajewlcz, U. Maier-Reimer, E. 1994 application/pdf http://hdl.handle.net/21.11116/0000-0001-B2C3-9 http://hdl.handle.net/21.11116/0000-0001-B2C5-7 http://hdl.handle.net/21.11116/0000-0001-B2C6-6 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/94JC01989 http://hdl.handle.net/21.11116/0000-0001-B2C3-9 http://hdl.handle.net/21.11116/0000-0001-B2C5-7 http://hdl.handle.net/21.11116/0000-0001-B2C6-6 info:eu-repo/semantics/openAccess Journal of Geophysical Research: Oceans Report / Max-Planck-Institut für Meteorologie info:eu-repo/semantics/article 1994 ftpubman https://doi.org/10.1029/94JC01989 2023-08-01T23:20:55Z When driven under ''mixed boundary conditions'', coarse resolution ocean general circulation models (OGCMs) generally show a high sensitivity of the present-day thermohaline circulation against perturbations. We will show that an alternative formulation of the boundary condition for temperature, a mixture of prescribed heat fluxes and additional restoring of the sea surface temperature to a climatological boundary temperature with a longer time constant, drastically alters the stability of the modes of the thermohaline circulation. The results from simulations with the Hamburg large-scale geostrophic OGCM indicate that the stability of the mode of the thermohaline circulation with formation of North Atlantic deepwater increases, if the damping of sea surface temperature anomalies is reduced, whereas the opposite is true for the mode without North Atlantic deep water formation. It turns out that the formulation of the temperature boundary condition also affects the variability of the model. Article in Journal/Newspaper North Atlantic Deep Water North Atlantic Max Planck Society: MPG.PuRe Journal of Geophysical Research 99 C11 22633 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
When driven under ''mixed boundary conditions'', coarse resolution ocean general circulation models (OGCMs) generally show a high sensitivity of the present-day thermohaline circulation against perturbations. We will show that an alternative formulation of the boundary condition for temperature, a mixture of prescribed heat fluxes and additional restoring of the sea surface temperature to a climatological boundary temperature with a longer time constant, drastically alters the stability of the modes of the thermohaline circulation. The results from simulations with the Hamburg large-scale geostrophic OGCM indicate that the stability of the mode of the thermohaline circulation with formation of North Atlantic deepwater increases, if the damping of sea surface temperature anomalies is reduced, whereas the opposite is true for the mode without North Atlantic deep water formation. It turns out that the formulation of the temperature boundary condition also affects the variability of the model. |
format |
Article in Journal/Newspaper |
author |
Mikolajewlcz, U. Maier-Reimer, E. |
spellingShingle |
Mikolajewlcz, U. Maier-Reimer, E. Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt |
author_facet |
Mikolajewlcz, U. Maier-Reimer, E. |
author_sort |
Mikolajewlcz, U. |
title |
Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt |
title_short |
Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt |
title_full |
Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt |
title_fullStr |
Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt |
title_full_unstemmed |
Mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt |
title_sort |
mixed boundary conditions in ocean general circulation models and their influence on the stability of the model's conveyor belt |
publishDate |
1994 |
url |
http://hdl.handle.net/21.11116/0000-0001-B2C3-9 http://hdl.handle.net/21.11116/0000-0001-B2C5-7 http://hdl.handle.net/21.11116/0000-0001-B2C6-6 |
genre |
North Atlantic Deep Water North Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic |
op_source |
Journal of Geophysical Research: Oceans Report / Max-Planck-Institut für Meteorologie |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/94JC01989 http://hdl.handle.net/21.11116/0000-0001-B2C3-9 http://hdl.handle.net/21.11116/0000-0001-B2C5-7 http://hdl.handle.net/21.11116/0000-0001-B2C6-6 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/94JC01989 |
container_title |
Journal of Geophysical Research |
container_volume |
99 |
container_issue |
C11 |
container_start_page |
22633 |
_version_ |
1774720229734088704 |