Effects of different closures for thickness diffusivity
The effects of spatial variations of the thickness diffusivity (K) appropriate to the parameterisation of [Gent, P.R. and McWilliams, J.C., 1990. Isopycnal mixing in ocean circulation models. J. Phys. Oceanogr., 20, 150–155.] are assessed in a coarse resolution global ocean general circulation model...
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Online Access: | https://oceanrep.geomar.de/id/eprint/346/ https://oceanrep.geomar.de/id/eprint/346/3/Eden.pdf https://doi.org/10.1016/j.ocemod.2008.08.004 |
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ftoceanrep:oai:oceanrep.geomar.de:346 2024-09-30T14:26:35+00:00 Effects of different closures for thickness diffusivity Eden, Carsten Jochum, M. Danabasoglu, G. 2009 text https://oceanrep.geomar.de/id/eprint/346/ https://oceanrep.geomar.de/id/eprint/346/3/Eden.pdf https://doi.org/10.1016/j.ocemod.2008.08.004 en eng Elsevier https://oceanrep.geomar.de/id/eprint/346/3/Eden.pdf Eden, C., Jochum, M. and Danabasoglu, G. (2009) Effects of different closures for thickness diffusivity. Ocean Modelling, 26 (1-2). pp. 47-59. DOI 10.1016/j.ocemod.2008.08.004 <https://doi.org/10.1016/j.ocemod.2008.08.004>. doi:10.1016/j.ocemod.2008.08.004 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 2009 ftoceanrep https://doi.org/10.1016/j.ocemod.2008.08.004 2024-09-04T05:04:40Z The effects of spatial variations of the thickness diffusivity (K) appropriate to the parameterisation of [Gent, P.R. and McWilliams, J.C., 1990. Isopycnal mixing in ocean circulation models. J. Phys. Oceanogr., 20, 150–155.] are assessed in a coarse resolution global ocean general circulation model. Simulations using three closures yielding different lateral and/or vertical variations in K are compared with a simulation using a constant value. Although the effects of changing K are in general small and all simulations remain biased compared to observations, we find systematic local sensitivities of the simulated circulation on K. In particular, increasing K near the surface in the tropical ocean lifts the depth of the equatorial thermocline, the strength of the Antarctic Circumpolar Current decreases while the subpolar and subtropical gyre transports in the North Atlantic increase by increasing K locally. We also find that the lateral and vertical structure of K given by a recently proposed closure reduces the negative temperature biases in the western North Atlantic by adjusting the pathways of the Gulf Stream and the North Atlantic Current to a more realistic position. Article in Journal/Newspaper Antarc* Antarctic north atlantic current North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic The Antarctic Ocean Modelling 26 1-2 47 59 |
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Open Polar |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
The effects of spatial variations of the thickness diffusivity (K) appropriate to the parameterisation of [Gent, P.R. and McWilliams, J.C., 1990. Isopycnal mixing in ocean circulation models. J. Phys. Oceanogr., 20, 150–155.] are assessed in a coarse resolution global ocean general circulation model. Simulations using three closures yielding different lateral and/or vertical variations in K are compared with a simulation using a constant value. Although the effects of changing K are in general small and all simulations remain biased compared to observations, we find systematic local sensitivities of the simulated circulation on K. In particular, increasing K near the surface in the tropical ocean lifts the depth of the equatorial thermocline, the strength of the Antarctic Circumpolar Current decreases while the subpolar and subtropical gyre transports in the North Atlantic increase by increasing K locally. We also find that the lateral and vertical structure of K given by a recently proposed closure reduces the negative temperature biases in the western North Atlantic by adjusting the pathways of the Gulf Stream and the North Atlantic Current to a more realistic position. |
format |
Article in Journal/Newspaper |
author |
Eden, Carsten Jochum, M. Danabasoglu, G. |
spellingShingle |
Eden, Carsten Jochum, M. Danabasoglu, G. Effects of different closures for thickness diffusivity |
author_facet |
Eden, Carsten Jochum, M. Danabasoglu, G. |
author_sort |
Eden, Carsten |
title |
Effects of different closures for thickness diffusivity |
title_short |
Effects of different closures for thickness diffusivity |
title_full |
Effects of different closures for thickness diffusivity |
title_fullStr |
Effects of different closures for thickness diffusivity |
title_full_unstemmed |
Effects of different closures for thickness diffusivity |
title_sort |
effects of different closures for thickness diffusivity |
publisher |
Elsevier |
publishDate |
2009 |
url |
https://oceanrep.geomar.de/id/eprint/346/ https://oceanrep.geomar.de/id/eprint/346/3/Eden.pdf https://doi.org/10.1016/j.ocemod.2008.08.004 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic north atlantic current North Atlantic |
genre_facet |
Antarc* Antarctic north atlantic current North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/346/3/Eden.pdf Eden, C., Jochum, M. and Danabasoglu, G. (2009) Effects of different closures for thickness diffusivity. Ocean Modelling, 26 (1-2). pp. 47-59. DOI 10.1016/j.ocemod.2008.08.004 <https://doi.org/10.1016/j.ocemod.2008.08.004>. doi:10.1016/j.ocemod.2008.08.004 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.ocemod.2008.08.004 |
container_title |
Ocean Modelling |
container_volume |
26 |
container_issue |
1-2 |
container_start_page |
47 |
op_container_end_page |
59 |
_version_ |
1811646865295278080 |