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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ftpubman:oai:pure.mpg.de:item_1920672 2023-08-20T04:02:18+02:00 Effects of different closures for thickness diffusivity Eden, C. Jochum, M. Danabasoglu, G. 2009 http://hdl.handle.net/11858/00-001M-0000-0017-CC5C-D eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ocemod.2008.08.004 http://hdl.handle.net/11858/00-001M-0000-0017-CC5C-D OCEAN MODELLING info:eu-repo/semantics/article 2009 ftpubman https://doi.org/10.1016/j.ocemod.2008.08.004 2023-08-01T22:38:08Z 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. (c) 2008 Elsevier Ltd. All rights reserved. Article in Journal/Newspaper Antarc* Antarctic north atlantic current North Atlantic Max Planck Society: MPG.PuRe Antarctic The Antarctic Ocean Modelling 26 1-2 47 59 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
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. (c) 2008 Elsevier Ltd. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Eden, C. Jochum, M. Danabasoglu, G. |
spellingShingle |
Eden, C. Jochum, M. Danabasoglu, G. Effects of different closures for thickness diffusivity |
author_facet |
Eden, C. Jochum, M. Danabasoglu, G. |
author_sort |
Eden, C. |
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 |
publishDate |
2009 |
url |
http://hdl.handle.net/11858/00-001M-0000-0017-CC5C-D |
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_source |
OCEAN MODELLING |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ocemod.2008.08.004 http://hdl.handle.net/11858/00-001M-0000-0017-CC5C-D |
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_ |
1774712719757279232 |