Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM
We present a robust method for diagnosing total diapycnal diffusivities, i.e. explicitly applied plus numerically induced diffusivities, from tracer release experiments in numerical z-level models. To this extent, numerical experiments differing only in the advection scheme used (CTRD using 2nd orde...
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ftnerc:oai:nora.nerc.ac.uk:400220 2023-05-15T17:32:46+02:00 Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM Getzlaff, Julia Nurser, George Oschlies, Andreas 2012 http://nora.nerc.ac.uk/id/eprint/400220/ unknown Getzlaff, Julia; Nurser, George; Oschlies, Andreas. 2012 Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM. Ocean Modelling, 45-46. 27-36. https://doi.org/10.1016/j.ocemod.2011.11.006 <https://doi.org/10.1016/j.ocemod.2011.11.006> Publication - Article PeerReviewed 2012 ftnerc https://doi.org/10.1016/j.ocemod.2011.11.006 2023-02-04T19:36:01Z We present a robust method for diagnosing total diapycnal diffusivities, i.e. explicitly applied plus numerically induced diffusivities, from tracer release experiments in numerical z-level models. To this extent, numerical experiments differing only in the advection scheme used (CTRD using 2nd order centred differences, UPWIND using the upwind/upstream advection scheme, QUICK using the quicker advection scheme after Farrow and Stevens (1995) and FCT after Gerdes et al. (1991)) are analysed and compared. To obtain regionally resolved estimates of diapycnal diffusivities, individual inert dye tracers are released in dynamically different regions of a North Atlantic model, namely (i) in the interior of the subtropical gyre and (ii) in the western boundary current. Diagnosed diffusivities are robust with respect to changes in temporal and spatial sampling of the simulated dye tracer for both advection schemes and for both regions. The numerically induced diffusivity is generally positive, but can become negative for centred differences advection numerics after several months of simulated tracer dispersion. Article in Journal/Newspaper North Atlantic Natural Environment Research Council: NERC Open Research Archive Ocean Modelling 45-46 27 36 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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unknown |
description |
We present a robust method for diagnosing total diapycnal diffusivities, i.e. explicitly applied plus numerically induced diffusivities, from tracer release experiments in numerical z-level models. To this extent, numerical experiments differing only in the advection scheme used (CTRD using 2nd order centred differences, UPWIND using the upwind/upstream advection scheme, QUICK using the quicker advection scheme after Farrow and Stevens (1995) and FCT after Gerdes et al. (1991)) are analysed and compared. To obtain regionally resolved estimates of diapycnal diffusivities, individual inert dye tracers are released in dynamically different regions of a North Atlantic model, namely (i) in the interior of the subtropical gyre and (ii) in the western boundary current. Diagnosed diffusivities are robust with respect to changes in temporal and spatial sampling of the simulated dye tracer for both advection schemes and for both regions. The numerically induced diffusivity is generally positive, but can become negative for centred differences advection numerics after several months of simulated tracer dispersion. |
format |
Article in Journal/Newspaper |
author |
Getzlaff, Julia Nurser, George Oschlies, Andreas |
spellingShingle |
Getzlaff, Julia Nurser, George Oschlies, Andreas Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM |
author_facet |
Getzlaff, Julia Nurser, George Oschlies, Andreas |
author_sort |
Getzlaff, Julia |
title |
Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM |
title_short |
Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM |
title_full |
Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM |
title_fullStr |
Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM |
title_full_unstemmed |
Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM |
title_sort |
diagnostics of diapycnal diffusion in z-level ocean models. part ii: 3-dimensional ogcm |
publishDate |
2012 |
url |
http://nora.nerc.ac.uk/id/eprint/400220/ |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Getzlaff, Julia; Nurser, George; Oschlies, Andreas. 2012 Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM. Ocean Modelling, 45-46. 27-36. https://doi.org/10.1016/j.ocemod.2011.11.006 <https://doi.org/10.1016/j.ocemod.2011.11.006> |
op_doi |
https://doi.org/10.1016/j.ocemod.2011.11.006 |
container_title |
Ocean Modelling |
container_volume |
45-46 |
container_start_page |
27 |
op_container_end_page |
36 |
_version_ |
1766131044981932032 |