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Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM

Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM
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 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.
Diapycnal diffusion, Numerical mixing, z-Level models
1463-5003
27-36
Getzlaff, Julia
942892a6-174c-40c2-a0f2-9444966d8258
Nurser, George
2493ef9a-21e9-4d8b-9c32-08677e7e145a
Oschlies, Andreas
75e18f55-3134-44a2-82ba-71334397727f
Getzlaff, Julia
942892a6-174c-40c2-a0f2-9444966d8258
Nurser, George
2493ef9a-21e9-4d8b-9c32-08677e7e145a
Oschlies, Andreas
75e18f55-3134-44a2-82ba-71334397727f

Getzlaff, Julia, Nurser, George and Oschlies, Andreas (2012) Diagnostics of diapycnal diffusion in z-level ocean models. Part II: 3-Dimensional OGCM. Ocean Modelling, 45-46, 27-36. (doi:10.1016/j.ocemod.2011.11.006).

Record type: Article

Abstract

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.

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Published date: 2012
Keywords: Diapycnal diffusion, Numerical mixing, z-Level models
Organisations: Marine Systems Modelling

Identifiers

Local EPrints ID: 300220
URI: https://eprints.soton.ac.uk/id/eprint/300220
ISSN: 1463-5003
PURE UUID: 16c28bfb-697f-40de-a145-e8d7b2bb916c

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Date deposited: 20 Feb 2012 10:29
Last modified: 18 Jul 2017 06:15

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