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An Isopycnal Box Model with predictive deep-ocean structure for biogeochemical cycling applications

An Isopycnal Box Model with predictive deep-ocean structure for biogeochemical cycling applications
An Isopycnal Box Model with predictive deep-ocean structure for biogeochemical cycling applications
To simulate global ocean biogeochemical tracer budgets a model must accurately determine both the volume and surface origins of each water-mass. Water-mass volumes are dynamically linked to the ocean circulation in General Circulation Models, but at the cost of high computational load. In computationally efficient Box Models the water-mass volumes are simply prescribed and do not vary when the circulation transport rates or water mass densities are perturbed. A new computationally efficient Isopycnal Box Model is presented in which the sub-surface box volumes are internally calculated from the prescribed circulation using a diffusive conceptual model of the thermocline, in which upwelling of cold dense water is balanced by a downward diffusion of heat. The volumes of the sub-surface boxes are set so that the density stratification satisfies an assumed link between diapycnal diffusivity, ?d, and buoyancy frequency, N: ?d = c/(N?), where c and ? are user prescribed parameters. In contrast to conventional Box Models, the volumes of the sub-surface ocean boxes in the Isopycnal Box Model are dynamically linked to circulation, and automatically respond to circulation perturbations. This dynamical link allows an important facet of ocean biogeochemical cycling to be simulated in a highly computationally efficient model framework.
box model, pycnocline, density stratification, water bodies, biogeochemical cycle
1463-5003
19-36
Goodwin, Philip
87dbb154-5c39-473a-8121-c794487ee1fd
Goodwin, Philip
87dbb154-5c39-473a-8121-c794487ee1fd

Goodwin, Philip (2012) An Isopycnal Box Model with predictive deep-ocean structure for biogeochemical cycling applications. Ocean Modelling, 51, 19-36. (doi:10.1016/j.ocemod.2012.04.005).

Record type: Article

Abstract

To simulate global ocean biogeochemical tracer budgets a model must accurately determine both the volume and surface origins of each water-mass. Water-mass volumes are dynamically linked to the ocean circulation in General Circulation Models, but at the cost of high computational load. In computationally efficient Box Models the water-mass volumes are simply prescribed and do not vary when the circulation transport rates or water mass densities are perturbed. A new computationally efficient Isopycnal Box Model is presented in which the sub-surface box volumes are internally calculated from the prescribed circulation using a diffusive conceptual model of the thermocline, in which upwelling of cold dense water is balanced by a downward diffusion of heat. The volumes of the sub-surface boxes are set so that the density stratification satisfies an assumed link between diapycnal diffusivity, ?d, and buoyancy frequency, N: ?d = c/(N?), where c and ? are user prescribed parameters. In contrast to conventional Box Models, the volumes of the sub-surface ocean boxes in the Isopycnal Box Model are dynamically linked to circulation, and automatically respond to circulation perturbations. This dynamical link allows an important facet of ocean biogeochemical cycling to be simulated in a highly computationally efficient model framework.

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More information

Published date: July 2012
Keywords: box model, pycnocline, density stratification, water bodies, biogeochemical cycle
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 350504
URI: http://eprints.soton.ac.uk/id/eprint/350504
ISSN: 1463-5003
PURE UUID: 8afe0f4d-f28a-4977-a015-751714db2222
ORCID for Philip Goodwin: ORCID iD orcid.org/0000-0002-2575-8948

Catalogue record

Date deposited: 26 Mar 2013 09:57
Last modified: 28 Apr 2022 02:09

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