Efficient upscaling of ocean biogeochemistry
Efficient upscaling of ocean biogeochemistry
More accurate methods are needed to represent biogeochemistry in ocean models with coarse spatial resolution, in order to assess the response of marine ecosystems to global change. We use eddy-resolving simulations to test methods of upscaling biogeochemistry from 1 km to the 100 km scale of global model grid cells. The neglect of subgrid-scale variability results in serious errors which are not robustly corrected by retuning parameters in the model dynamics. Moment closure schemes provide accurate upscaling for modest computational investment, with broadly similar results obtained by second moment and conditional moment closure schemes. However, the conditional scheme gives clear improvement when variability is imposed on maximum uptake rates under Michaelis–Menten nutrient limitation, as this may invalidate second-order expansions of the mean field dynamics.
Plankton, Spatial variability, Submesoscale parameterization, Conditional moment closure
40-55
Wallhead, Philip J.
ce3c3cd0-33fe-4aef-850a-e89b40e5edf6
Garçon, Véronique C.
9213bac8-1d50-408b-934e-44bae6fc8f1d
Martin, Adrian P.
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
2013
Wallhead, Philip J.
ce3c3cd0-33fe-4aef-850a-e89b40e5edf6
Garçon, Véronique C.
9213bac8-1d50-408b-934e-44bae6fc8f1d
Martin, Adrian P.
9d0d480d-9b3c-44c2-aafe-bb980ed98a6d
Wallhead, Philip J., Garçon, Véronique C. and Martin, Adrian P.
(2013)
Efficient upscaling of ocean biogeochemistry.
Ocean Modelling, 63, .
(doi:10.1016/j.ocemod.2012.12.002).
Abstract
More accurate methods are needed to represent biogeochemistry in ocean models with coarse spatial resolution, in order to assess the response of marine ecosystems to global change. We use eddy-resolving simulations to test methods of upscaling biogeochemistry from 1 km to the 100 km scale of global model grid cells. The neglect of subgrid-scale variability results in serious errors which are not robustly corrected by retuning parameters in the model dynamics. Moment closure schemes provide accurate upscaling for modest computational investment, with broadly similar results obtained by second moment and conditional moment closure schemes. However, the conditional scheme gives clear improvement when variability is imposed on maximum uptake rates under Michaelis–Menten nutrient limitation, as this may invalidate second-order expansions of the mean field dynamics.
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Published date: 2013
Keywords:
Plankton, Spatial variability, Submesoscale parameterization, Conditional moment closure
Organisations:
Marine Biogeochemistry
Identifiers
Local EPrints ID: 349121
URI: http://eprints.soton.ac.uk/id/eprint/349121
ISSN: 1463-5003
PURE UUID: a063e5af-ef0e-4a2d-b899-2c3fbbc573ff
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Date deposited: 25 Feb 2013 13:16
Last modified: 14 Mar 2024 13:09
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Contributors
Author:
Philip J. Wallhead
Author:
Véronique C. Garçon
Author:
Adrian P. Martin
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