Reducing the model-data misfit in a marine ecosystem model using periodic parameters and linear quadratic optimal control.

El Jarbi, Mustapha, Rückelt, Johannes, Slawig, Thomas and Oschlies, Andreas (2013) Reducing the model-data misfit in a marine ecosystem model using periodic parameters and linear quadratic optimal control. Open Access Biogeosciences (BG), 10 (2). pp. 1169-1182. DOI 10.5194/bg-10-1169-2013.

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Abstract

This paper presents the application of the Linear Quadratic Optimal Control (LQOC) method to a parameter optimization problem for a one-dimensional marine ecosystem model of NPZD (N for dissolved inorganic nitrogen, P for phytoplankton, Z for zooplankton and D for detritus) type. This ecosystem model, developed by Oschlies and Garcon, simulates the distribution of nitrogen, phytoplankton, zooplankton and detritus in a water column and is driven by ocean circulation data. The LQOC method is used to introduce annually periodic model parameters in a linearized version of the model. We show that the obtained version of the model gives a significant reduction of the model-data misfit, compared to the one obtained for the original model with optimized constant parameters. The found inner-annual variability of the optimized parameters provides hints for improvement of the original model. We use the obtained optimal periodic parameters also in validation and prediction experiments with the original non-linear version of the model. In both cases, the results are significantly better than those obtained with optimized constant parameters.

Document Type: Article
Additional Information: WOS:000317010000002
Keywords: DATA-BASED OPTIMIZATION; NORTH-ATLANTIC; 1D-ECOSYSTEM MODEL; TIME-SERIES; 3 LOCATIONS; ASSIMILATION; SENSITIVITY; STATION; OCEAN
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
Kiel University
Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence > FO-R11
OceanRep > The Future Ocean - Cluster of Excellence > FO-R04
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-10-1169-2013
ISSN: 1726-4170
Projects: Future Ocean
Date Deposited: 11 Mar 2013 10:01
Last Modified: 21 Mar 2017 11:30
URI: http://oceanrep.geomar.de/id/eprint/20687

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