Calibration of a simple and a complex model of global marine biogeochemistry.

Kriest, Iris (2017) Calibration of a simple and a complex model of global marine biogeochemistry. Open Access Biogeosciences (BG), 14 . pp. 4965-4984. DOI 10.5194/bg-14-4965-2017.

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Abstract

The assessment of the ocean biota's role in climate climate change is often carried out with global biogeochemical ocean models that contain many components, and involve a high level of parametric uncertainty. Examination the models' fit to climatologies of inorganic tracers, after the models have been spun up to steady state, is a common, but computationally expensive procedure to assess model performance and reliability. Using new tools that have become available for global model assessment and calibration in steady state, this paper examines two different model types – a complex seven-component model (MOPS), and a very simple two-component model (RetroMOPS) – for their fit to dissolved quantities. Before comparing the models, a subset of their biogeochemical parameters has been optimised against annual mean nutrients and oxygen. Both model types fit the observations almost equally well. The simple model, which contains only nutrients and dissolved organic phosphorus (DOP), is sensitive to the parameterisation of DOP production and decay. The spatio-temporal decoupling of nitrogen and oxygen, and processes involved in their uptake and release, renders oxygen and nitrate valuable tracers for model calibration. In addition, the non-conservative nature of these tracers (with respect to their upper boundary condition) introduces the global bias as a useful additional constraint on model parameters. Dissolved organic phosphorous at the surface behaves antagonistically to phosphate, and suggests that observations of this tracer – although difficult to measure – may be an important asset for model calibration

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754
OceanRep > SFB 754 > B1
OceanRep > SFB 754 > B8
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.5194/bg-14-4965-2017
ISSN: 1726-4170
Related URLs:
Projects: SFB754, PalMod
Date Deposited: 06 Mar 2017 08:03
Last Modified: 08 Jan 2018 10:43
URI: http://oceanrep.geomar.de/id/eprint/36804

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