Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

FP5

ORFOIS Sintesi della relazione

Project ID: EVK2-CT-2001-00100
Finanziato nell'ambito di: FP5-EESD
Paese: Netherlands

1-D model system with particle dynamics, ecology, dynamics, geochemistry, water column, sediment

Quantifying mass exchanges within the marine environment is essential for understanding its role in the global carbon budget and how it will respond to perturbations in climate. Mathematical models are most frequently used for this quantification and prediction.

However, as modelling of aquatic systems is not an exact science, ecologists have been struggling for decades to improve their models and to find the most appropriate balance between model complexity, ease of calibration, and precision. On the one hand, complex models may better represent the data, whilst on the other hand, they are more difficult to understand, and prediction uncertainty may increase with model complexity.

To facilitate the selection of the complexity of models, a modelling framework has been implemented during the course of the ORFOIS project. This framework allows creating 1-D water-column and sediment models with varying complexity, from simple NPZD models to more complex models that combine unbalanced formulations for (several groups of) algae, DOM and POM with balanced formulations for (several groups of) zooplankton.

Two manuals were written and disseminated with the source code, model executables and model output, which were put on the ORFOIS CD. The first manual (Soetaert and Greenwood, a) describes how to create 1-D models within the framework, the second manual (Soetaert and Greenwood, b) describes the various components that are incorporated in the framework. Several applications of the 1-D model framework were run, demonstrating the impact of model complexity on model outcome. The output of these runs was also put on the ORFOIS CD, together with software that can be used to visualize this output. The visualization software and the model executables run on a pc.

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NIOO-CEME
POB 140
4400 AC Yerseke
Netherlands
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