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Modelling of the seasonal patterns of dimethylsulphide production and fate during 1989 at a site in the North Sea

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Abstract:

This modelling study aimed to extend our understanding of the biogeochemistry of the climatically active gas dimethylsulphide (DMS) in marine surface waters to an annual cycle. Processes involved in the production and fate of DMS and its precursor -dimethylsulphoniopropionate (DMSP), a product of phytoplankton synthesis, were incorporated into a complex, coupled one-dimensional physical ecosystem model (European Regional Seas Ecosystem Model (ERSEM) and the General Ocean Turbulence Model (GOTM)) to create a model of DMS biogeochemistry at a seasonally stratified site in the North Sea for 1989. The model was validated against nutrient concentrations, biological standing stocks, biological production, DMS and DMSP concentrations, and DMS sea to air flux determined throughout 1989 during the North Sea Project. The validation results demonstrated that complex ecosystem models, combined with a comprehensive network of processes that control the production and fate of DMSP and DMS, could accurately mimic DMS biogeochemistry. The model provides insights into the impact of seasonally changing physical forcing on the relative contribution of individual processes to DMS production and sea to air flux.

Notre étude de modélisation vise à placer dans un cycle annuel nos connaissances de la biogéochimie du sulfure de diméthyle (DMS), un gaz qui affecte le climat, dans les eaux marines superficielles. Nous avons incorporé les processus impliqués dans la production et le sort du DMS et de son précurseur le -diméthylsulfoniopropionate (DMSP), un produit de synthèse du phytoplancton, dans le modèle ERSEM (« European Regional Seas Ecosystem Model »), un modèle physique, complexe, unidimensionel et couplé de l'écosystème et dans le modèle GOTM (« General Ocean Turbulence Model »). Nous avons ainsi mis au point un modèle de la biogéochimie du DMS appliqué à des données de 1989 provenant d'un site à stratification saisonnière de la mer du Nord. Nous l'avons validé avec des données de concentrations de nutriments, de biomasses biologiques, de production biologique, de concentrations de DMS et de DMSP et de flux de DMS de la mer à l'atmosphère obtenues en 1989 dans le cadre du Projet de la mer du Nord (« North Sea Project »). Les résultats de cette validation démontrent que des modèles complexes de l'écosystème, combinés à un réseau complet des processus qui contrôlent la production et le sort du DMSP et du DMS, peuvent représenter de façon exacte la biogéochimie du DMS. Le modèle fournit des perspectives intéressantes sur l'impact du forçage physique, qui varie d'une saison à l'autre, sur les contributions relatives des divers processus particuliers à la production du DMS et à son passage de la mer à l'atmosphère.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: May 1, 2004

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  • Published continuously since 1901 (under various titles), this monthly journal is the primary publishing vehicle for the multidisciplinary field of aquatic sciences. It publishes perspectives (syntheses, critiques, and re-evaluations), discussions (comments and replies), articles, and rapid communications, relating to current research on cells, organisms, populations, ecosystems, or processes that affect aquatic systems. The journal seeks to amplify, modify, question, or redirect accumulated knowledge in the field of fisheries and aquatic science. Occasional supplements are dedicated to single topics or to proceedings of international symposia.
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