The Dimethylsulfide Cycle in the Eutrophied Southern North Sea: A Model Study Integrating Phytoplankton and Bacterial Processes

摘要: We developed a module describing the dimethylsulfoniopropionate (DMSP) and dimethylsulfide (DMS) dynamics, including biological transformations by phytoplankton bacteria, physico-chemical processes (including DMS air-sea exchange). This was integrated in MIRO ecological model applied 0D frame Southern North Sea (SNS). The DMS(P) is built on parameterizations derived from available knowledge sources, sinks, provides an explicit representation of bacterial activity contrast to most existing models that only include process (and abiotic transformations). tested highly productive coastal ecosystem (the Belgian zone, BCZ) dominated diatoms Haptophyceae Phaeocystis, respectively low high DMSP producers. On annual basis, particulate (DMSPp) production simulated 1989 mainly related Phaeocystis colonies (78%) rather than (13%) nanoflagellates (9%). Accordingly, sensitivity analysis shows responds more changes sulfur:carbon (S:C) quota lyase yield Phaeocystis. originates equally DMSP-lyase 3% emitted atmosphere. Model demonstrates emission towards atmosphere description parameterization emphasizing need adequately representing both affecting dynamics. particularly important eutrophied environments such as SNS non-diatom blooms where empirical data-sets biased open ocean conditions do not satisfactorily predict timing amplitude seasonal cycle. In order future feedbacks emissions climate, it needed account for hotspots that, if eutrophied, are diatoms.