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The dimethylsulphide propionate (DMSP) content in microalgae and its influence on DMS emission: Experimental and modelling study in the Southern North Sea

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Keywords
  • Life Sciences :: Aquatic Sciences & Oceanology [F04]
  • Sciences Du Vivant :: Sciences Aquatiques & Océanologie [F04]
Disciplines
  • Ecology
  • Geography
  • Political Science

Abstract

Geophysical Research Abstracts Vol. 15, EGU2013-7145, 2013 EGU General Assembly 2013 © Author(s) 2013. CC Attribution 3.0 License. The dimethylsulphide propionate (DMSP) content in microalgae and its influence on DMS emission: Experimental and modelling study in the Southern North Sea Nathalie Gypens (1), Alberto V Borges (2), Sébastien Paulet (2), Jean-Yves Parent (1), and Christiane Lancelot (1) (1) Université Libre de Bruxelles, Ecologie des Systèmes Aquatiques, Bruxelles, Belgium ([email protected]), (2) Université de Liège, MARE, Unité d’Océanographie Chimique, Institut de Physique (B5), B-4000, Belgium Dimethylsulphide propionate (DMSP) is the precursor of dimethyl sulphide (DMS), a potentially key player in climate regulation. Current knowledge suggests that DMSP synthesis is restricted to some microalgae (mainly Haptophyceae and Dinophyceae) and varies with environmental conditions. Assessing the species-dependence and regulation mechanisms of DMSP microalgal quotas is the first step towards appraising the role of DMS in climate feedback mechanisms. Here we use a combination of laboratory studies and model simulations to deter- mine to which extent the variations of the microalgal DMSP content might affect marine DMS emissions to the atmosphere. The Southern North Sea is chosen as case study, as it is characterized by diatoms/Phaeocystis succes- sions, two phytoplankters known as contrasted DMSP producers. The DMSP:cell content of Phaeocystis globosa and two diatoms, Skeletonema costatum and Chaetoceros socialis, was measured on pure monospecific cultures. While P. globosa and C. socialis showed respectively expected high and low DMSP content, the cell quota mea- sured for S. costatum was unexpectedly high. Based on these results, the sensitivity of the DMS emissions to the variability of the DMSP content of microalgae was estimated by using the MIRO-DMS model. This model cou- ples a DMSP/DMS module to the ecological MIRO model describing carbon and nutrient cycle in the planktoni

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