Effects of light and phosphorus on summer DMS dynamics in subtropical waters using a global ocean biogeochemical model
Italo Masotti A B E , Sauveur Belviso A , Laurent Bopp A , Alessandro Tagliabue C and Eva Bucciarelli D
+ Author Affiliations
- Author Affiliations
A Laboratoire des Sciences du Climat et de l’Environnement, CEA/Saclay, UMR 8212, l’Orme des Merisiers, Bâtiment 712, F-91191 Gif sur Yvette, France.
B Facultad de Ciencias del Mar y de Recursos Naturales, Universidad de Valparaíso, Casilla 5080, Reñaca, Viña del Mar, Chile.
C School of Environmental Sciences, University of Liverpool, Liverpool, L69 3GP, UK
D Université de Brest, CNRS, IRD, UMR 6539, LEMAR, IUEM, F-29280 Plouzané, France.
E Corresponding author. Email: italo.masotti@uv.cl
Environmental Chemistry 13(2) 379-389 https://doi.org/10.1071/EN14265
Submitted: 12 December 2014 Accepted: 20 May 2015 Published: 17 September 2015
Environmental context. Models are needed to predict the importance of the changes in marine emissions of dimethylsulfide (DMS) in response to ocean warming, increased stratification and acidification, and to evaluate the potential effects on the Earth’s climate. We use complementary simulations to further our understanding of the marine cycle of DMS in subtropical waters, and show that a lack of phosphorus may exert a more important control on surface DMS concentrations than an excess of light.
Abstract. The occurrence of a summer DMS paradox in the vast subtropical gyres is a strong matter of debate because approaches using discrete measurements, climatological data and model simulations yielded contradictory results. The major conclusion of the first appraisal of prognostic ocean DMS models was that such models need to give more weight to the direct effect of environmental forcings (e.g. irradiance) on DMS dynamics to decouple them from ecological processes. Here, the relative role of light and phosphorus on summer DMS dynamics in subtropical waters is assessed using the ocean general circulation and biogeochemistry model NEMO-PISCES in which macronutrient concentrations were restored to monthly climatological data values to improve the representation of phosphate concentrations. Results show that the vertical and temporal decoupling between chlorophyll and DMS concentrations observed in the Sargasso Sea during the summer months is captured by the model. Additional sensitivity tests show that the simulated control of phosphorus on surface DMS concentrations in the Sargasso Sea is much more important than that of light. By extending the analysis to the whole North Atlantic Ocean, we show that the longitudinal distribution of DMS during summer is asymmetrical and that a correlation between the solar radiation dose and DMS concentrations only occurs in the Sargasso Sea. The lack of a widespread summer DMS paradox in our model simulation as well as in the comparison of discrete and climatological data could be due to the limited occurrence of phosphorus limitation in the global ocean.
Additional keywords: global modelling, Sargasso Sea, solar radiation dose.
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