BG Biogeosciences BG Biogeosciences 1726-4189 Copernicus Publications Göttingen, Germany 10.5194/bg-9-1041-2012 Environmental control on the variability of DMS and DMSP in the Mauritanian upwelling region Zindler C. 1 Peeken I. 1 2 3 Marandino C. A. 1 Bange H. W. 1 Forschungsbereich Marine Biogeochemie, GEOMAR | Helmholtz-Zentrum für Ozeanforschung Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven, Germany MARUM - Center for Marine Environmental Sciences Bremen, Germany 16 03 2012 9 3 1041 1051 Copyright: © 2012 C. Zindler et al. 2012 This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/ This article is available from https://bg.copernicus.org/articles/9/1041/2012/bg-9-1041-2012.html The full text article is available as a PDF file from https://bg.copernicus.org/articles/9/1041/2012/bg-9-1041-2012.pdf

Dimethylsulphide (DMS) and dissolved and particulate dimethylsulfoniopropionate (DMSP<sub>d</sub>, DMSP<sub>p</sub>) were measured in near-surface waters along the Mauritanian coast, Northwest Africa, during the upwelling season in February 2008. DMS, DMSP<sub>d</sub> and DMSP<sub>p</sub> surface concentrations of up to 10 nmol L<sup>−1</sup>, 15 nmol L<sup>−1</sup> and 990 nmol L<sup>−1</sup>, respectively, were measured. However, the DMS concentrations measured are in the low range compared to other upwelling regions. The maximum DMSP<sub>p</sub> concentration is the highest reported from upwelling regions so far, which might indicate that the Mauritanian upwelling is a hot spot for DMSP. Within the phytoplankton groups, dinoflagellates were identified as important contributors to DMS concentrations, while other algae seemed to have only a minor or no influence on DMS and DMSP concentrations. A pronounced switch from high DMSP to high DMS concentrations was observed when the nitrogen to phosphorus ratio (N:P) was below 7. The high DMS/DMSP ratios at N:P ratios <7 indicate that nitrogen limitation presumably triggered a switch from DMSP to DMS independent of the species composition. Our results underline the importance of coastal upwelling regions as a local source for surface seawater sulphur.

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