The distribution of methylated sulfur compounds, DMS and DMSP, in Canadian subarctic and Arctic marine waters during summer 2015

Jarnikova, Tereza, Dacey, John W. H., Lizotte, Martine, Levasseur, Maurice and Tortell, Philippe D. (2018) The distribution of methylated sulfur compounds, DMS and DMSP, in Canadian subarctic and Arctic marine waters during summer 2015. Biogeosciences. pp. 2449-2465. ISSN 1726-4170

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Abstract

We present seawater concentrations of dimethyl sulfide (DMS) and dimethylsulfoniopropionate (DMSP) measured across a transect from the Labrador Sea to the Canadian Arctic Archipelago during summer 2015. Using an automated ship-board gas chromatography system and a membrane-inlet mass spectrometer, we measured a wide range of DMS (g1/4g1 to 18gnM) and DMSP (g1/4 1 to 150gnM) concentrations. The highest DMS and DMSP concentrations occurred in a localized region of Baffin Bay, where surface waters were characterized by high chlorophyll (chl) fluorescence, indicative of elevated phytoplankton biomass. Across the full sampling transect, there were only weak relationships between DMS(P), chl fluorescence and other measured variables, including positive relationships between DMSPg: chl ratios and several taxonomic marker pigments, and elevated DMS(P) concentrations in partially ice-covered areas. Our high spatial resolution measurements allowed us to examine DMS variability over small scales (<g1gkm), documenting strong DMS concentration gradients across surface hydrographic frontal features. Our new observations fill in an important observational gap in the Arctic Ocean and provide additional information on sea-air DMS fluxes from this ocean region. In addition, this study constitutes a significant contribution to the existing Arctic DMS(P) dataset and provides a baseline for future measurements in the region.

Item Type:	Article
Additional Information:	Data availability: All data are available at the following github repository: https://github.com/tjarnikova/Jarnikova_Canadian_Arctic_DMS_supldata (https://doi.org/10.5281/zenodo.160225) (Jarníková, 2018).
Faculty \ School:	Faculty of Science > School of Environmental Sciences
UEA Research Groups:	University of East Anglia Schools > Faculty of Science > Tyndall Centre for Climate Change Research Faculty of Science > Research Centres > Tyndall Centre for Climate Change Research
Depositing User:	LivePure Connector
Date Deposited:	18 Mar 2026 09:30
Last Modified:	18 Mar 2026 09:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/102390
DOI:	10.5194/bg-15-2449-2018

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