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. We present seawater concentrations of dimethyl sulfide (DMS) anddimethylsulfoniopropionate (DMSP) measured across a transect from theLabrador Sea to the Canadian Arctic Archipelago during summer 2015. Using anautomated ship-board gas chromatography system and a membrane-inlet massspectrometer, we measured a wide range of DMS ( ∼  1 to 18 nM)and DMSP ( ∼  1 to 150 nM) concentrations. The highest DMS andDMSP concentrations occurred in a localized region of Baffin Bay, wheresurface waters were characterized by high chlorophyll  a (chl  a )fluorescence, indicative of elevated phytoplankton biomass. Across the fullsampling transect, there were only weak relationships between DMS(P), chl  a fluorescence and other measured variables, including positive relationshipsbetween DMSP  :  chl  a ratios and several taxonomic marker pigments, andelevated DMS(P) concentrations in partially ice-covered areas. Our highspatial resolution measurements allowed us to examine DMS variability oversmall scales (< 1 km), documenting strong DMS concentration gradientsacross surface hydrographic frontal features. Our new observations fill in animportant observational gap in the Arctic Ocean and provide additionalinformation on sea–air DMS fluxes from this ocean region. In addition, thisstudy constitutes a significant contribution to the existing Arctic DMS(P)dataset and provides a baseline for future measurements in the region.

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