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- Title
The distribution of methylated sulfur compounds, DMS and DMSP, in Canadian Subarctic and Arctic marine waters during summer, 2015.
- Authors
Jarníková, Tereza; Dacey, John; Lizotte, Martine; Levasseur, Maurice; Tortell, Philippe
- Abstract
We present seawater concentrations of dimethylsulfide (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 range of DMS (~ 1 nM to 18 nM) and DMSP concentrations (~ 1 nM to 150 nM) that was consistent with previous observations in the Arctic Ocean. The highest DMS and DMSP concentrations occurred in a localized region of Baffin Bay, where surface waters were characterized by high chlorophyll a (chl a) fluorescence, indicative of elevated phytoplankton biomass. Across the full sampling transect, there were only weak relationships between DMS/P, chl a fluorescence and other measured variables, including positive relationships between DMSP : chl a 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 (< 1 km), and document strong DMS concentration gradients across surface hydrographic frontal features. The new observations presented in this study constitute a significant contribution to the existing Arctic DMS/P dataset, and provide a baseline for future measurements in the region.
- Subjects
SULFUR compounds analysis; SULFUR supply &; demand; CHALCOGENS; MASS spectrometry; AFTER mass analysis
- Publication
Biogeosciences Discussions, 2017, p1
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bg-2017-337