Occurrence and Turnover of Biogenic Sulfur in the Bering Sea During Summer

The horizontal/geographical variations in dissolved dimethylsulfide (DMS), its precursor dimethylsulfoniopropionate (DMSPd and DMSPp), and chlorophyll a (Chl a), as well as the oceanographic parameters influencing the concentrations of dimethylated sulfur compounds, were investigated in the Bering S...

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Bibliographic Details
Published in:Journal of geophysical research. Oceans 2017-11, Vol.122 (11), p.8567-8592
Main Authors: Li, Cheng‐Xuan, Wang, Bao‐Dong, Yang, Gui‐Peng, Wang, Zi‐Cheng, Chen, Jian‐Fang, Lyu, Yang
Format: Article
Language:English
Subjects:
Bacteria
Bering Sea
Chlorophyll
Chlorophyll a
Consumption
Continental shelves
Cyanobacteria
Deep water
Dimethyl sulfide
dimethylsulfide
dimethylsulfoiopropionate
Dimethylsulphoniopropionate
Fluxes
Geographical variations
Geophysics
Microorganisms
Mineral nutrients
Nutrients
Oceanographic parameters
Phosphorus
production and consumption
Removal
Resuspension
sea‐to‐air flux
Silicates
Sulfur
Sulfur budget
Sulfur compounds
Sulphur
Surface water
Temperature (air-sea)
Ventilation
Water
Water treatment
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Summary:The horizontal/geographical variations in dissolved dimethylsulfide (DMS), its precursor dimethylsulfoniopropionate (DMSPd and DMSPp), and chlorophyll a (Chl a), as well as the oceanographic parameters influencing the concentrations of dimethylated sulfur compounds, were investigated in the Bering Sea from July to August 2012. Similar to Chl a, the surface DMS and DMSPp levels, as well as DMS(P) production and consumption rates, exhibited a declining gradient from the central basin to the continental shelf, with high‐value areas appearing in the central basin, the slope regions, and Anadyr Strait but a low‐value area occurring on the outer‐middle continental shelf. Considerably high values of DMS and DMSP were measured in the saline Bering Sea Basin Deep Water (>2,000 m) located at the southwest of the Bering Basin because of the release of resuspension in 2,000 m depth and the DMSP production from endogenous benthic bacteria and cyanobacteria population. Chl a was positively correlated with DMSPp and DMS in the surface waters and the upper water of the basin, whereas significant negative correlations were found between DMS and nutrients (dissolved inorganic nitrogen [DIN], phosphorus, and silicate) in the inner shelf of the Bering Sea. DMS microbial consumption was approximately 6.26 times faster than the DMS sea‐air exchange, demonstrating that the major loss of DMS in the surface water occurred through biological consumption relative to evasion into the atmosphere. Average sea‐to‐air DMS fluxes were estimated to be 4.66 μmol/(m2·d), and consequently oceanic biogenic DMS emission had a dominant contribution to the sulfur budget over the observational area. Key Points The surface DMS and DMSPp levels exhibited a declining gradient from the central basin to the continental shelf Significant levels of DMS and DMSP were observed at depths of up to 2,000 m in the southwest saline Bering Sea Basin Deep Water Biological consumption, relative to ventilation, is a predominant mechanism in DMS removal from the surface water
ISSN:2169-9275
2169-9291
DOI:10.1002/2017JC013299