De Mora, S. J. and Lee, P. A. and Grout, A. and Schall, C. and Heumann, K. G. (1996) Aspects of the biogeochemistry of sulphur in glacial melt water ponds on the McMurdo Ice Shelf, Antarctica. ANTARCTIC SCIENCE, 8 (1). pp. 15-22. ISSN 0954-1020, 1365-2079
Full text not available from this repository.Abstract
The distribution of dimethylsulphide (DMS), together with the precursor dimethylsulphoniopropionate (DMSP) and the oxidation product dimethylsulphoxide (DMSO), was measured in melt waters on the McMurdo Ice Shelf in the immediate vicinity of Bratina Island. Conductivity in these sulphate dominated ponds was extremely variable, ranging from 0.106-52.3 mS cm(-1). Similarly, chlorophyll a concentrations in the pond waters (1-150 mu g l(-1)) and mats (1.4-33 mu g cm(-2)) differed considerably. The biomass was dominated by benthic felts of phototrophic cyanobacteria, which might act as a source of biogenic sulphur compounds in the ponds. The mean (and ranges) of concentrations of dissolved sulphur compounds (nmol l(-1)) were: CS2 0.16 (<0.04-1.29); DMSP(d) 0.6 (<0.07-8.4); DMS 3.5 (<0.07-183); DMSO 27.9 (15.5-184.5). Very high concentrations of DMSO were ubiquitous in the ponds in the ice-cored moraine region of the ice shelf, with dissolved concentrations having been 1-2 orders of magnitude greater than those of DMS or DMSP(d). It is difficult to ascribe the formation of DMSO solely to the conventionally accepted pathways of DMS oxidation by either bacterial activity or photochemical reactions. A direct biosynthetic production from phytoplankton or bacteria might be involved which means that DMSO in aquatic environments could act as a significant source of DMS rather than as a sink as generally supposed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DIMETHYL SULFIDE; MICROBIAL BIOMASS; DIMETHYLSULFONIOPROPIONATE; MARINE; SULFUR; DIMETHYLSULFOXIDE; PHYTOPLANKTON; OXIDATION; SULFOXIDE; ALGAE; biogeochemical cycles; meltwater; ponds; DMS; DMSO; Antarctica |
| Subjects: | 500 Science > 540 Chemistry & allied sciences 500 Science > 550 Earth sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Anorganische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 02 Nov 2023 09:06 |
| Last Modified: | 02 Nov 2023 09:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/51879 |
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