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ECN publication
Title:
Biogenic and reduced atmospheric sulphur compounds in theNetherlands
 
Author(s):
 
Published by: Publication date:
ECN 1995
 
ECN report number: Document type:
ECN-C--95-014 ECN publication
 
Number of pages: Full text:
35 Download PDF  

Abstract:
Organo sulphur compounds were measured at a site close to the North Seain the Netherlands during the summer of 1992 and 1993. The concentration of dimethyl sulfide (DMS) and DMS reaction products in the air is less than 200 ngS/m3, but sometimes higher concentrations were found. Only small amounts of DMS are formed in the Wadden Sea, leading to extra concentrations up to 30 ngS/m3. Most of the DMS observed in the Netherlands probably originates from the northern part of the North Sea. The concentration of H2S is about 200 ngS/m3 with a range from 20 to 1600 ngS/m3. It is not clear whether all H2S is of a biogenic origin. The H2S concentration has to be added to the oxidized S-balance because of its fast oxidation rate. The contribution of SO2 and sulphates formed from DMS, DMS reaction products and H2S to the deposition of oxidized sulphur in the Netherlands is between 2 and 4%; only a part of the H2S is expected to be of anthropogenic origin. The error in the measurements and the deposition estimates is still considerable. COS and CS2 have been observed in high concentrations (754 respectively 384 ngS/m3), but the contribution of these compounds to the S-deposition in the Netherlands (via conversion to SO2 or SO4) can be neglected, because of the long atmospheric lifetime caused by a negligible deposition velocity and a slow oxidation to SO2. 8 figs., 3 tabs., 1 appendix, 22 refs.


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