| Abstract: | Stable sulfur (S) isotope ratios can be used to identify the sources of sulfate contributing to streamwater. We collected weekly and high-flow stream samples for S isotopic analysis of sulfate through the entire water year 2003 plus the snowmelt period of 2004. The study area was the 41-ha forested W-9 catchment at Sleepers River Research Watershed, Vermont, a site known to produce sulfate from weathering of sulfide minerals in the bedrock. The ??34S values of streamwater sulfate followed an annual sinusoidal pattern ranging from about 6.5??? in early spring to about 10??? in early fall. During high-flow events, ??34S values typically decreased by 1 to 3??? from the prevailing seasonal value. The isotopic evidence suggests that stream sulfate concentrations are controlled by: (1) an overall dominance of bedrock-derived sulfate (??34S ~ 6-14???); (2) contributions of pedogenic sulfate (??34S ~ 5-6???) during snowmelt and storms with progressively diminishing contributions during base flow recession; and (3) minor effects of dissimilatory bacterial sulfate reduction and subsequent reoxidation of sulfides. Bedrock should not be overlooked as a source of S in catchment sulfate budgets. |
| Genre: | Article |
| ProdID: | 70033425 |
| Citation Author: | Shanley, J. B.; Mayer, B.; Mitchell, M. J.; Bailey, S. W. |
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| Citation End Page: | 268 |
| Citation Issue: | 2-3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Science of the Total Environment |
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| Citation Number Of Pages: | 7 |
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| Citation Search Results Text: | Seasonal and event variations in ??34S values of stream sulfate in a Vermont forested catchment: Implications for sulfur sources and cycling; 2008; Article; Journal; Science of the Total Environment; Shanley, J. B.; Mayer, B.; Mitchell, M. J.; Bailey, S. W. |
| Citation Start Page: | 262 |
| Citation Volume: | 404 |
| Citation Year: | 2008 |
| Type: | citation/reference |
| Text: | Seasonal and event variations in ??34S values of stream sulfate in a Vermont forested catchment: Implications for sulfur sources and cycling; 2008; Article; Journal; Science of the Total Environment; Shanley, J. B.; Mayer, B.; Mitchell, M. J.; Bailey, S. W. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/j.scitotenv.2008.03.020 |
| Date Other: | Tue, 1 Jan 2008 00:00 -0600 |
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