| Abstract: | Total mercury (Hg) deposition and input/output relationships were investigated in an 11-ha deciduous forested catchment in northern Vermont as part of ongoing evaluations of rig cycling and transport in the Lake Champlain basin. Atmospheric Hg deposition (precipitation + modeled vapor phase downward flux) was 425 mg ha-1 during the one-year period March 1994 through February 1995 and 463 mg ha-1 from March 1995 through February 1996. In the same periods, stream export of total Hg was 32 mg ha-1 and 22 mg ha-1, respectively. Thus, there was a net retention of Hg by the catchment of 92% the first year and 95% the second year. In the first year, 16.9 mg ha-1 or about half of the annual stream export, occurred on the single day of peak spring snowmelt in April. In contrast, the maximum daily export in the second year, when peak stream flow was somewhat lower, was 3.5 mg ha-1 during a January thaw. The fate of file Hg retained by this forested catchment is not known. Dissolved (< 0.22 ??m) Hg concentrations in stream water ranged from 0.5-2.6 ng L-1, even when total (unfiltered) concentrations were greater than 10 ng L-1 during high flow events. Total Hg concentrations in stream water were correlated with the total organic fraction of suspended sediment, suggesting the importance of organic material in Hg transport within the catchment. High flow events and transport with organic material may be especially important mechanisms for the movement of Hg through forested ecosystems. |
| Genre: | Article |
| ProdID: | 70020761 |
| Citation Author: | Scherbatskoy, T.; Shanley, J. B.; Keeler, G. J. |
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| Citation End Page: | 438 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Water, Air, and Soil Pollution |
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| Citation Number Of Pages: | 12 |
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| Citation Publisher: | Kluwer Academic Publishers |
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| Citation Search Results Text: | Factors controlling mercury transport in an upland forested catchment; 1998; Article; Journal; Water, Air, and Soil Pollution; Scherbatskoy, T.; Shanley, J. B.; Keeler, G. J. |
| Citation Start Page: | 427 |
| Citation Volume: | 105 |
| Citation Year: | 1998 |
| Type: | citation/reference |
| Text: | Factors controlling mercury transport in an upland forested catchment; 1998; Article; Journal; Water, Air, and Soil Pollution; Scherbatskoy, T.; Shanley, J. B.; Keeler, G. J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1023/A:1005053509133 |
| Date Other: | Thu, 1 Jan 1998 00:00 -0600 |
| Publisher: | Kluwer Academic Publishers |
