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Use of stable isotope ratios for evaluating sulfur sources and losses at the Hubbard Brook Experimental Forest

Mitchell, M. J. and Mayer, B. and Bailey, S. W. and Hornbeck, J. W. and Alewell, C. and Driscoll, C. T. and Likens, G. E.. (2001) Use of stable isotope ratios for evaluating sulfur sources and losses at the Hubbard Brook Experimental Forest. Water, air and soil pollution, Vol. 130, no. 1-4. pp. 75-86.

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Official URL: http://edoc.unibas.ch/dok/A5251169

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Abstract

Anthropogenic S emissions have been declining in eastern North America since the early 1970s. Declines in atmospheric S deposition have resulted in decreases in concentrations and fluxes of SO42- in precipitation and drainage waters. Recent S mass balance studies have shown that the Outflow Of SO42- in drainage waters greatly exceeds current S inputs from atmospheric deposition. Identifying the S source(s) which contribute(s) to the discrepancy in watershed S budgets is a major concern to scientists and policy makers because of the need to better understand the rate and spatial extent of recovery from acidic deposition. Results from S mass balances combined with model calculations and isotopic analyses of SO42- in precipitation and drainage waters at the Hubbard Brook Experimental Forest (HBEF) suggest that this discrepancy cannot be explained by either underestimates of dry deposited S or desorption of previously stored SO42-. Isotopic results suggest that the excess S may be at least partially derived from net mineralization of organic S as well as the weathering of S-bearing minerals.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Umweltgeowissenschaften (Alewell)
UniBasel Contributors:Alewell, Christine
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Kluwer
ISSN:0049-6979
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:22 Mar 2012 14:28
Deposited On:22 Mar 2012 14:02

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