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Use of stable isotope ratios for evaluating sulfur sources and losses at the Hubbard Brook Experimental Forest
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
 
ID 86898
Author(s) Mitchell, MJ; Mayer, B; Bailey, SW; Hornbeck, JW; Alewell, C; Driscoll, CT; Likens, GE
Author(s) at UniBasel Alewell, Christine
Year 2001
Title Use of stable isotope ratios for evaluating sulfur sources and losses at the Hubbard Brook Experimental Forest
Journal Water, air and soil pollution
Volume 130
Number 1-4
Pages / Article-Number 75-86
Keywords atmospheric deposition, organic S, S budgets, stable isotopes, watersheds, weathering
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.

Publisher Kluwer
ISSN/ISBN 0049-6979
edoc-URL http://edoc.unibas.ch/dok/A5251169
Full Text on edoc No
ISI-Number WOS:000171538500010
Document type (ISI) ArticleProceedings Paper
 
   

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