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Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains

January 1, 2001

Building on the discovery of excess 17O in atmospheric sulfate by Lee et al. (2001), we have carried out a case study to determine whether 17O might provide a new tool for quantifying the impact of atmospheric deposition on surface-water sulfate loads. In Rocky Mountain alpine regions, excess 17O was found to be characteristics of atmospheric sulfate deposited in snow. Excess 17O was also evident in stream sulfate in one of two high-elevation watersheds where analyses were made. Isotope mass balance calculations gave surprizingly low atmospheric contributions to stream sulfate suggesting that (1) despite abundant outcrop and sparse soil in these areas, significant sulfate may be taken up and released by soil microbes before being exported in streams, and (2) surface waters can carry multiple non-atmospheric sulfate types, some possibly anthropogenic. Measurements of 17O may prove very useful in studies of sulfate behavior in a variety of surficial environments.

Citation Information

Publication Year 2001
Title Use of 17O/16O to trace atmospherically-deposited sulfate in surface waters: A case study in alpine watersheds in the Rocky Mountains
DOI 10.1029/2001GL012966
Authors C.A. Johnson, M.A. Mast, C.L. Kester
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Index ID 70023465
Record Source USGS Publications Warehouse