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- Title
A 50-year record of NO<sub>x</sub> and SO<sub>2</sub> sources in precipitation in the Northern Rocky Mountains, USA.
- Authors
Naftz, David L.; Schuster, Paul F.; Johnson, Craig A.
- Abstract
Ice-core samples from Upper Fremont Glacier (UFG), Wyoming, were used as proxy records for the chemical composition of atmospheric deposition. Results of analysis of the ice-core samples for stable isotopes of nitrogen (δ15N, NO3-) and sulfur (δ34S, SO42-), as well as NO-3 and SO42- deposition rates from the late-1940s thru the early-1990s, were used to enhance and extend existing National Atmospheric Deposition Program/National Trends Network (NADP/NTN) data in western Wyoming. The most enriched δ34S value in the UFG ice-core samples coincided with snow deposited during the 1980 eruption of Mt. St. Helens, Washington. The remaining δ34S values were similar to the isotopic composition of coal from southern Wyoming. The δ15N values in ice-core samples representing a similar period of snow deposition were negative, ranging from -5.9 to -3.2 ‰ and all fall within the δ15N values expected from vehicle emissions. Ice-core nitrate and sulfate deposition data reflect the sharply increasing U.S. emissions data from 1950 to the mid-1970s.
- Subjects
ROCKY Mountains; WYOMING; ATMOSPHERIC deposition; SULFUR compounds; NITROGEN compounds; ISOTOPES; GLACIERS
- Publication
Geochemical Transactions, 2011, Vol 12, Issue 1, p4
- ISSN
1467-4866
- Publication type
Article
- DOI
10.1186/1467-4866-12-4