A 50-year record of NOx and SO2 sources in precipitation in the Northern Rocky Mountains, USA

Geochemical Transactions

Research Article

David L Naftz¹  Paul F Schuster²  Craig A Johnson³ 

[1] U.S. Geological Survey, 2329 W. Orton Circle, 84119, Salt Lake City, UT, USA;U.S. Geological Survey, 3215 Marine Street, Suite E-127, 80303, Boulder, CO, USA;U.S. Geological Survey, Denver Federal Center, MS 963, 80225, Denver, CO, USA;

关键词: Isotopic Composition;    Atmospheric Deposition;    Volcanic Eruption;    Massive Sulfide Deposit;    Firn Core;   

DOI  :  10.1186/1467-4866-12-4

 received in 2010-01-08, accepted in 2011-03-07,  发布年份 2011

来源: Springer

【 摘 要 】

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, ) and sulfur (δ34S, ), as well asanddeposition 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.

【 授权许可】

CC BY   
© Naftz et al; licensee Chemistry Central Ltd. 2011. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.