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Author
Morin, S.; Savarino, J.; Frey, M.M.; Yan, N.; Bekki, S.; Bottenheim, J.W.; Martins, J.M.F.
Title
Tracing the Origin and Fate of NOx in the Arctic Atmosphere Using Stable Isotopes in Nitrate
Type
Journal Article
Year
2008
Publication
Science
Abbreviated Journal
Science
Volume
322
Issue
5902
Pages
730-732
Keywords
Abstract
Atmospheric nitrogen oxides (NOx =NO+ NO2) play a pivotal role in the cycling of reactive nitrogen (ultimately deposited as nitrate) and the oxidative capacity of the atmosphere. Combined measurements of nitrogen and oxygen stable isotope ratios of nitrate collected in the Arctic atmosphere were used to infer the origin and fate of NOx and nitrate on a seasonal basis. In spring, photochemically driven emissions of reactive nitrogen from the snowpack into the atmosphere make local oxidation of NOx by bromine oxide the major contributor to the nitrate budget. The comprehensive isotopic composition of nitrate provides strong constraints on the relative importance of the key atmospheric oxidants in the present atmosphere, with the potential for extension into the past using ice cores.
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1011
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Summary Language
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0036-8075
ISBN
Medium
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Conference
Notes
10.1126/science.1161910
Approved
yes
Call Number
IPEV @ Thierry.Lemaire @
Serial
5513
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