Articles | Volume 17, issue 13
https://doi.org/10.5194/acp-17-8269-2017
https://doi.org/10.5194/acp-17-8269-2017
Research article
 | 
07 Jul 2017
Research article |  | 07 Jul 2017

Changes to the chemical state of the Northern Hemisphere atmosphere during the second half of the twentieth century

Mike J. Newland, Patricia Martinerie, Emmanuel Witrant, Detlev Helmig, David R. Worton, Chris Hogan, William T. Sturges, and Claire E. Reeves

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Latest update: 19 Feb 2024
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Short summary
We report increasing levels of alkyl nitrates in the Northern Hemisphere atmosphere between 1960 and the mid-1990s. These increases are symptomatic of large-scale changes to the chemical composition of the atmosphere, particularly with regards to the amounts of short-lived, reactive species. The observed increases are likely driven by increasing levels of nitrogen oxides. These changes have direct implications for the lifetimes of climate-relevant species in the atmosphere, such as methane.
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