Articles | Volume 16, issue 18
Atmos. Chem. Phys., 16, 12305–12328, 2016
https://doi.org/10.5194/acp-16-12305-2016
Atmos. Chem. Phys., 16, 12305–12328, 2016
https://doi.org/10.5194/acp-16-12305-2016

Research article 29 Sep 2016

Research article | 29 Sep 2016

Interannual variability of ammonia concentrations over the United States: sources and implications

Luke D. Schiferl et al.

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This study combines new observations and a simulation to assess the interannual variability of atmospheric ammonia concentrations over the United States. The model generally underrepresents the observed variability. Nearly two-thirds of the simulated variability is caused by meteorology, twice that caused by regulations on fossil fuel combustion emissions. Adding ammonia emissions variability does not substantially improve the simulation and has little impact on summer particle concentrations.
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