Articles | Volume 18, issue 2
https://doi.org/10.5194/acp-18-705-2018
https://doi.org/10.5194/acp-18-705-2018
Research article
 | 
22 Jan 2018
Research article |  | 22 Jan 2018

Drivers for spatial, temporal and long-term trends in atmospheric ammonia and ammonium in the UK

Yuk S. Tang, Christine F. Braban, Ulrike Dragosits, Anthony J. Dore, Ivan Simmons, Netty van Dijk, Janet Poskitt, Gloria Dos Santos Pereira, Patrick O. Keenan, Christopher Conolly, Keith Vincent, Rognvald I. Smith, Mathew R. Heal, and Mark A. Sutton

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Latest update: 28 Mar 2024
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Short summary
A unique long-term dataset of NH3 and NH4+ data from the NAMN is used to assess spatial, seasonal and long-term variability across the UK. NH3 is spatially variable, with distinct temporal profiles according to source types. NH4+ is spatially smoother, with peak concentrations in spring from long-range transport. Decrease in NH3 is smaller than emissions, but NH4+ decreased faster than NH3, due to a shift from stable (NH4)2SO4 to semi-volatile NH4NO3, increasing the atmospheric lifetime of NH3.
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