Assessment of Ammonia and Ammonium Trends and Relationship to Critical Levels in the UK National Ammonia Monitoring Network (NAMN)

  • Y. Sim Tang
  • Ulrike Dragosits
  • Netty van Dijk
  • Linda Love
  • Ivan Simmons
  • Mark A. Sutton

The UK National Ammonia Monitoring Network (NAMN, Sutton et al. 2001a) was established in 1996 to quantify the spatial distribution and long-term trends in concentrations of atmospheric ammonia (NH3) and also aerosol ammonium (NH4+) (since 1999). There are currently 94 sites. At 59 of these sites, the CEH DELTA methodology (Sutton et al. 2001b) is used to provide the spatial and temporal patterns of NH3 and aerosol NH4+ across the UK, while passive diffusion samplers (Tang et al. 2001) are used to assess regional and local scale variability in air NH3 concentrations in source regions. Monitoring is on a monthly timescale, which is optimal to provide information on seasonality and for estimating annual mean in air concentrations.

Emissions of NH3 in the UK have fallen by 12% between 1990 and 2004 (http://www.naei.org.uk). The long-term dataset from the UK NAMN, which comprises 9 years of gaseous NH3 data (since September 1996) and 7 years of aerosol NH4+ data (since 1999) may therefore be analysed to assess trends in air concentrations. The data can also be used to compare with critical levels of NH3 concentrations set in the UK to protect vegetation and ecosystem.

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References

  1. Dragosits U., Sutton M.A. (2005) Maps of Ammonia emissions from agriculture, waste, nature and other miscellaneous sources for the NAEI 2003. Report to AEAT/DEFRA.Google Scholar
  2. NEGTAP (2001) Transboundary air pollution: acidification, eutrophication and ground level ozone in the UK. Report of the National Expert Group on Transboundary Air Pollution, DEFRA, London.Google Scholar
  3. Sutton M.A., Tang Y.S., Dragosits U., Fournier N., Dore T., Smith R.I., Weston K.J., Fowler D. (2001a) A spatial analysis of atmospheric ammonia and ammonium in the UK. The Scientific World 1(S2), 275–286.Google Scholar
  4. Sutton M.A., Tang Y.S., Miners B., Fowler D. (2001b) A new diffusion denuder system for long-term, regional monitoring of atmospheric ammonia and ammonium. WASP: Focus 1, 145–156.Google Scholar
  5. Tang Y.S., Cape J.N., Sutton M.A. (2001) Development and types of passive samplers for NH3and NOx. The Scientific World 1, 513–529.Google Scholar

Copyright information

© Springer Science + Business Media B.V. 2009

Authors and Affiliations

  • Y. Sim Tang
    • 1
  • Ulrike Dragosits
    • 1
  • Netty van Dijk
    • 1
  • Linda Love
    • 1
  • Ivan Simmons
    • 1
  • Mark A. Sutton
    • 1
  1. 1.Centre for Ecology & HydrologyBush EstatePenicuikUnited Kingdom

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