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Air and Precipitation Quality and Trends in Europe Results of the EMEP Network

  • K. Nodop
  • H.-W Georgii

Summary

Results of the EMEP network consisting of 87 background stations in 24 countries are summarized in this presentation. The large-scale spatial distribution of S and N compounds is shown in maps for 1985. The areas of maximum concentrations of SO2 and NO2 compare well with major emission areas in Europe. Wet deposition patterns of non-marine sulfate, nitrate and ammonium are mainly governed by their concentration fields and less by the precipitation amount.

After international agreements on sulfur and oxidized nitrogen emission reduction have been signed by most European countries it is important to investigate how the changes in emissions affect concentration and deposition levels observed. By a single station statistic looking at averages or frequency distributions no significant trend could be observed. First a stratification of the data from different stations into subsets with back trajectories from a common area made it possible to relate a downward trend in concentration to a reduction in emission. In western Europe sulfur concentrations in air and precipitation have decreased.

Keywords

Emission Reduction Precipitation Amount Median Concentration Sulfur Emission Back Trajectory 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. (1).
    UN (1987) National Strategies and Policies for Air Pollution Abatement, Convention on Long-Range Trans-Boundary Air Pollution. ECE/EB.Air/14 United Nations, New YorkGoogle Scholar
  2. (2).
    Saltbones (1988) personal communicationsGoogle Scholar
  3. (3).
    Clark P.A., Fisher B.E.A.,.Scriven R.A. (1987) The wet deposition of sulphate and its relationship to sulphur dioxide emissions. Atmos. Env. Vol 21 1125 – 1131CrossRefGoogle Scholar

Copyright information

© ECSC, EEC, EAEC, Brussels and Luxembourg 1990

Authors and Affiliations

  • K. Nodop
    • 1
  • H.-W Georgii
    • 1
  1. 1.Universitätsinstitut für Meteorologie und GeophysikFrankfurtGermany

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