Long Term Trends in Sulphur and Nitrogen Deposition in Europe and the Cause of Non-linearities
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Emissions of sulphur and oxidized nitrogen compounds in Europe have been reduced following a series of control measures during the last two decades. These changes have taken place during a period in which the primary gases and the wet deposition throughout Europe were extensively monitored. Since the end of the 1970s, for example land based sulphur emissions declined by between 90 and 70% depending on the region. Over the same period the total deposition of sulphur and its partitioning into wet and dry deposition have declined, but the spatial pattern in the reduction in deposition differs from that of emission and has changed with time. Such non-linearities in the emission-deposition relationship are important to understand as they complicate the process of assessing the effects of emission reduction strategies. Observed non-linearities in terrestrial sulphur emission-deposition patterns have been identified in north west Europe due to increases in marine emissions, and are currently slowing the recovery of freshwater ecosystems. Changes in the relative amounts of SO2 and NH3 in air over the last two decades have also changed the affinity of terrestrial surfaces for SO2 and have therefore changed the deposition velocity of SO2 over substantial areas. The consequence of this effect has been the very rapid reduction in ambient SO2 concentration in some of the major source areas of Europe, where NH3 did not change much. Interactions between the different pollutants, generating non-linearities are now being incorporated in long-range transport models to simulate the effects of historical emission trends and to provide projections into the future. This paper identifies non-linearities in emission deposition relationships for sulphur and nitrogen compounds in Europe using data from the EMEP long-rang transport model and measured concentration fields of the major ions in precipitation and of SO2 and NO2 in surface air.
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- Long Term Trends in Sulphur and Nitrogen Deposition in Europe and the Cause of Non-linearities
Water, Air, & Soil Pollution: Focus
Volume 7, Issue 1-3 , pp 41-47
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- 1. Centre for Ecology and Hydrology, Bush Estate, Edinburgh, Scotland, EH26 0QB, UK
- 2. Energy research Centre of The Netherlands, P.O.Box 1, 1755 ZG, Petten, The Netherlands
- 3. Norwegian Meteorological Institute, P.O. Box 43, Blindern, 0313, Oslo, Norway