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ECN publication
Critical Loads and Present Deposition Thresholds of Nitrogen and Acidity and their Exceedances at Level II and Level I Monitoring Plots in Europe
Published by: Publication date:
ECN Biomass, Coal and Environmental Research 1-12-2004
ECN report number: Document type:
ECN-C--04-117 ECN publication
Number of pages: Full text:
155 Download PDF  


This report presentsan assessment of site specific deposition estimates and critical load exceedances of sulphur and nitrogen for selected Intensive Monitoring plots based on input and output estimates and extrapolation to a European wide scale. Depositions for the individual monitoring plots were calculated by means of a high-resolution deposition model (IDEM) and the results were compared to measured depositions for selected Intensive Monitoring sites. Also for the European Level I sites deposition estimates were computed. Not only the deposition of sulphur and nitrogen compounds was determined, but also the deposition of base cations was calculated. For this an approach was used, mainly based on available measurement data from the Intensive Monitoring sites. This derived model was also used to extrapolate to the Level I sites and Intensive Monitoring sites without deposition measurements.

  Critical loads according to the effect-based and stand-still approach were calculated, as well as present deposition thresholds for both the Intensive Monitoring sites and the Level I sites. Using the deposition calculations and critical loads/present deposition thresholds, exceedances of these target loads were calculated and presented. The uncertainties involved in these calculations were evaluated and finally conclusions were drawn on the basis of the results of the different calculations.

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