NILU - The Norwegian Institute for Air Research

EIF air: Calculating enviromental risk


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Environmental Impact Factors (EIF-air) for atmospheric emissions have been developed to quantify the impact of air emissions on the environment. The EIF-air has proven to give good results for distinguishing the impact for different emission control actions, not only for one single plant but also where the emission control is optimised for different locations. This means that the results may be used to evaluate alternative locations in the planning phase.

Environmental Impact Factors (EIF) has been developed in collaboration with Statoil, Norwegian Institute for Water Research (NIVA) and Norwegian Institute for Nature Research (NINA) for evaluation of impact of emissions in the offshore industry.

The EIF-air has been designed to take into account emissions of nitrogen oxides and sulphur dioxide from point sources and shipping activities in the offshore industry. The focus has been to estimate the effects on vegetation and surface water in the areas where these emissions have their impact.

The model is developed in such a way that differences in effects can be evaluated. The effects that are contained in the factor so far are the following:

  • Deposition of nitrogen
  • Acidification of surface water
  • Impacts of nitrogen deposition on vegetation
  • Production/destruction of ozone as a result of NOx and VOC emissions
EIF air: Calculating enviromental risk

The main building blocks in the core system are as follows:

  • Dispersion model calculating the deposition of nitrogen and sulphur
  • Establishing the extra impact on acidification from the emission at hand
  • Calculating the EIF-Air for the scenario

The system needs the following static inputs:

  • Meteorological information (one fixed year, including dispersion parameters)
  • Background deposition of nitrogen and sulphur (gridded)
  • Background AOT40 values for ozone (gridded)
  • Critical levels for acidification of surface water and eutrofication of vegetation (gridded)

The modelling system has been developed to automatic prepare input to the databases and to make this information available for presentation online via a user-friendly web interface.

Plans are now being further developed to establish an interactive, user-friendly web-based support tool for EIF-Air for the estimation of environmental impact of critical loads of emissions from the Norwegian oil and gas industry.

EIF air: Calculating enviromental risk

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