HOMS COMPONENT

REGIONAL ACID DEPOSITION MODEL

1.   Purpose and objectives 

     To calculate air concentrations, dry and wet depositions of sulphur, oxidized and reduced nitrogen due to the long-range transport of air pollutants on a European scale.

2.   Description

     EMEP Eulerian acid deposition model is used routinely by the Meteorological Synthesizing Centre West (MSC-W) in the framework of the Cooperative Programme for the Monitoring and Evaluation of the long-range transmission of air pollutants in Europe (EMEP). Using emission data from European countries (annual emissions from grid squares ca. 50km x with 50 km sides) and basic meteorological data normally available from a meteorological forecast model, dry and wet (precipitation water) 
depositions due to long-range transmission can be calculated for individual grid squares. 

3.   Input

     SO2, NO2 and NH3 emission data from individual grid squares, surface and 3-d meteorological data (e.g. wind fields and precipitation) and land use data.

4.   Output

     Gridded distribution of air concentrations, and dry and wet depositions due to the long-range transmission of air pollutants.

5.   Operational requirements and restrictions

     The model is not applicable to small-scale phenomena. Calculations for longer periods of time (a month or more) are more realistic than those for particular episodes. 

6.   Form of presentation

     The current model version is described e.g. in EMEP/MSC-W Reports 1/98, of the Norwegian Meteorological Institute, Oslo, Norway. The EMEP/MSC-W reports are updated annually.

7.   Operational experience

     Model has been in routine use since 1999.

8.   Originator and technical support

     MSC-W of EMEP, The Norwegian Meteorological Institute, Oslo, Norway.

9.   Availability

     From the HOMS National Reference Centre for Norway.

10.  Conditions on use

     The model, description and results are available in the form of the reports quoted above and the web site: www.emep.int

Last updated: 1 JUN 99)
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