To measure and parameterize deposition/emission fluxes of ozone and SO2 for conditions and ecosystems prevalent in Southern Europe, and to improve and validate existing deposition models.
Management and air quality in Europe will be based, in the future, on the critical load concept. Abatement strategies supported on critical load transgression require adequate and accurate deposition data.
Protocols for reducing sulphur and nitrogen deposition in Europe have been and will be proposed in the near future. These protocols are based on studies involving long range transport models (LRTM). Presently LRTM results have errors, as large as 30 %, derived principally from incorrect parameterization of pollutants' deposition.
It was recognised during recent BIATEX of EUROTRAC Workshops in Goeteborg and Aveiro that a better parameterization of surface resistances is urgently needed, and can be produced in the period 1994-96, but on the condition that a minimum amount of validation work is carried out in Southern Europe. The present proposals for generalisations, centred on factors like stomatal control for deposition of compounds such as ozone, and the important role of water layers in the deposition processes of SO2, have been derived from measurements performed mainly in Northern and North-western parts of Europe. Validation of this approach for areas in Southern Europe has until now been impossible in view of lack of necessary high-quality dry deposition data.
Measurements of deposition fluxes of SO2 and ozone will be carried out over different ecosystems and under different conditions, at four sites in southern Europe with characteristics of pollution, climatology and surface coverage representative of the various ecosystems existent in this region. At each site measurements will be performed during several seasons, for periods as long as feasible, to cover all conditions existent during the year.
The measurements will be interpreted to identify future activities to complete the results obtained.
Funding SchemeCSC - Cost-sharing contracts
3720 BA Bilthoven
EH26 0QB Penicuik
2600 JA Delft