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Manual for Dynamic Modelling of Soil Response to Atmospheric DepositionThe objective of this manual is to inform the network of National Focal Centers (NFCs) about the requirements of methodologies for the dynamic modelling of geochemical processes in soils in particular. This information is necessary to support European air quality policies with knowledge on time delays of ecosystem damage or recovery caused by changes, in time, of acidifying deposition. This manual has been requested by bodies under the Convention on Long-range Transboundary Air Pollution (CLRTAP) to support the extension of the European critical load database with dynamic modelling parameters. A Very Simple Dynamic (VSD) model is described to encourage NFCs to meet minimum data requirements upon engaging in the extension of national critical load databases. This manual can be consulted in combination with a running version of VSD which is available on www.rivm.nl/cce. The manual also provides an overview of existing dynamic models which generally have more complex input data requirements. Finally, the manual tentatively describes possible linkages between dynamic modelling results and integrated air pollution assessment modelling. This linkage is necessary for use in the near future support of the review of the 1999 CLRTAP Protocol to Abate Acidification, Eutrophication and Ground-level Ozone (the "Gothenburg Protocol") and the 2001 EU National Emission Ceiling directive.
Modelling and Mapping of Critical Thresholds in EuropeThis report informs parties under the Convention on Long-range Transboundary Air Pollution (CLRTAP) and its network of National Focal Centres on the recent update of the European critical loads database. In 2003 this database underwent a first time extension with dynamic modelling variables. This information is necessary to support European air quality policies with knowledge on time delays of ecosystem damage or recovery caused by changes, in time, of acidifying deposition. The database was updated and extended following the request of the Working Group on Effects at its 21st session (Geneve, 28-30 augustus 2002). Nineteen countries submitted data on critical loads for acidity and eutrophication. Ten countries also submitted the requested dynamic modelling parameters. Other countries indicated their intentions to prepare data for submission for the next call planned for the autumn of 2003. It is concluded that minimum data requirements for dynamic modelling can be met. The report contains national reports on the methods applied to contribute to the European critical loads data base. The report includes an analysis of the data to verify cross border consistency. A comparison is made with the database used to support negotiations of the 1999 CLRTAP Protocol to Abate Acidification, Eutrophication and Ground-level Ozone (the "Gothenburg Protocol") and the 2001 EU National Emission Ceiling directive. The results described in this report are important for the next step in the support of the revision process of these European agreements expected in 2004/2005. The report will be presented at the 22nd session of the Working Group on Effects (Geneva, 3-5 September 2003).