JEG DM: common work items

1. Targets & ex post analysis • Robustness • Links with biodiversity • Trends in selected modeled/measured parameters JEG DM: common work items

2. 1. Two aspirational targets for 2050 that should be incorporated into policy: no further enrichment of nitrogen (N) in soils resulting from atmospheric deposition, and no further depletion of base cations from soils resulting from atmospheric deposition. 2. Target loads have been developed at the European scale. CIAM should undertake at least one run of optimization based on target loads. JEG DM: Targets & ex-post

3. 3. The lack of base cation deposition estimates remained problematic for the dynamic models on ecological impact. 4. For the revision of the 1999 Gothenburg Protocol, dynamic models must take climate change and related policies into account in predictions, as they systematically change the rate of key processes. As a consequence, current predictions with dynamic models might be too pessimistic. JEG DM: Robustness

4. 5. At N limited ecosystems N deposition leads to C sequestration. But, at very high N deposition plant growth is reduced. Biomass productivity could also be limited by other factors (e.g., trace nutrients, water, energy). Need further research on those factors. 6. Developments on model systems such as VSD+ and SPECIES; VEGontoVSD; BERN model; ForSAFE-VEG. We need a comparative study of the parameterization of the different models. JEG DM: Links with biodiversity

5. 7. Need to quantify existing biodiversity targets in relation to the model outputs. 8. Need to develop biological models to assess the impact of N as a nutrient for aquatic ecosystems. Need to enhance those aquatic models with internal process feedbacks related to climate change and land management. 9. We need data from sites with long-term records (decades) to evaluate and test dynamic models. JEG DM: Links with biodiversity

6. JEG has nothing to report JEG DM: Trends