Review and Integration of Biosphere-Atmosphere Modelling of Reactive Trace Gases and Volatile Aerosols

Introduction<br>Organisation and structure of the workshop<br>Objectives<br>Document structure<br>References<br>Section I: Review documents<br>Advances in understanding, models and parameterisations of biosphere-atmosphere ammonia exchange<br>Modelling atmosphere-biosphere exchange of Ozone and Nitrogen oxides<br>Introduction<br>Sources and sinks processes contributing to biosphere-atmosphere exchange<br>Turbulent transport and diffusion inside the canopy<br>Existing Models<br>Shortcomings and potential improvements of models<br>Data needed for model validations<br>Links to exchange of other reactive compounds and aerosols<br>References<br>Bidirectional exchange of volatile organic compounds<br>Introduction<br>Reduced VOC<br>Atmospheric oxidation products<br>Bidirectional VOC<br>References<br>Surface / atmosphere exchange of atmospheric acids and aerosols, including the effect and model treatment of chemical interactions<br>Introduction<br>Deposition of acids<br>Deposition of aerosols<br>Chemical interactions<br>Topical research questions to be discussed<br>Acknowledgements<br>References<br>Section II: Synthesis according to compounds<br>Modelling the air-surface exchange of ammonia from the field to global scale<br>Introduction<br>Development of improved NH3 process-based bi-directional exchange models<br>Uncertainty in processes and measurement needs<br>Conclusion and model integration<br>References<br>O3 and NOx exchange<br />Introduction<br>Product of the discussion<br>Areas of uncertainty<br>Conclusions<br>References<br>Bi-directional exchange of volatile organic compounds<br>Introduction<br>Current parameterizations in CTMs for reduced VOC and atmospheric oxidation products<br>Gaps and disadvantages of current parameterizations<br>The ideal model<br>Conclusion<br>References<br>Aerosol and Acid Gases&lt;<br>Introduction<br>Products of the Discussion<br>Areas of Uncertainty<br>Conclusions<br>References<br>Section III: Synthesis according to model component<br>Gaseous stomatal exchange and relation to ecosystem functioning<br>Introduction<br>Key processes to account for in stomatal trace gas exchange models<br>Framework of a common conceptual model adapted to different compounds: Stomatal exchange<br>Research needs for future developments<br>Conclusion<br>References<br>Impact of leaf surface and in-canopy air chemistry on the ecosystem/atmosphere exchange of atmospheric pollutants<br>Introduction<br>Current status and knowledge gaps<br>Possibility of a common framework<br>References<br>Soil and litter exchange of reactive trace gases<br>Introduction<br>Products of the Discussion<br>Areas of uncertainty<br>Conclusions<br>References<br>In-canopy turbulence - State of the art and potential improvements<br>Introduction<br>Current parameterisations of in-canopy turbulence<br>Disadvantages of current parameterisations<br />Ways to improve parameterisations of in-canopy turbulence<br>The development of a conceptual in-canopy turbulence model that can be integrated into a chemical transport model (CTM)<br>Conclusions<br>References<br>A common conceptual modelling framework for reactive trace gases and volatile aerosols atmosphere-biosphere exchange in chemical transport models<br>General model requirements<br>The ideal model for each compound<br>Ammonia<br>Nitrogen oxides and ozone<br>Aerosol and acid gases<br>Volatile organic compounds (VOC)<br>Emerging common features in the modelling framework<br>A new paradigm of bi-directional dynamic exchange<br>Model components<br>Model structure and modularity<br>Links with external drivers and models<br>A first basis for a common framework<br>Conclusions and key challenges<br />Acknowledgement body>