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UNECE/CLRTAP Task Force on Hemispheric Transport of Air Pollution

UNECE/CLRTAP Task Force on Hemispheric Transport of Air Pollution. Policy-Relevant Science Questions. André Zuber European Commission. 1. How does hemispheric transport affect air pollution ? What processes and which pollutants (ozone, Hg, POPs, PM …)?

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UNECE/CLRTAP Task Force on Hemispheric Transport of Air Pollution

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  1. UNECE/CLRTAP Task Force on Hemispheric Transport of Air Pollution Policy-Relevant Science Questions André Zuber European Commission

  2. 1. How does hemispheric transport affect air pollution ? • What processes and which pollutants (ozone, Hg, POPs, PM …)? • What evidence from observations and models? • What pathways by source region and season? • What processes need to better known? • How do processes on the hemispheric scale affect processes on the local and regional scale? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  3. 2.How much air pollution from one country or region to another? • What evidence from observations? • What source-receptor relationships from models? • What model resolution is needed? • How may models be nested from global to local scale? • What improvements of models are needed? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  4. 3.How much may air pollution change due to emission changes? • Are there simple relationships between emission changes and air pollution? • How may the source-receptor be infleunced by the resolution of the models? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  5. 4.How may the source-receptor relationships change over the next 20 to 50 years? • Projected emission changes over different regions? • How to construct air emission scenarios? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  6. 5.How may the source-receptor relationships change due to global change? • Changes of the atmosphere including climate change? • Significant feedbacks between air pollution and global change including climate change? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  7. 6.How confident are we of the results and what is our best estimate of the uncertainties? • What techniques for evaluation of models? • What observation data is needed to evaluate models to increase confidence? • What data is available to track long term changes? • Which processes need to better understood to the models? • What is our requirement of minimum level of certainty? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  8. 7.What efforts are needed to develop an integ-rated system of observation data and models? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  9. Task Force on Hemispheric Transport of Air Pollution: • What issues in TF HTAP? • Priorities and in what order? UNECE/CLRTAP TF HTAP Policy-Relevant Science Questions

  10. Thank you André Zuber European Commission

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