Answers to policy-relevant science questions - Hemispheric Transport of Air Pollution part D
2011
KEATING Terry | ZUBER André | DENTENER Franciscus | SEDDON Jessica | TRAVNIKOV Oleg | GUSEV Alexey | CARMICHAEL Greg | PARRISH David | GRANO Doug
Part D synthesizes the extensive HTAP reports part A (ozone and particles); part B (mercury); part C (POPS) focussing around 8 central questions: 1. What is the observational evidence for the intercontinental transport of O3, PM, Hg, and POPs in the Northern Hemisphere? 2. What are the main processes that drive these intercontinental flows and determine their magnitudes? 3. What do current models tell us about the contribution of intercontinental or global flows to concentrations and deposition in the different regions of the Northern Hemisphere and how changes in current emissions in one region affect air pollution concentrations or deposition in another region? 4. What is the contribution of these intercontinental or global flows to impacts on human health, natural and agricultural ecosystems, and near-term climate change? 5. How may the source-receptor relationships change over the next 20 to 40 years due to changes in emissions and climate change? 6. How well can we represent the processes that affect these intercontinental or global flows of air pollutants in quantitative models? 7. What efforts are needed to develop a system of observations, emissions, and models to better understand and track these flows? 8. What are the potential benefits of further international cooperation to address intercontinental transport of air pollution and how might this cooperation be structured?
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