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Organization of Course

Dive into an in-depth course covering emissions inventories, source-receptor analysis, post-processing, and source attribution for deposition modeling. Explore examples, theories, and collaboration opportunities in this detailed program.

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Organization of Course

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  1. Organization of Course Overall Project Issues & Examples Emissions Inventories Source-Receptor Post-Processing Source-Attribution for Deposition Model Evaluation Model Intercomparison Collaboration Possibilities INTRODUCTION Course overview Air Toxics overview HYSPLIT overview HYSPLIT Theory and Practice Meteorology Back Trajectories Concentrations / Deposition HYSPLIT-SV for semivolatiles (e.g, PCDD/F) HYSPLIT-HG for mercury

  2. Impact of source 4 estimated from weighted average of impacts of nearby explicitly modeled sources 4 Spatial interpolation Impacts from Sources 1-3 are Explicitly Modeled 1 RECEPTOR 2 3 2

  3. Congener Interpolation Used in Dioxin Modeling 2,3,4,7,8 PeCDF 2,3,7,8 TCDD 2,3,7,8 TCDF OCDD Only Four Congeners Actually Modeled: 2,3,7,8 TCDF 2,3,7,8-TCDD 2,3,4,7,8-PeCDF and OCDD All the rest estimated from the results for these

  4. Perform separate simulations at each location for emissions of pure Hg(0), Hg(II) and Hg(p) • [after emission, simulate transformations between Hg forms] • Impact of emissions mixture taken as a linear combination of impacts of pure component runs on any given receptor 5

  5. RECEPTOR Source “Chemical Interpolation” 0.3 x Impact of Source Emitting Pure Hg(0) + Impact of Source Emitting 30% Hg(0) 50% Hg(II) 20% Hg(p) = 0.5 x Impact of Source Emitting Pure Hg(II) + 0.2 x Impact of Source Emitting Pure Hg(p) 6

  6. Why might the atmospheric fate of mercury emissions be essentially linearly independent? • Hg is present at extremely trace levels in the atmosphere • Hg won’t affect meteorology (can simulate meteorology independently, and provide results to drive model) • Most species that complex or react with Hg are generally present at much higher concentrations than Hg • Other species (e.g. OH) generally react with many other compounds than Hg, so while present in trace quantities, their concentrations cannot be strongly influenced by Hg • Wet and dry deposition processes are generally 1st order with respect to Hg • The current “consensus” chemical mechanism (equilibrium + reactions) does not contain any equations that are not 1st order in Hg 7

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