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Analysis of Atmospheric Mercury Speciation at HEDO Station, Okinawa

Analysis of Atmospheric Mercury Speciation at HEDO Station, Okinawa. Beijing. Shanghai. Hong Kong. Anthropogenic Sources of Hg in 1995 Pacyna et al.- 2003 LRT Workshop. Hg 0 – Ton/yr. Hg(II) – Ton/yr. PHg – Ton/yr. Atmospheric Mercury Nomenclature.

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Analysis of Atmospheric Mercury Speciation at HEDO Station, Okinawa

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  1. Analysis of Atmospheric Mercury Speciation at HEDO Station, Okinawa Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  2. Beijing Shanghai Hong Kong Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  3. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  4. Anthropogenic Sources of Hg in 1995Pacyna et al.- 2003 LRT Workshop Hg0 – Ton/yr Hg(II) – Ton/yr PHg – Ton/yr Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  5. Atmospheric Mercury Nomenclature • Hg0 or GEM - Gaseous Elemental Mercury • PHg – Particulate Bound Hg (2.5 um) • RGM - Reactive Gaseous Mercury - HgCl2? Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  6. Instrument Description: Atmospheric Mercury Speciation Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  7. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  8. Measurement vs Model Hedo Mean Hg0 = 2.04 ng/m3 Hedo Max Hg0 = 5.47 ng/m3 Seignuer et al., 2004 ES&T 38:555 Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  9. Measurement vs Model Hedo Mean Hg0 = 2.04 ng/m3 Hedo Max Hg0 = 5.47 ng/m3 Dastoor and Larocque., 2004 Atmos. Env. 38:147 Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  10. Measurement vs Model Hedo RGM Mean = 4.51 pg/m3 Hedo RGM Max = 32.5 pg/ m3 Seignuer et al., 2004 ES&T 38:555 Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  11. Measurement vs Model Hedo PHg Mean = 3.05 pg/m3 Hedo PHg Max = 16.5 pg/ m3 Seignuer et al., 2004 ES&T 38:555 Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  12. Comparison of Model and Observation of Hg0Seignuer et al., 2004 ES&T 38:555 Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  13. Beijing - China Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  14. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  15. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  16. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  17. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  18. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  19. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  20. LOCAL? Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  21. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  22. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  23. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  24. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  25. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  26. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  27. High Hg0 and CO often begins with rainfall note also SO4 washout Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  28. Evidence for Biomass Signal?Organic Rich – Sulfate Low Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  29. Evidence for Biomass Signal?Organic Rich – Sulfate Low Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  30. NAAPS Forecast Smoke SO4 Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  31. No clear observation of a dust event Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  32. NAAPS Forecast – over predicts SO4 Dust Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  33. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  34. Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  35. Low-Level RGM and PHg Emissions results in faster local removal by Dry Deposition? < 50 Meter Total Hg Emissions (tons/yr) >150 Meter Total Hg Emissions (tons/yr) Pacyna et al.- 2003 LRT Workshop Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  36. Why are RGM values lower than models and uncorrelated with pollution compounds? Hypothesis – RGM from anthropogenic emissions are preferentially reduced to Hg0 via the complex chemistry of S02 > S03 > S04 during cloud droplet formation and evaporation Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  37. What controls [RGM] – Photochemistry? Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  38. Hg0 Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  39. Future Data Interpretation • More refined analysis of each event with respect to AMS and meteorology • Support hypothesis that SO3 is preferentially converting emitted Hg(II) to Hg0 during cloud water processing (formation/evaporation) • Rule out local impacts Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  40. Future: Need Hg Deposition Data! • Inventories coupled to models predict high deposition in NW Pacific due to RGM and PHg emissions • Measurements needed to confirm at HEDO and elsewhere • Should be event based – at least for intensive study periods • What Hg deposition data is currently being collected or published? Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

  41. Continuous Mercury Speciation at HEDO • Depending on support-level we can do complete Automated Hg speciation system – or only total gaseous Hg with select intensive studies Eric Prestbo Ph.D. (ericp@frontiergeosciences.com)

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