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PRELIMINARY RESULTS from PIE 2005 the P AN I ntercomparison E xercise F. Flocke, G. Tyndall, E. Apel (NCAR) E. Willia

PRELIMINARY RESULTS from PIE 2005 the P AN I ntercomparison E xercise F. Flocke, G. Tyndall, E. Apel (NCAR) E. Williams (NOAA). PIE 2005. 6/28-7/8/2005 Enchanted Mesa eight different instruments from Canada, Germany, Japan, the UK, and the US five different methods

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PRELIMINARY RESULTS from PIE 2005 the P AN I ntercomparison E xercise F. Flocke, G. Tyndall, E. Apel (NCAR) E. Willia

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  1. PRELIMINARY RESULTSfromPIE 2005the PANIntercomparison ExerciseF. Flocke, G. Tyndall, E. Apel (NCAR)E. Williams (NOAA)

  2. PIE 2005 • 6/28-7/8/2005 • Enchanted Mesa • eight different instruments • from Canada, Germany, Japan, the UK, and the US • five different methods • ambient and standards measurements

  3. results arePRELIMINARY

  4. Instruments • Hiroshi Tanimoto, NIES, Japan; GC/MS • Graham Mills, UEA, UK, GC/ECD • Stefan Gilge, DWD, Germany, GC/ECD • Bernhard Rappenglueck and Rainer Schmitt, U. Houston and Metcon, Germany, GC/ECD • Jason O’Brien, Environment Canada, GC/PDD • Ron Cohen, Paul Wooldridge, Anne Perring, UCBerkeley, TD-LIF • Jim Roberts, NOAA, GC/ECD • Aaron Swanson, NCAR and Saewung Kim, GaTech, CIMS • (Frank Flocke, NCAR, Dual-GC/ECD)

  5. Other Instruments • Meteorological parameters (NOAA) • NO, NO2, O3 (NOAA) • NOy reference instrument in referee trailer (NCAR)

  6. Enchanted Mesa

  7. The forbidden zone Flow: 12~20 slpm standards ambient GC5 Internet Access, email

  8. Photo of site

  9. Photos of setup

  10. UEA GC/ECD • Restek MXT-200 Column • 0.53 ID, 10 m, 1.0µ film • 22 sccm • 17 ºC isothermal • cycle time 10 minutes • PAN, PPN

  11. Env. CAN GC/PDD • Restek MXT-200 Column • 0.53 ID, 8 m, 1.0µ film • 35 sccm • 15 ºC isothermal • cycle time 10 minutes • PAN, PPN

  12. NOAA GC/ECD • Restek Rtx-200 Column • 0.53 ID, 7.5 m, 1.0µ film • 10 sccm • 15 ºC isothermal • cycle time 5 minutes • PAN, PPN, APAN, MPAN, PiBN

  13. NIES GC/MS • DB-1 MS Column • 0.25 ID, 10 m, 0.25µ film • 2 sccm • cycle time 10 minutes • PAN, PPN, APAN, MPAN, PiBN, PnBN

  14. UH/Metcon GC/ECDDWD GC/ECD • DB1/DB-5 Column combination • 0.53 ID, ~10 m total • 20 sccm • ~15 ºC isothermal • PAN, PPN • cycle time 10 minutes • DWD GC has modified flow control (PAN only)

  15. UC Berkeley TD-LIF • measures NO2 by LIF • has 3 thermal decomposition stages held at ~150, 300 and 550 degrees decomposing all PANs, ANs, “NOy” into NO2 • cycle time 10 seconds • measures the sum of all PANs

  16. NCAR/GaTech CIGAR • measures PANs by CIMS • PAN, PPN, PBN, APAN, MPAN, PBzN, MoPAN, PPeN, ... • cycle time 2 seconds • scans should show additional PANs unless they are very sticky

  17. NCAR 2 Channel GC/ECD(“reference” instrument) • 2 RTX-200 Columns • 7.5m, 0.53 ID, 1.0µ film • 20 sccm • 20 ºC isothermal • cycle time 3 minutes • PAN, PPN, APAN, MPAN, PiBN

  18. Measurements • all measurements from common manifold • ambient air • PAN and PPN standards in dry zero-air from manifold • PAN and PPN standards in humidified zero air • i-Propyl nitrate (interferent) in zero-air

  19. PRELIMINARY

  20. Ambient Measurements

  21. 6/30/05 trace

  22. 6/30/05 trace

  23. 7/4/05 trace

  24. 7/4/05 trace

  25. All ambient data

  26. All ambient data

  27. All ambient data

  28. All ambient data

  29. i-Propyl nitrate

  30. PPN ambient

  31. PPN ambient

  32. PPN ambient

  33. Standards

  34. Standards

  35. Standards

  36. Standards

  37. Standards

  38. PRELIMINARY

  39. LIF and the sum of PANs

  40. 6/30 ambient trace

  41. 7/1 ambient trace

  42. 7/5 ambient trace

  43. Standard comparison with LIF

  44. Conclusions (for now) • very good agreement for ambient PAN measurements, considering it’s field data • acceptable agreement for ambient PPN measurements (might improve) • LIF measures consistently higher than sum of individual PANs (expected?) • extra PANs that GCs and CIMS miss? • no indication of LIF counting ANs as PANs • LIF NO2 background subtraction problem? • more work has to be done to produce final data and merge measurements together • compare MPAN, APAN, PBN

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