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Globally abundant Photochemically active Large poorly known sources Measurement uncertainties

Measurements of PANs, OVOC, and Nitriles During INTEX-A H. Singh, D. Herlth, L. Salas, R. Kolyer, E. Czech. Globally abundant Photochemically active Large poorly known sources Measurement uncertainties. PANAK & Chemicals. •3 Channel capillary GC/ECD-PID-RGD - Chs 1 & 2/ECD: PANs

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Globally abundant Photochemically active Large poorly known sources Measurement uncertainties

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  1. Measurements of PANs, OVOC, and Nitriles During INTEX-AH. Singh, D. Herlth, L. Salas, R. Kolyer, E. Czech • Globally abundant • Photochemically active • Large poorly known sources • Measurement uncertainties

  2. PANAK & Chemicals • •3 Channel capillary GC/ECD-PID-RGD • - Chs 1 & 2/ECD: PANs • - Ch 3/PID-RGD: OVOC/Nitriles/HCs • • 200 ml cryo sampling/2-min; heated probe • • Sensitivity (ppt): PANs-1; OVOC- 5 to 20; HCN- 30 • • PAN every 2.5 min; OVOC every 5 min • (CH3)2CO • CH3COC2H5 • CH3OH • C2H5OH • CH3CHO • PAN • PPN • RONO2 • C2Cl4 • HCN • CH3CN • C6H6

  3. DC-8 PANAK Data Status • • Data collected on all missions • No RGD channel data on Mission 11 • Acetaldehyde data are only for Trop (O3<100 ppb) • Date above 35 K ft are less precise

  4. CH3CN & HCN HCN column = 5x1015 molec cm-2

  5. HCN Soil Sink?

  6. Acetone & MEK

  7. Methanol & Ethanol

  8. Biogenic Sources?

  9. Upper Tropospheric Influences

  10. PAN & SPAN

  11. Benzene/PID

  12. Acetaldehyde DC-8 P-3

  13. Ongoing Focus • Biogenic/anthropogenic emission sources of OVOC • Sources/sinks of HCN/CH3CN • Input from models • Further data and trajectory analysis • Reconciliation of measurements? • Manuscripts • Overview paper • Sources/sinks of OVOC/PAN/HCN • Role of OVOC in HOx/NOx chemistry

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