measurements of pans ovoc and nitriles during intex a h singh d herlth l salas r kolyer e czech n.
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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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measurements of pans ovoc and nitriles during intex a h singh d herlth l salas r kolyer e czech
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
panak chemicals
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
dc 8 panak data status
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
ch 3 cn hcn
CH3CN & HCN

HCN column

= 5x1015 molec cm-2

ongoing focus
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