Measurements of PANs, OVOC, and Nitriles During INTEX-A H. Singh, D. Herlth, L. Salas, R. Kolyer, E. Czech 1 10 100 1000 0 2 4 6 8 10 12 Mixing ratio, ppt Altitude, km PPN TAN MEK C 2 H 5 OH C 2 H 5 CHO CH 3 OH (CH 3 ) 2 CO PAN CH 3 CHO CH 3 OOH CH 2 O 0 1000 2000 3000 4000 O x -organics Mixing ratio, ppt NMHC •Globally abundant •Photochemically active •Large poorly known sources •Measurement uncertainties
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Measurements of PANs, OVOC, and Nitriles During INTEX-A · 2005. 4. 18. · Measurements of PANs, OVOC, and Nitriles During INTEX-A H. Singh, D. Herlth, L. Salas, R. Kolyer, E. Czech
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Measurements of PANs, OVOC, and Nitriles During INTEX-A
H. Singh, D. Herlth, L. Salas, R. Kolyer, E. Czech
1 10 100 10000
2
4
6
8
10
12
Mixing ratio, ppt
Alti
tude
, km
PPN
TAN MEK
C2H
5OH
C2H
5CHO
CH3OH(CH
3)2CO
PAN
CH3CHO
CH3OOH
CH2O
0 1000 2000 3000 4000
�Ox-organics
Mixing ratio, ppt
�NMHC
•Globally abundant•Photochemically active•Large poorly known sources •Measurement uncertainties
• 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
• 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
• 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