Post on 14-Sep-2020
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
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
• 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
DC-8 PANAK Data Status
CH3CN & HCN
0
2
4
6
8
10
12
0 200 400 600
HCN (median)HCN (mean)
ALT
ITU
DE,
km
HCN, PPT
0
2
4
6
8
10
12
0 60 120 180 240 300
CH3CN (median)CH3CN (mean)
ALT
ITU
DE,
km
CH3CN, PPT
0
1000
2000
3000
0
500
1000
1500
5.5 104 6 10 4 6.5 104 7 104 7.5 104 8 10 4 8.5 104
HC
N, p
pt CH3CN
ppt
UTC
0
200
400
600
0
2
4
6
8
10
12
CO
, ppb
ALT, km
HCN column = 5x1015 molec cm-2
HCN Soil Sink?
0
2
4
6
8
10
12
0 200 400 600 800 1000
Alt,
km
HCN, ppt
Mission 5 (7/8)
Soil sink?
0
2
4
6
8
10
12
0 200 400 600 800 1000
HCN, ppt
Soil sink?
Mission 6 (7/12)
Acetone & MEK
0
2
4
6
8
10
12
0 50 100 150 200 250
MEK (median)MEK (mean)
ALT
ITU
DE,
km
MEK, PPT
0
2
4
6
8
10
12
0 1000 2000 3000 4000
Acetone (median)Acetone (mean)
ALT
ITU
DE,
km
Acetone, PPT
Methanol & Ethanol
0
2
4
6
8
10
12
0 100 200 300 400 500
Ethanol (median)Ethanol (mean)
ALT
ITU
DE,
km
Ethanol, PPT
0
2
4
6
8
10
12
0 1000 2000 3000 4000 5000
Methanol (median)Methanol (mean)
ALT
ITU
DE,
km
Methanol, PPT
Biogenic Sources?
0
2000
4000
6000
8000
1 104
0 100 200 300 400 500 600
Met
hano
l, pp
t
MEK, ppt
0
2000
4000
6000
8000
1 104
0 100 200 300 400 500 600
Ace
tone
, ppt
MEK, ppt
Upper Tropospheric Influences
0
100
200
300
400
500
0 200 400 600 800 1000
Ozo
ne, p
pt
PAN, ppt
UT 8-12 km
0
100
200
300
400
500
0 200 400 600 800 1000
MEK
, ppt
PAN, ppt
UT 8-12 km
0
2000
4000
6000
8000
1 104
0 200 400 600 800 1000
Ace
tone
, ppt
PAN, ppt
UT 8-12 km
0
2000
4000
6000
8000
1 104
0 200 400 600 800 1000
Met
hano
l, pp
t
PAN, ppt
UT 8-12 km
PAN & ΣPAN
0
500
1000
1500
0
2
4
6
8
10
12
4.5 104 5 104 5.5 104 6 104 6.5 104 7 104 7.5 104 8 104 8.5 104
PAN
/ΣPA
N, p
pt
UTC
M19
0
2
4
6
8
10
12
0 100 200 300 400 500
PAN (median)PAN (mean)
ALT
ITU
DE,
Km
PAN, PPT
Benzene/PID
0
50
100
150
200
250
300
0
2
4
6
8
10
12
4.5 104 5 104 5.5 104 6 104 6.5 104 7 104 7.5 104 8 104 8.5 104
benz
ene,
ppt ALTP
UTC
M19
0
2
4
6
8
10
12
0 30 60 90 120 150
Benzene (median)Benzene (mean)
ALT
ITU
DE,
km
Benzene, PPT
Acetaldehyde
0
2
4
6
8
10
12
0 100 200 300 400 500
Acetaldehyde (median)Acetaldehyde (mean)
ALT
ITU
DE,
km
Acetaldehyde, ppt
DC-8
P-3
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