oh in the coastal boundary layer of crete: measurements and primary production rates during minos
DESCRIPTION
OH in the Coastal Boundary Layer of Crete: Measurements and Primary Production Rates During MINOS Harald Berresheim 1 , Christian Plass-Dülmer 1 , Thomas Elste 1 , and Nikos Mihalopoulos 2 1 German Weather Service, Meteorological Observatory Hohenpeissenberg, Albin- Schwaiger-Weg 10, Germany - PowerPoint PPT PresentationTRANSCRIPT
OH in the Coastal Boundary Layer of Crete: Measurements and Primary Production Rates During MINOS
Harald Berresheim1, Christian Plass-Dülmer1, Thomas Elste1, and Nikos Mihalopoulos2 1German Weather Service, Meteorological Observatory Hohenpeissenberg, Albin- Schwaiger-Weg 10, Germany 2University of Crete - Environmental Chemical Processes Laboratory (ECPL), Heraclion Greece
Location of Finokalia Station (35°19‘N, 25°40‘E; 100-130 m asl)
O(1D)H2O
O2,M
H
HCHO
CO
O(3P)
O3
H2O2H2O
OH
NOmehrereSchritte
mehrereSchritte
HO2
Regen
M
O2,M
H2
CxHy
hh
h
CO,CH4
CxHy = Hydrocarbons
HO2
RO2
NO, O2
Sources and Sinks of OH
ν
multiple steps
multiple steps
Rain
O3
Chemical Ionization Mass Spectrometer (CIMS) in Field Lab
CIMS Ionization ReactorMINOS 2001
Station Finokalia
Compounds Measured:
OH, H2SO4 (gas), MSA (gas)
Time Resolution: 30 sec Signal Integration: 5 min
Accuracy, Precision, Detection Limit (2σ) :
OH: 38 %, 32 %, 2.5 x 105 molec cm-3
H2SO4, MSA: 29%, 21 %, <
1 x 105 molec cm-3
MINOS / Finokalia Station: OH (5 min)
0
5
10
15
20
25
30
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
August 2001
Time-weighted Average , 106 cm-3 06-12 August: 4.0 ± 0.6 13-21 August: 5.3 ± 0.9 * Total Period: 4.7 ± 1.0 *
* excluding 19 August
MINOS / Finokalia Station: Wind
200
220
240
260
280
300
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
August 2001, UTC
0
5
10
15
20
25
Wind Direction
Wind Speed
MINOS / Finokalia Station: H2O, rH, and O3
0
2
4
6
8
10
12
14
16
18
20
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
August 2001, UTC
0
10
20
30
40
50
60
70
80
90
100H2ORel. Hum.Ozone
OH ]N[O
OH ]O[ D)J(O 2P(OH)
2O2H22N22
2 O2H3
O
1
kkk
k
Primary Production Rate, P(OH)
2Ok,
OH Primary Production
Ozone-Photolysis 330 nm
O3 + h O(1D) + O2
O(1D) + H2O 2 OH
O(1D) + N2, O2 O( 3P)
J(O1D)
O2Hk
2Nk
(1)
(2)
(3)
MINOS / Finokalia Station: OH and P(OH)
0
5
10
15
20
25
30
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
August 2001
0
1
2
3
4
5
6
7
8
9
10
11
12
OH
P(OH)
MINOS / Finokalia: OH vs. P(OH)Total Period (06 - 22 August, 2001)
y = 1.8359x
R2 = 0.8806
0
5
10
15
20
25
30
0 2 4 6 8 10 12
P(OH), 106 molecules cm-3 s-1
MINOS / Finokalia Station: OH and P(OH)
0
5
10
15
20
25
30
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
August 2001
0
1
2
3
4
5
6
7
8
9
10
11
12
OH
P(OH)
OH / P(OH)
R^2
MINOS / Finokalia Station: OH and P(OH)
0
5
10
15
20
25
30
03 06 09 12 15 18
Time of Day, UTC
0
1
2
3
4
5
6
7
8
9
10
11
12
OH
P(OH)
OH / P(OH)
11 Aug (JD 223)
0
50
100
150
200
250
300
03 06 09 12 15 18
11 Aug,Time of Day, UTC
CO
, p
pb
v
0
1
2
3
NO
2, p
pb
v
CO NO2
MINOS / Finokalia Station: OH and P(OH)
0
5
10
15
20
25
30
03 06 09 12 15 18
Time of Day, UTC
0
1
2
3
4
5
6
7
8
9
10
11
12
OH
P(OH)
OH / P(OH)
13 Aug (JD 225)
200
220
240
260
280
300
320
340
03 06 09 12 15 18
13 August 2001; Time of Day, UTC
0.00
0.05
0.10
0.15
0.20Wind Direction
NO
MINOS / Finokalia Station: H2O, rH, and O3
0
2
4
6
8
10
12
14
16
18
20
00 03 06 09 12 15 18
13 August 2001; Time of Day, UTC
0
10
20
30
40
50
60
70
80
90
100H2ORel. Hum.Ozone
MINOS / Finokalia Station: OH and P(OH)
0
5
10
15
20
25
30
03 06 09 12 15 18
Time of Day, UTC
0
1
2
3
4
5
6
7
8
9
10
11
12
OH
P(OH)
OH / P(OH)
14 Aug (JD 226)
MINOS / Finokalia Station: OH and P(OH)
0
5
10
15
20
25
30
03 06 09 12 15 18
Time of Day, UTC
0
1
2
3
4
5
6
7
8
9
10
11
12
OH
P(OH)
OH / P(OH)
17 Aug (JD 229)
Conclusions
• Mean OH concentration at Finokalia during MINOS:
4.7 x 106 molecules cm-3 (Spivakovsky et al., 2000: 2-3 x 106 cm-3, same region, July, 700 hPa;1.5 x 106 cm-3, 36°N zonal and monthly average, July, 1000 hPa)
• Primary production via ozone photolysis and reaction of O(1D) with H2O was the dominant source of OH (R2 = 0.8806)
• Fairly good agreement with present model calculations
of the regional OH balance during MINOS (e.g., poster by Baboukas et al., oral presentation by Lawrence et al., this session)
Acknowledgement
Our sincere thanks to:
Jos Lelieveld (MPI), Marian de Reus and the MINOS team, E. Baboukas, M. Lawrence, Pavlos Petsalakis, ECPL staff and students, and Georg Stange (DWD).