4-azimuth MAX-DOAS measurements in Mainz Characterisation of the information content using 3D RTM
MAXDOAS horizontal (averaging) effects
MPI for Chemistry (MPIC), Mainz, Germany
T. Wagner, J. Remmers, S. Beirle
Master Thesis, Julia Remmers
Comparison of the Telescopes (5°)NO2 DSCDs
Gradient plots (1)
• Measurement for the horizontal variability• Possibility to detect sources
N
S
W E
Gradient plots (2) NO2 DSCDs
Gradient plots (3)
3D, spherical Monte Carlo RTM
MCARTIM, Tim Deutschmann
- 1D, 2D, 3D Box AMF
Visualisation of a Monte-Carlo radiative transfer simulation (yellow: surface reflection, red: Rayleigh scattering, green: particle scattering)
Box AMF 0-1km, 500nm, no aerosols
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 1°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, no aerosols
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 1°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, aerosols 1-1km, OD 0.5
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 1°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, no aerosols
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 1°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, no aerosols
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 2°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, no aerosols
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 5°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, no aerosols
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 10°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, no aerosols
10 km
5 km
0 km-200 km 0 km 200 km
MAX-DOASelevation: 30°
horizontal grid: 8 km x 8km vertical grid: 100m
SZA: 70°
Box AMF 0-1km, 360nm, no aerosols
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
MAX-DOAS
elevation: 1°
Box AMF 0-1km, 360nm, no aerosols
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
MAX-DOAS
elevation: 1°
Box AMF 0-1km, 360nm, no aerosols
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
MAX-DOAS
elevation: 1°
Box AMF 0-1km, 500nm, no aerosols
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
elevation: 1°
Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.1
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
elevation: 1°
Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.2
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
elevation: 1°
Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.3
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
elevation: 1°
Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 0.5
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
elevation: 1°
Box AMF 0-1km, 500nm, aerosols: 0-1km, OD 1
50 km
0 km
-50 km-50 km 0 km 50 km
horizontal grid: 2km x 2km
SCIA: 30 km x 60 km
elevation: 1°
Conclusions
• Horizontal gradients can be determined from 4-azimuth MAX-DOAS observations
=> information on location of sources
• 3D-distribution of the sensitivity of MAX-DOAS depends strongly on wavelength and aerosol load
• horizontal area with box-AMF > 1 ranges typically from ~3 km to ~30 km
• spatial resolution of future satellite instruments maches that of MAX-DOAS observations (or is even finer)
6/24/09 04:48 6/24/09 09:36 6/24/09 14:24 6/24/09 19:12
Tim e
1E+5
1E+6
1E+7 R
adia
nce
[cou
nts/
sec]
0.0
0.2
0.4
0.6
CI
(rat
io 3
20/4
40)
0.0E+0
1.0E+3
2.0E+3
3.0E+3
O
4 D
SC
D
[1e4
0]
Cabauw, 24.06.2009
6/21/09 04:48 6/21/09 09:36 6/21/09 14:24 6/21/09 19:12
Tim e
1E+5
1E+6
1E+7 R
adia
nce
[cou
nts/
sec]
0.0
0.2
0.4
0.6
CI
(rat
io 3
20/4
40)
0.0E+0
1.0E+3
2.0E+3
3.0E+3
O
4 D
SC
D
[1e4
0]
Cabauw, 21.06.2009
7/7/09 04:48 7/7/09 09:36 7/7/09 14:24 7/7/09 19:12
Tim e
1E+5
1E+6
1E+7
Rad
ianc
e [c
ount
s/se
c]
0.0
0.2
0.4
0.6
CI
(rat
io 3
20/4
40)
0.0E+0
1.0E+3
2.0E+3
3.0E+3
O
4 D
SC
D
[1e4
0]
Cabauw, 07.07.2009
-1
0
1
2
3
4
4:00 8:00 12:00 16:00Time
O4 D
AM
F
O4_AMFO4_AMF_normO4_diff
O4 DAMFO4 DAMF clear dayDifference
-2
0
2
4
4:00 8:00 12:00 16:00Time
Ra
dia
nce
[arb
itra
ry u
nits
]
-100%
0%
100%
200%
Re
lativ
e d
iffe
ren
ce .
Rad_2Rad_norm_2Rad_ratio
RadianceRadiance clear dayrelative Difference
MODIS, 12 September 9:54MODIS, 12 September 9:54
-1
0
1
2
3
4
4:00 8:00 12:00 16:00Time
O4
DA
MF
O4_AMFO4_AMF_normO4_diff
O4 DAMFO4 DAMF clear dayDifference
-2
0
2
4
4:00 8:00 12:00 16:00Time
Ra
dia
nce
[arb
itra
ry u
nits
]
-100%
0%
100%
200%
Re
lativ
e d
iffe
ren
ce .
Rad_2Rad_norm_2Rad_ratio
RadianceRadiance clear dayrelative Difference
MODIS, 09 September 11:01MODIS, 09 September 11:01