institute of environmental physics
DESCRIPTION
Retrieval of Tropospheric Water Vapour from FTIR Solar Absorption Measurements. 1 G. Mengistu Tsidu, 2 J. Notholt, 2 T. Warneke and 3 O. Schrems. 1 Department of Physics, Addis Ababa University, Addis Ababa, Ethiopia 2 Department of Physics, University of Bremen, Bremen, Germany - PowerPoint PPT PresentationTRANSCRIPT
Institute of Environmental Physics University of Bremen
Retrieval of Tropospheric Water Vapour from FTIR Solar Absorption Measurements
1 Department of Physics, Addis Ababa University, Addis Ababa, Ethiopia2 Department of Physics, University of Bremen, Bremen, Germany3 Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany
1G. Mengistu Tsidu, 2J. Notholt, 2T. Warneke and 3O. Schrems
Remote sensing of in the infrared using the Fourier Transform Infrared Spectroscopy (FTIR)
wavenumber (cm-1)
inte
nsi
ty (
arb.
Uni
ts)
wavelength (m) 13.0 10.0 8.0
8.725 8.720
wavenumber (cm-1)
wavelength (m)
tran
smis
sion
total columns (molec. cm-2) 20 trace gases
profiles (vmr)for 10 trace gases
Spectral lines
ALFIP: Automatic Line Finding Programhttp://www.iup.physik.uni-bremen.de/ftir/alfip
Automatic search for lines with highest signal contribution in defined altitude region
Tropics:H2
160: 2429.5, 2485.3, 2497.1, 2940.9, 3145.5, 3147.8, 3158.6HDO: 2660.3, 2672.2, 2675.0, 2725.5, 2737.8, 2747.3, 2854.5, 2860.4H2
18O: 2900.4, 2942.55, 2954.95, 3000.45
Midlatitudes:H2
16O: 2911.2, 2930.6, 3050.55, 3146.75, 3147.9, 3152.5, 3189.6HDO: 2657.1, 2660.4, 2671.9, 2722.5, 2730.5, 2737.8, 2747.2H2
18O: 2955.0, 2976.2, 3001.0, 3023.6, 3043.6, 3091.0
Oct/Nov 1996
0.0E+00
5.0E+22
1.0E+23
1.5E+23
2.0E+23
-60 -40 -20 0 20 40 60
latitude
H216
O
Oct/Nov 1996
-300
-250
-200
-150
-100
-50
0
-60 -40 -20 0 20 40 60
latitude
δH
DO
Oct/Nov 1996
0
5
10
15
20
25
30
-60 -40 -20 0 20 40 60
latitude
T s
urf
ac
e
Polarstern cruise
Oct./Nov. 1996
y = 1.321x + 2E+21
0
1E+22
2E+22
3E+22
4E+22
5E+22
6E+22
7E+22
0 1E+22 2E+22 3E+22 4E+22 5E+22
HDO
H216
O
Spitsbergen 2001
Temperature dependance
of HDO
y = 7.1384x - 332.98
R2 = 0.6729
-600
-500
-400
-300
-200
-100
0
-25 -20 -15 -10 -5 0 5 10
T surface
δ H
DO
y = 0.0317x - 1.224
R2 = 0.7484
-2.5
-2
-1.5
-1
-0.5
0
-25 -20 -15 -10 -5 0 5 10
T surface
δ H
DO
/ T
y = 0.0001x - 0.0045
R2 = 0.802
-0.01
-0.008
-0.006
-0.004
-0.002
0
-25 -20 -15 -10 -5 0 5 10
T surface
δ H
DO
/ T
2
y = 8.0229x + 8.9567
R2 = 0.9718
y = 1.4397x - 215.74
R2 = 0.3638
-600
-500
-400
-300
-200
-100
0
-200 -180 -160 -140 -120 -100 -80 -60 -40 -20 0
δ H218O
δ H
DO
Meteoric Water Line: δ HDO = 8 * δ H218O + 10
0
12
3
4
56
7
89
10
60 110 160 210 260
day of 2001
δ H
DO
/ δ
H218
OFTIR GNIP