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![Page 1: Institute of Environmental Physics University of Bremen Retrieval of Tropospheric Water Vapour from FTIR Solar Absorption Measurements 1 Department of.](https://reader036.fdocuments.us/reader036/viewer/2022062518/56649e3a5503460f94b2c4b4/html5/thumbnails/1.jpg)
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
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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
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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
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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
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Observations onboard of Polarstern
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Polarstern campaign Oct./Nov. 1996
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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
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200
180
160
140
120
100
80
60
40
20
vmr (ppbv)
Dependancy of vmr-profile results on a-priori
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Sensitive to a-priori profile, Adhoc covariance
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Sensitive to a-priori profile, modified Tikhonov
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balloon sonde constant vmr
modified TikhonovAdhoc approach
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Spitsbergen, 79°N, 12°E
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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
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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
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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
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Summary and conclusions
total columns of H216O, H2
18O and HDO
profiles with 2-3 degrees of freedom
tropopause region difficult to reach
work in progress