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Institute of Environmental Physics University of Bremen Retrieval of Tropospheric Water Vapour from FTIR Solar Absorption Measurements 1 Department of.

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Presentation on theme: "Institute of Environmental Physics University of Bremen Retrieval of Tropospheric Water Vapour from FTIR Solar Absorption Measurements 1 Department of."— Presentation transcript:

1 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, Ethiopia 2 Department of Physics, University of Bremen, Bremen, Germany 3 Alfred-Wegener-Institute for Polar and Marine Research, Bremerhaven, Germany 1 G. Mengistu Tsidu, 2 J. Notholt, 2 T. Warneke and 3 O. Schrems

2 Remote sensing of in the infrared using the Fourier Transform Infrared Spectroscopy (FTIR) wavenumber (cm -1 ) intensity (arb. Units) wavelength (  m) 13.0 10.0 8.0

3 8.725 8.720 wavenumber (cm -1 ) wavelength (  m) transmission  total columns (molec. cm -2 ) 20 trace gases  profiles (vmr) for 10 trace gases

4 Spectral lines ALFIP: Automatic Line Finding Program http://www.iup.physik.uni-bremen.de/ftir/alfip Automatic search for lines with highest signal contribution in defined altitude region Tropics: H 2 16 0: 2429.5, 2485.3, 2497.1, 2940.9, 3145.5, 3147.8, 3158.6 HDO: 2660.3, 2672.2, 2675.0, 2725.5, 2737.8, 2747.3, 2854.5, 2860.4 H 2 18 O: 2900.4, 2942.55, 2954.95, 3000.45 Midlatitudes: H 2 16 O: 2911.2, 2930.6, 3050.55, 3146.75, 3147.9, 3152.5, 3189.6 HDO: 2657.1, 2660.4, 2671.9, 2722.5, 2730.5, 2737.8, 2747.2 H 2 18 O: 2955.0, 2976.2, 3001.0, 3023.6, 3043.6, 3091.0

5 Observations onboard of Polarstern

6 Polarstern campaign Oct./Nov. 1996

7

8 Polarstern cruise Oct./Nov. 1996

9 200 180 160 140 120 100 80 60 40 20 vmr (ppbv) Dependancy of vmr-profile results on a-priori

10 Sensitive to a-priori profile, Adhoc covariance

11 Sensitive to a-priori profile, modified Tikhonov

12 balloon sonde constant vmr modified Tikhonov Adhoc approach

13 Spitsbergen, 79°N, 12°E

14 Spitsbergen 2001

15 Temperature dependance of  HDO

16 Meteoric Water Line: δ HDO = 8 * δ H 2 18 O + 10

17 Summary and conclusions  total columns of H 2 16 O, H 2 18 O and HDO  profiles with 2-3 degrees of freedom  tropopause region difficult to reach  work in progress

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