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 transcript:

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

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

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

Spectral lines ALFIP: Automatic Line Finding Program Automatic search for lines with highest signal contribution in defined altitude region Tropics: H : , , , , , , HDO: , , , , , , , H 2 18 O: , , , Midlatitudes: H 2 16 O: , , , , , , HDO: , , , , , , H 2 18 O: , , , , ,

Observations onboard of Polarstern

Polarstern campaign Oct./Nov. 1996

Polarstern cruise Oct./Nov. 1996

vmr (ppbv) Dependancy of vmr-profile results on a-priori

Sensitive to a-priori profile, Adhoc covariance

Sensitive to a-priori profile, modified Tikhonov

balloon sonde constant vmr modified Tikhonov Adhoc approach

Spitsbergen, 79°N, 12°E

Spitsbergen 2001

Temperature dependance of  HDO

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

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