1 / 17

Institute of Environmental Physics

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

noelani-jeremiah
Download Presentation

Institute of Environmental Physics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Retrieval of Tropospheric Water Vapour from FTIR Solar Absorption Measurements 1G. Mengistu Tsidu, 2J. Notholt, 2T. Warneke and 3O. Schrems 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 University of Bremen Institute of Environmental Physics

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

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

  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:H2160: 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, 2860.4H218O: 2900.4, 2942.55, 2954.95, 3000.45 Midlatitudes:H216O: 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, 2747.2H218O: 2955.0, 2976.2, 3001.0, 3023.6, 3043.6, 3091.0

  5. Observations onboard of Polarstern

  6. Polarstern campaign Oct./Nov. 1996

  7. Polarstern cruise Oct./Nov. 1996

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

  9. Sensitive to a-priori profile, Adhoc covariance

  10. Sensitive to a-priori profile, modified Tikhonov

  11. balloon sonde constant vmr modified Tikhonov Adhoc approach

  12. Spitsbergen, 79°N, 12°E

  13. Spitsbergen 2001

  14. Temperature dependance of d HDO

  15. Meteoric Water Line: δ HDO = 8 * δ H218O + 10

  16. Summary and conclusions  total columns of H216O, H218O and HDO  profiles with 2-3 degrees of freedom  tropopause region difficult to reach  work in progress

More Related