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Satellite observations

Satellite observations. Christian Frankenberg, SRON, Utrecht Markus Woyde, IUP Heidelberg Ulrich Platt, IUP Heidelberg Cathy Clerbaux. Outline. Status report of SCIAMACHY methane retrievals Status report of IASI methane retrievals. SCIAMACHY retrievals .

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Satellite observations

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  1. Satellite observations Christian Frankenberg, SRON, Utrecht Markus Woyde, IUP Heidelberg Ulrich Platt, IUP Heidelberg Cathy Clerbaux

  2. Outline • Status report of SCIAMACHY methane retrievals • Status report of IASI methane retrievals First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  3. SCIAMACHY retrievals Important milestone in collaboration with Thorsten Warneke, IUP Bremen: Update of spectroscopic parameteres in the NIR spectral range

  4. The unknowns • Pressure broadening coefficients • Pressure line shift • Line intensities The solution • Use lab measurements done by Thorsten Warneke, IUP Bremen(FTS, OPD:90cm, 280cm cell with methane and N2 as foreign gas) • Measurements done at 900,500,250,125,20,5,1 hPa (@25 and -30Degree) • Use multispectrum fit to retrieve spectral parameters (ie, global fit using all lab spectra in one constrained least squares fit) First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  5. First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  6. First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  7. First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  8. First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  9. Conclusions 1 • Broadening seems to be lower than in HITRAN, especially at high J’s in the Q-branch. • Seasonal bias seems to be resolved, currently under investigation First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  10. SCIAMACHY retrievals Latest results after implementation of new spectroscopy and substantial changes to previous versions.

  11. SCIA 2 year tropospheric average First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  12. SCIA 2 year tropospheric average First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  13. SCIA 2 year tropospheric average First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  14. Time period of the Science paper, total column xVMR First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  15. First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  16. First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  17. Summary, SCIAMACHY • Methane retrievals substantially improved • Tropical regions lower than before (not „too“ low) • Averaging kernels for every ground pixel available • Data format is HDF5, conversion tools could be provided • Once SCIA/6.03 version from ESA is available, reprocessing starts and will yield higher coverage for 2003-2004 • SCIA spectra quality degrades at the end of 2005, retrieval noise up by a factor of 2, will be analyzed in more detail • 2 papers to be written asap... First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  18. ULB/Service d’Aéronomie CH4 from thermal infrared instruments Ariane Razavi, Cathy Clerbaux Image by ESA

  19. IMG – FTIR Comparisons Interferometric Monitor for Greenhouses gases, data from 1-10 April 1997 The few collocated measurements are compared with ground based stations profiles smoothed by the IMG averaging kernels. First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  20. IASI Lauch and status Timeline • Oct. 19, 2006 MetOp-A launch  Nov. 29, 2006 First spectra • May 24, 2007 L1C Operational dissemination (Eumetcast) •  October, 2007 L2 trial and operational dissimination (T, H20) Level 1 1 106/day = 15 Gb Infrared Atmospheric Sounding Interferometer First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  21. IASI - Spectral range • Extends from 645 to 2760 cm-1 • Resolution : 0.5 cm-1 • 2 regions where CH4 absorbs : around 1300 cm-1 near 2700 cm-1 Infrared Atmospheric Sounding Interferometer First HYMN annual meeting, Totnes, 21-23 Oct. 2007

  22. IASI – Influence of solar radiation • Day and night spectra differs at shortwave wavelengths (>2500 cm-1) due to solar radiation and scattering. • The additional inversion results, for some cases, in an improved sensitivity in the boundary layer. • And permits to reach 2 levels of vertical information (dofs). First HYMN annual meeting, Totnes, 21-23 Oct. 2007

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