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CH 4 TOTAL COLUMNS FROM SCIAMACHY – COMPARISON WITH ATMOSPHERIC MODELS

CH 4 TOTAL COLUMNS FROM SCIAMACHY – COMPARISON WITH ATMOSPHERIC MODELS. P. Bergamaschi 1 , C. Frankenberg 2 , J.F. Meirink 3 , M. Krol 1 , F. Dentener 1 , M. van Weele 3 ,T. Wagner 2 , U. Platt 2 , S. Koerner 4 , M. Heimann 4 ,.

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CH 4 TOTAL COLUMNS FROM SCIAMACHY – COMPARISON WITH ATMOSPHERIC MODELS

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  1. CH4 TOTAL COLUMNS FROM SCIAMACHY – COMPARISON WITH ATMOSPHERIC MODELS P. Bergamaschi1, C. Frankenberg2, J.F. Meirink3, M. Krol1, F. Dentener1, M. van Weele3,T. Wagner2, U. Platt2, S. Koerner4, M. Heimann4, 1European Commission Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy 2Institute for Environmental Physics, University of Heidelberg, Heidelberg, Germany 3Royal Netherlands Meteorological Institute (KNMI), De Bilt, Netherlands 4Max Planck Institute for Biogeochemistry, Jena, Germany ICDC7, Boulder, 26-30 September 2005

  2. SCIAMACHY absorption spectra of solar radiation (near-IR) -> high sensitivity also towards the surface Main challenge: Target precision / accuray ~ 1% ICDC7, Boulder, 26-30 September 2005

  3. SCIAMACHY - validation ground based FTIR (total column measurements) NDSC network - very few stations (~11) only; no coverage of tropical source regions - FTIR precision (~3%), accuracy (~7%) [Dils et al., 2005] comparison with other satellites currently no other CH4 retrievals available (except some exploratory retrievals from IMG/ADEOS (1997) alternative approach: inverse modelling using high precision / accuracy surface insitu / flask measurements (DCH4 ~ 0.1%) -> global 3D CH4 fields ICDC7, Boulder, 26-30 September 2005

  4. model - validation opposite view: validation of models (and bottom-up emission inventories) in particular over source regions which are not well sampled by the surface measurements Final objective: Better quantification of CH4 emissions ICDC7, Boulder, 26-30 September 2005

  5. TM5 model TM5 model – atmospheric zoom model • offline atmospheric transport model • meteo from ECMWF • global simulation 3o x 2o • zooming 1o x 1o (North America, South America, Europe, Africa, Asia, Australia) • http://www.phys.uu.nl/~tm5/ • [Krol et al., 2005] ICDC7, Boulder, 26-30 September 2005

  6. TM5 simulationsinversion based on groundbased monitoring sites synthesis inversion optimizing: - monthly emissions - 11 source categories - 7 global regions for wetlands - 5 global regions for biomass burning ground based background monitoring sites (NOAA/CMDL) ICDC7, Boulder, 26-30 September 2005

  7. TM5 inverse simulationsexamples for some monitoring sites 01 Jan 31 Dec simulation of global CH4 consistent with surface monitoring sites (background sites) ICDC7, Boulder, 26-30 September 2005

  8. SCIAMACHY vs. TM5 - global SCIA TM5 2003 average column averaged CH4 [ppb] ICDC7, Boulder, 26-30 September 2005

  9. SCIAMACHY vs. TM5 - global SCIA TM5 N-S gradient ~100 ppb consistent between SCIA and TM5 2003 average column averaged CH4 [ppb] ICDC7, Boulder, 26-30 September 2005

  10. SCIAMACHY vs. TM5 - global SCIA TM5 Enhanced CH4 over SouthEast Asia and tropical regions (S.America, Africa) 2003 average column averaged CH4 [ppb] ICDC7, Boulder, 26-30 September 2005

  11. SCIAMACHY vs. TM5 - Asia 04-06 2003 SCIA TM5 ICDC7, Boulder, 26-30 September 2005

  12. SCIAMACHY vs. TM5 - Asia 07-09 2003 SCIA TM5 ICDC7, Boulder, 26-30 September 2005

  13. SCIAMACHY vs. TM5 - Asia 10-12 2003 SCIA TM5 ICDC7, Boulder, 26-30 September 2005

  14. SCIAMACHY vs. TM5 - South America 01-03 2003 SCIA TM5 ICDC7, Boulder, 26-30 September 2005

  15. SCIAMACHY vs. TM5 - South America 04-06 2003 SCIA TM5 ICDC7, Boulder, 26-30 September 2005

  16. SCIAMACHY vs. TM5 - South America 07-09 2003 SCIA TM5 ICDC7, Boulder, 26-30 September 2005

  17. SCIAMACHY vs. TM5 - South America 10-12 2003 SCIA TM5 ICDC7, Boulder, 26-30 September 2005

  18. South America 01-03 2003 JK SCIA TM5 CH4 emission from wetlands: J. Kaplan [2005] spatial distribution of wetlands based on GLC2000 ICDC7, Boulder, 26-30 September 2005

  19. South America 01-03 2003 BW SCIA TM5 CH4 emission from wetlands: Walter et al. [2001] spatial distribution of wetlands based on [Matthews and Fung, 1987] ICDC7, Boulder, 26-30 September 2005

  20. SCIAMACHY vs. TM5: global std, bias daily SCIA retrievals vs. TM5 (global over land) std bias ICDC7, Boulder, 26-30 September 2005

  21. Conclusions • SCIAMACHY provides view on globalCH4 distribution • Enhanced CH4 over SouthEast Asia, and tropical regions of South America and Africa (DCH4 up to ~70 ppb) • Comparison with inverse simulations, optimized towards insitu observations: • Background regions: reference for validation of SCIAMACHY retrievals • Source regions: Different model scenarios yield significantly different CH4 distributions -> rather check of consistency than strict validation • major uncertainty: CH4 emissions from wetlands • overall std: 23.6 ppb (1.4%) - upper estimate of SCIA precision • potential (seasonal) bias (in particular over Australia (~20 ppb)) • average N-S gradient (~100 ppb) consistent between SCIAMACHY and TM5 ICDC7, Boulder, 26-30 September 2005

  22. Thank you ! ICDC7, Boulder, 26-30 September 2005

  23. Supporting Material ICDC7, Boulder, 26-30 September 2005

  24. SCIAMACHY / ENVISAT SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIAMACHY) altitude: 800 km 14 orbits per day full global coverage: every 6 days CH4: 1563-1585 nm CO2: 1631-1670 nm (O2: 760 nm) SCIAMACHY on ENVISAT ICDC7, Boulder, 26-30 September 2005

  25. SCIAMACHY VCD->VMR Conversion vertical column densities (V) [molec / cm2] -> column averaged mixing ratios (VMR) [ppb] use of CO2 instead of O2 for determination of total vertical column of dry air [Frankenberg et al., Science, 2005] -> very similar light path distribution (scattering) variability of total columns: DCO2 ~ 1/3 DCH4 CO2 VMR from TM3 column averaged CH4 mixing ratio [ppb] ICDC7, Boulder, 26-30 September 2005

  26. SCIAMACHY - averaging kernels [Frankenberg et al., 2005] ICDC7, Boulder, 26-30 September 2005

  27. SCIAMACHY vs. TM5 - global (incl. ocean) ICDC7, Boulder, 26-30 September 2005

  28. emission inventories for TM5 simulations bottom-up emission inventories used as priori emissions for inverse TM5 simulations: ICDC7, Boulder, 26-30 September 2005

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