1. SCIAMACHY Validation Workshop, 6-8 Dec 2004, Bremen CO, CH4, CO2, and N2O columns retrieved from SCIAMACHY by WFM-DOAS: Algorithm, released data products, and initial validation/verification M. Buchwitz, R. de Beek, H. Bovensmann, J. P. Burrows (IUP/IFE-Bremen)

2. Data products released for validation WFM-DOAS data products: Vertical columns of CO, CH4, CO2, and N2O; Dry air column averaged mixing ratios (O2 normalized columns) XCH4, XCO2, and XN2O WFM-DOAS Version 0.4 finished in March 2004; processing of first large data set (~30 days of 2003); availability of first products announced on 17 March 2004 Initial validation results presented at 2nd ENVISAT Validation Workshop ACVE-2, May 2004, Frascati, ESA/ESRIN -> Details see references on next slide Processing of all consolidated orbits available for the year 2003; availability announced on 6 September 2004 (v0.4) Improved methane (v0.41) announced on 30 September 2004 Analysis ongoing...

3. Recent publications Atmospheric Chemistry and Physics (ACP/ACPD): Buchwitz, M., R. de Beek, K. Bramstedt, S. Noël, H. Bovensmann, and J. P. Burrows, Global carbon monoxide as retrieved from SCIAMACHY by WFM-DOAS, ACP, 4, 1945-1960, 2004 Buchwitz, M., R. de Beek, J. P. Burrows, H. Bovensmann, T. Warneke, J. Notholt, J. F. Meirink, A. P. H. Goede, P. Bergamaschi, S. Körner, M. Heimann, J.-F. Muller, and A. Schulz, Atmospheric methane and carbon dioxide from SCIAMACHY satellite data: Initial comparison with chemistry and transport models, ACPD, 2004 Warneke, T., de Beek, R., Buchwitz, M., et al., O., Shipborne solar absorption measurements of CO2, CH4, N2O, and CO and comparison the SCIAMACHY WFM-DOAS retrievals, ACPD (submitted), 2004 Sussmann, R., and Buchwitz, M., Validation of ENVISAT/SCIAMACHY columnar CO by FTIR profile retrievals at the ground truthing station Zugspitze, ACPD (submitted), 2004 ENVISAT validation workshop ACVE-2 (May 2004, Frascati): de Maziere, M., Barret, B., Blumenstock, T., Buchwitz, M., de Beek, R., et al., Comparison between SCIAMACHY scientific products and ground-based FTIR data for total columns of CO, CH 4, and N 2 O, proceedings ACVE-2 (ESA Special Publication), ESA/ESRIN, Frascati, Italy, 3-7 May 2004, 2004 Gloudemans, A. M. S., Schrijver, H., Straume, A. G., Aben, I., Maurellis, A. N., Buchwitz, M., de Beek, R., et al., CH 4 and CO total columns from SCIAMACHY: Comparisons with TM3 and MOPITT, proceedings ACVE-2 (ESA Special Publication), ESA/ESRIN, Frascati, Italy, 3-7 May 2004, 2004 ENVISAT Symposium (Sept. 2004, Salzburg): Buchwitz, M., R. de Beek, S. Noël, H. Bovensmann, and J. P. Burrows, Retrieval of CO, H 2 O, CH 4, CO 2, ans N 2 O columns from SCIAMACHY/ENVISAT by WFM-DOAS: Current status, ESA Special Publication SP-572, 2004.

4. WFM-DOAS algorithm

5. SCIAMACHY nadir spectrum & fitting windows CH4, N2OCO O2 CO2

6. Carbon monoxide from SCIAMACHY Carbon monoxide (CO)

7. CO: Single overpass Mozambique: CO plumes from fires Fires due to biomass burning in Africa Oct 2003 Buchwitz et al., ACP, 2004

8. CO: Single overpass II Buchwitz et al., ACP, 2004

9. CO averaging kernels: SCIAMACHY and MOPITT Emmons et al., JGR, 2004 MOPITT SCIAMACHY Buchwitz et al., ACP, 2004

10. CO: Seasonal averages

11. CO: Monthly means compared with MOPITT MOPITT data: H. Bremer, IUP-Bremen

12. CO: Monthly means compared with MOPITT II ATSR Fire Atlas Fires Portugal Aug 2003 MOPITT data: H. Bremer, IUP-Bremen

13. Methane from SCIAMACHY Methane (CH4)

14. Methane v0.4: Comparison with models Day 2003 IHD SCIA [ppbv] IHD model [ppbv] Mean difference SCIA – model [ppbv] Standard Deviation [ppbv] Jan 245356+10 (+0.6%)97 (5.6%) Mar 283048-186 (-10.6%)89 (5.1%) May 3011056+48 (+2.7%)200 (11.3%) Jul 233163-266 (-15.1%)122 (6.8%) TM5 data: P. Bergamaschi, JRC, Ispra

15. Methane v0.4: Bias analysis/correction Gives daily correction factor based on SOST throughput analysis

16. Methane v0.41 1st order bias corrected XCH4 monthly averages: v0.4: XCH4= CH4col/(O2col/0.2095) v0.41: XCH4= XCH4v0.4/(XCO2v0.4/370) Normalization by CO2, see also results from C. Frankenberg, IUP/Heidelberg WFM-DOAS v0.4 retrieval errors (in percent) Buchwitz and Burrows, SPIE, 2004

17. Methane v0.41: Comparison with KNMI/TM3 model 7%

18. Methane v0.41: Comparison with JRC/TM5 model Courtesy: P. Bergamaschi, JRC, Ispra Correlation SCIA/WFMD CH4 v0.41 with JRC/TM5 Bias [ppbv] 0% ~5%

19. Carbon dioxide from SCIAMACHY Carbon dioxide (CO2)

20. CO2 v0.4: Comparison with TM3/MPI-BGC model Buchwitz et al., ACPD, 2004 TM3 data: S. Körner, MPI-BGC, Jena

21. CO2 v0.4: Comparison with TM3 /MPI-BGC model II Buchwitz et al., ACPD, 2004 TM3 data: S. Körner, MPI-BGC, Jena

22. CO2 v0.4: Comparison with TM3 /MPI-BGC model III XCO2-offset MPI-Jena 8 ppm 25 ppm (7%) May 03 Jul 03 Sep 03

23. Summary Horizontal resolution [km x km] Estimated Precision (scatter) Estimated Accuracy (bias) CO30 x 12010 - 20%10 - 30% CH 4 30 x 1201- 6%2 - 15% (v0.41: <5%) CO 2 30 x 601 - 4%2 - 5% N2ON2O30 x 12010 – 20%30% Preliminary precision and accuracy estimates *) WFM-DOAS Version 0.4 column retrieval *) Status ACVE-2 (May 2004) For measurements over land; based on a limited number of data (several days of the year 2003) Details see: Buchwitz et al., Envisat Sym., 2004, and references given therein

24. Acknowledgements This work has been funded by: BMBF via GSF and DLR-Bonn, the European Commission (5th Framework project EVERGREEN) and the State and the University of Bremen