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Intercomparisons of MIPAS and SCIAMACHY L1 and L2 Products with GOME and AATSR

Intercomparisons of MIPAS and SCIAMACHY L1 and L2 Products with GOME and AATSR. Authors: B.Kerridge, R.Siddans, J.Reburn, B.Latter and V.Jay (Remote-Sensing Group, Rutherford Appleton Laboratory, UK). Progress at RAL on Envisat Cal/Val Project AO1204

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Intercomparisons of MIPAS and SCIAMACHY L1 and L2 Products with GOME and AATSR

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  1. Intercomparisons of MIPAS and SCIAMACHY L1 and L2 Products with GOME and AATSR Authors: B.Kerridge, R.Siddans, J.Reburn, B.Latter and V.Jay (Remote-Sensing Group, Rutherford Appleton Laboratory, UK)

  2. Progress at RAL on Envisat Cal/Val Project AO1204 Preliminary MIPAS Intercomparisons: L1B in operational microwindows with calculations using ECMWF T, H2O & O3 L2 H2O and O3 with ECMWF and with RAL GOME O3 profiles Preliminary SCIAMACHY L1B Intercomparisons: Direct-sun spectrum with GOME Sun-normalised radiance spectra in uv/vis with GOME Spectrally-integrated sun-normalised radiances with AATSR 550, 670, 870nm & 1.6mm Outline

  3. Comparisons of MIPAS L1 with Calculated Spectra O3 MW1 24km Tangent-Height Orbit 2081 24/07/02 MIPAS L2 T, O3 & H2O ECMWF T, O3 & H2O

  4. H2O MW1 15km Tangent-Height Orbit 2081 24/07/02 MIPAS L2 T, O3 & H2O ECMWF T, O3 & H2O

  5. Comparisons of MIPAS L2 O3 & H2O ECMWF data for 24/07/02 interpolated to MIPAS L2 grid ECMWF H2O blended with climatology in stratosphere Individual profiles and orbit cross-sections compared Structures in cross-sections broadly similar in stratosphere O3 MIPAS generally higher than ECMWF in stratosphere (by 1-2 ppmv) MIPAS affected by PSCs near S.Pole in stratosphere MIPAS (too) high in equatorial upper troposphere (due to cloud) H2O MIPAS generally higher in stratosphere (~several ppmv) MIPAS (too) high near S.Pole in stratosphere (due to PSCs?)

  6. Comparison of MIPAS L2 O3 Orbit Cross-Section with ECMWF Orbit 2083 on 24/07/02

  7. Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWF Orbit 2083 on 24/07/02

  8. Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWF Orbit 2083 on 24/07/02

  9. Correction for GOME Scan-Mirror Degradation - Correction needed for GOME O3 profiles in 2002 to compare with Envisat - Empirical correction scheme devised from calculations assuming climatology - Update to ozonesonde statistical intercomparison in progress Time Time Wavelength (nm) Wavelength (nm) Wavelength (nm) Wavelength (nm)

  10. 24 July 2002 • MIPAS vs GOME O3 • (degradation corrected) Latitude (N) Latitude (N)

  11. Co • Comparisons of SCIAMACHY • L1 data with GOME in uv/vis • Solar irradiance spectrum • Sun-normalised radiances • Orbit 2509, 11th August 2002 • Different SZAs accounted for

  12. Comparison of Sun-Normalised Radiances in Band 1

  13. Comparison of Sun-Normalised Radiances in Bands 2-4

  14. Summary of Preliminary Findings MIPAS L1 Example L1 spectra consistent with calculations in O3 & H2O mw’s Registration of tangent-point pressures crucial, but difficult to assess MIPAS L2 O3 and H2O Stratospheric O3 and H2O x-sections quite consistent with ECMWF Stratospheric O3 consistent with GOME (10% for 20-36km at mid-lat); vertical structure smoother than anticipated cf GOME (vert res 4-6km) SCIAMACHY L1 Sun-normalised radiances significantly lower than GOME: ~10-25% in uv (Bands 1 & 2) ~5-20% in vis (Bands 3 & 4)

  15. Planned Further Work on MIPAS & SCIA Cal/Val Assess MIPAS L1 tangent-pressure registration Extend comparison of MIPAS L2 with GOME O3 profiles Comparisons of MIPAS L2 O3 & H2O with other schemes (AMIL2DA) Extend comparison of SCIA-nadir L1 with GOME Comparison of SCIA-nadir L1 with AATSR (cf ERS-2 GOME/ATSR-2) Assess SCIA radiometry cf AATSR 550, 670, 870nm and 1.6mm Assess SCIA pointing cf AATSR (1km x 1km) Comparison of SCIAMACHY L2 O3 profiles, when available, with O3 profiles retrieved by RAL scheme from: GOME SCIA-nadir (when improved L1B available).

  16. Supplementary Slides

  17. Comparison of MIPAS L2 O3 Orbit Cross-Section with ECMWF Orbit 2081 24/07/02

  18. Comparison of MIPAS L2 O3 Orbit Cross-Section with ECMWF Orbit 2082 on 24/07/02

  19. Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWF Orbit 2081 on 24/07/02

  20. Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWF Orbit 2081 on 24/07/02

  21. Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWF Orbit 2082 on 24/07/02

  22. Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWF Orbit 2082 on 24/07/02

  23. MIPAS retrievals from real data

  24. Comparisons of MIPAS L1 with Calculated Spectra O3 MW21 24km Tangent-Height Orbit 2081 24/07/02 MIPAS L2 T, O3 & H2O ECMWF T, O3 & H2O

  25. H2O MW1 21km Tangent-Height Orbit 2081 24/07/02 MIPAS L2 T, O3 & H2O ECMWF T, O3 & H2O

  26. Co

  27. Co

  28. Key-data

  29. Comparison of SCIA-nadir Sun-Normalised Radiances with AATSR • SCIA integrated spectrally over AATSR 550, 670, 870nm and 1.6mm filters • Spatial integration over scenes (480km (across) x 512km (along)) viewed in common on Orbit 2338 11/08/02

  30. Comparison in Bands 2-4 Ratio to simulation with albedo 0 Measurement

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