intercomparisons of mipas and sciamachy l1 and l2 products with gome and aatsr
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Page 1Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
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)
Page 2Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Outline
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 & 1.6m
Page 3Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
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
Page 4Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
H2O MW1 15km Tangent-Height Orbit 2081 24/07/02
MIPAS L2 T, O3 & H2O ECMWF T, O3 & H2O
Page 5Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
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?)
Page 6Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 O3 Orbit Cross-Section with ECMWFOrbit 2083 on 24/07/02
Page 7Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWFOrbit 2083 on 24/07/02
Page 8Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWFOrbit 2083 on 24/07/02
Page 9Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Wavelength (nm)
Tim
e
Wavelength (nm)
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
Wavelength (nm)
Tim
e
Wavelength (nm)
Page 10Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
24 July 2002
MIPAS vs GOME O3
(degradation corrected)
Latitude (N) Latitude (N)
Page 11Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
CoComparisons of SCIAMACHY
L1 data with GOME in uv/vis
1. Solar irradiance spectrum2. Sun-normalised radiances
Orbit 2509, 11th August 2002
Different SZAs accounted for
Page 12Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of Sun-Normalised Radiances in Band 1
Page 13Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of Sun-Normalised Radiances in Bands 2-4
Page 14Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Summary of Preliminary FindingsMIPAS 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)
Page 15Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Planned Further Work on MIPAS & SCIA Cal/Val
1. Assess MIPAS L1 tangent-pressure registration2. Extend comparison of MIPAS L2 with GOME O3 profiles
3. Comparisons of MIPAS L2 O3 & H2O with other schemes (AMIL2DA)
4. Extend comparison of SCIA-nadir L1 with GOME5. 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)6. Comparison of SCIAMACHY L2 O3 profiles, when available, with O3
profiles retrieved by RAL scheme from: GOME SCIA-nadir (when improved L1B available).
Page 16Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Supplementary Slides
Page 17Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 O3 Orbit Cross-Section with ECMWFOrbit 2081 24/07/02
Page 18Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 O3 Orbit Cross-Section with ECMWFOrbit 2082 on 24/07/02
Page 19Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWFOrbit 2081 on 24/07/02
Page 20Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWFOrbit 2081 on 24/07/02
Page 21Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWFOrbit 2082 on 24/07/02
Page 22Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of MIPAS L2 H2O Orbit Cross-Section with ECMWFOrbit 2082 on 24/07/02
Page 23Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
MIPAS retrievals from real data
Page 24Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
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
Page 25Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
H2O MW1 21km Tangent-Height Orbit 2081 24/07/02
MIPAS L2 T, O3 & H2O ECMWF T, O3 & H2O
Page 26Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Co
Page 27Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Co
Key-data
Page 29Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison of SCIA-nadir Sun-Normalised Radiances with AATSR- SCIA integrated spectrally over AATSR 550, 670, 870nm and 1.6m filters- Spatial integration over scenes (480km (across) x 512km (along)) viewed in common on Orbit 2338 11/08/02
Page 30Validation by Model Assimilation and/or Satellite Intercomparison - ESRIN 9–13 December 2002
Comparison in Bands 2-4Measurement Ratio to simulation with albedo 0