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Validation of ENVISAT Products using POAM III O 3 , NO 2 , H 2 O and O 2 profiles. Authors: F. GOUTAIL, A. BAZUREAU. Description of POAM instrument Constituents measured List of profiles available Example of Profiles Comparison with GOMOS Conclusion.

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Validation of ENVISAT Products using POAM III O3, NO2, H2O and O2 profiles

Authors: F. GOUTAIL, A. BAZUREAU

  • Description of POAM instrument
  • Constituents measured
  • List of profiles available
  • Example of Profiles
  • Comparison with GOMOS
  • Conclusion

Acknowledgements : R. Bevilacqua and NRL POAM III Science Team

description of poam iii instrument
Description of POAM III Instrument

Launched on SPOT 4 satellite (CNES) on March 1998

Heliosynchronous quasi-polar orbit : HN (sunrise) – HS (sunset)

14 profiles/ day in each hemisphere (at the same latitude)

Between 54 – 71 °N

Between 62 - 87 °S

Solar occultation technique in UV- visible band

Vertical profiles of O3, NO2, H2O, O2

Vertical resolution

1 km for O3

1.5 to 2.5 km for NO2

HN

varying with season

HS

list of profiles available
List of profiles available
  • Since July 2002
  • Monthly “package” for each hemisphere
  • from July to November 2002.
  • Profiles of O3, NO2, H2O, O2 and aerosol extinction coefficient at 1018 nm
  • Profiles of Pressure and Temperature from NMC analysis
  • Very soon : December POAM III profiles
  • Future developments : all aerosol extinction coefficient profiles and …
  • all errors bars (for all constituents)
  • - POAM III HDF data Version 2 -
comparisons with gomos southern hemisphere july 2002
Comparisons with GOMOS : Southern Hemisphere - July 2002

Coincidence criterions :

time < 24 hours

distances < 800 km

20 “matches” found :

13 25Eta Tau (2.8)

7 87Alp Tau (0.8)

comparisons with gomos southern hemisphere july 20021
Comparisons with GOMOS : Southern Hemisphere - July 2002

Pressure and temperature profiles : NMC analysis versus ECMWF

Analysis conducted for each star

comparisons with gomos northern hemisphere september 2002 on work
Comparisons with GOMOS : Northern Hemisphere - September 2002on work

Coincidence criterions :

time < 24 hours

distances < 800 km

47 “matches” found

49Del Cap (2.8)

20 distances GOMOS / POAM III

< 400 km

comparisons with gomos northern hemisphere september 2002
Comparisons with GOMOS : Northern Hemisphere - September 2002

Pressure and temperature profiles : NMC analysis versus ECMWF model

comparisons with gomos northern hemisphere september 20021
Comparisons with GOMOS : Northern Hemisphere - September 2002

Constituents profiles comparisons :

comparisons poam iii gomos summary
Comparisons POAM III / GOMOS : SUMMARY

Comparisons of pressure and temperature relative difference profiles for each star :

conclusions
Conclusions
  • Comparison and validation programs are now ready for ENVISAT instruments validation
  • Reading PDS format programs not yet well mastered (several problems with Enviview)
  • Extraction of ENVISAT instrument profiles still hard working …
      • Waiting for GOMOS aerosol extinction coefficients profiles
      • Waiting for newGOMOS processing for O3, O2, NO2, H2O
      • MIPAS profiles coincident with POAM III available ?
      • First SCIAMACHY profiles are waited in January 2003