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Preliminary comparisons of GOMOS and MIPAS ozone products with Odin

Preliminary comparisons of GOMOS and MIPAS ozone products with Odin. AOID 760 Donal Murtagh, Ashley Jones, Patrick Eriksson, Carlos Jimenez Chalmers University of Technology Andreas Jonson Stockholm University + Odin Teams. Aims.

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Preliminary comparisons of GOMOS and MIPAS ozone products with Odin

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  1. Preliminary comparisons of GOMOS and MIPAS ozone products with Odin AOID 760 Donal Murtagh, Ashley Jones, Patrick Eriksson, Carlos Jimenez Chalmers University of Technology Andreas Jonson Stockholm University + Odin Teams

  2. Aims • To provide cross-validation of Odin and ENVISAT measurements of atmospheric constituent profiles. • To assess errors and biases in the data from different instruments • To help improve data products from both platforms

  3. Methodology • Assimilation of Envisat measurement data into the DIAMOND model during an extended period to ensure good model measurement agreement • Comparison with Odin and Sonde measurements obtained during the period. • Chosen period : 24/10/2002 to 06/11/2002 • Odin data available during 8 of the chosen days

  4. DIAMOND(Dynamical Isentropic Assimilation Model for OdiN Data) • Forecast model: • Transport scheme on isentropic surfaces • ECMWF winds • 100 km grid spacing • Assimilation scheme: • Statistical interpolation/ Optimal Estimation • analysis errors, model error growth • Observations for model evaluation: • UARS MLS O3 version 4 and Odin SMR data

  5. Setup for the Envisat Comparisons • DIAMOND model modified to use MJD as the time coordinate • Vertical coordinate 400 – 1000 K potential temp in steps of 50 K ( ~2 km) • Run for MIPAS ozone and N2O profile data for the period 24/10/2002 to 06/11/2002 = MJD 52569 – 52584 • Some runs have also been made for the GOMOS reference set but not reported on here due to lack of overlap with other measurements

  6. Composite plot Initial Model values against Mipas

  7. Composite plot Model against Mipas-O3 after 10 days assimilation

  8. Composite plot Model against Mipas–N2O after 10 days assimilation

  9. Comparison with Balloon sondes • Selected sondes during the assimilation period have been compared to the closest model point at the same time as the balloon ascent.

  10. Balloon Sonde Comparisons Ny Ålesund 30/10/2002 Payern 28/10/2002

  11. Odin Comparisons • Most comprehensive Ozone Validation for Odin products has been carried out for the Optical Limb scattering inversions using the Flittner Method (CvS)– Agreement with independent data is better than 10% on an individual profile basis • Comparisons of the 501GHz Sub-mm data have been carried out against the co-located Flittner profiles

  12. SMR 501 GHz Ozone vs Flittner

  13. MIPAS / Odin Ozone comparision

  14. MIPAS / Odin SMR 501GHz Ozone comparision

  15. MIPAS / Odin SMR 501GHz Ozone comparision

  16. MIPAS / Odin SMR 501GHz Ozone comparision

  17. MIPAS / Odin SMR 501GHz N2O comparision

  18. MIPAS/Odin N2O comparision

  19. MIPAS/Odin N2O comparision

  20. Conclusions and Future Work • MIPAS Ozone and N2O products seem to be in good agreement with Odin measurements and balloon sondes. • More work required to put this on a quantitative basis and to look for biases. • Model will be properly tuned for N2O and the spatial characteristics of the data sets • Monitoring mode will be introduced to allow direct comparison of assimilating data sets and independent data

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