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4D-VAR chemical data assimilation of ENVISAT chemical products (BASCOE): validation support issues

4D-VAR chemical data assimilation of ENVISAT chemical products (BASCOE): validation support issues. Authors: D. Fonteyn, S. Bonjean, S. Chabrillat, F. Daerden, Q. Errera BIRA-IASB bascoe.oma.be (soon).

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4D-VAR chemical data assimilation of ENVISAT chemical products (BASCOE): validation support issues

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  1. 4D-VAR chemical data assimilation of ENVISAT chemical products (BASCOE): validation support issues Authors: D. Fonteyn, S. Bonjean, S. Chabrillat, F. Daerden, Q. Errera BIRA-IASB bascoe.oma.be (soon)

  2. 4D-VAR chemical data assimilation of ENVISAT chemical products (BASCOE): validation support issues • BASCOE: v1.01 (57 species, psc, 5° × 5°, 37 vertical levels) • MIPAS NLE: O3, H2O • MIPAS NRT all chemical species: problems reading pds-files • ECMWF analysis • Background error covariance ›› observation error covariance • Spatial correlations

  3. BASCOE: qualitative comparison Groundstations: total column Effect of horizontal resolution

  4. Comparison with MIPAS_NLE observations: • Constraining observations • Non-constraining observations (5 %): independent non-biased observations, representativeness of MIPAS

  5. MIP_NLE O3 Constraining observations Non-constraining observations: not used in assimilation

  6. MIP_NLE H2O Constraining observations Non-constraining observations: not used in assimilation

  7. Time evolution co-located H2O BASCOE MIP_NLE and HALOE

  8. Time evolution co-located CH4 BASCOE MIP_NLE and HALOE

  9. Time evolution co-located HCl BASCOE MIP_NLE and HALOE

  10. Quantitative comparison:co-located means + std deviationBASCOE,l HALOE sunset sunrise sunrise

  11. Quantitative comparison HALOE – BASCOE MIP_NLE:co-located mean difference + std deviation sunrise sunrise sunset

  12. Quantitative comparison:co-located means + std deviationBASCOE,l HALOE

  13. Quantitative comparison HALOE – BASCOE MIP_NLE:co-located mean difference + std deviation

  14. NRT validation: Cloud top heightThanks to Univ Leicester

  15. Conclusions • Successful assimilation of MIP_NLE, representing MIPAS_NLE state • Ozone column compares well with groundstation observations • Quantitative comparison with HALOE: • Expectations of MIPAS recommendations: impatience • Cloud top height ! • Chlorine budget ! MIPAS potential • Ground segment ! Coverage! pds format!

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