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Page 1Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
AO 160 – OZVAL
Validation of ENVISAT ozone products through assimilation in the MSDOL model: First results obtained
with GOMOS
Authors: B. Théodore and the OZVAL team
Page 2Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Objectives
Data assimilation for ENVISAT stratospheric ozone measurements using the MSDOL model
Daily delivery of ozone profiles over selected stations at synoptic hours
Daily maps of assimilated ozone field at synoptic hours
Page 3Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Comparison of GOMOS profiles with assimilated SMR data
Page 4Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
MSDOL
CTM driven by analysed ECMWF wind fields
Resolution: 2.5°x2.5°, 36 pressure levels between 240 to 0.3 hPa (10 to 62 km)
33 chemical species computed, semi-lagrangian transport
Sequential assimilation of O3 profiles
Page 5Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Read Level2 products from their native format; Select useable data ; Convert concentrations to mixing ratios using
ECMWF temperature ; Compute matrix H : each selected point is located
on the model grid and the interplation coefficients are computed ;
Save these informations in a file (one file per profile).
Data pre-processing
Page 6Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Page 7Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Data selection: the good…
Page 8Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Data selection: the bad…
Page 9Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Data selection: the ugly !
Page 10Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
A first glance at the Southern hemisphere in September
Page 11Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Ozone field at 31.4 hPa on Sep. 24th
Page 12Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Difference between an analyse and the free running model
Page 13Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Sequence of ozone fields at 31.4 hPa
Page 14Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Page 15Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Comparison with an ozone sounding at Marambio (64.23°S, 56.72°W)
Page 16Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Comparison with Lidar profiles at Lauder (45.05°S, 169.68°E)
Page 17Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
An assimilation diagnostic: the quantity .
T -1v S v
Page 18Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
OmF vs.OmA
Page 19Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Time evolution of the OmF
Page 20Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Time evolution of the OmF/OmA
Page 21Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Assimilation with (better) data selection
Page 22Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Diagnostics
Page 23Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Time evolution of the OmF/OmA
Page 24Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Page 25Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Conclusions
GOMOS profiles exhibit large oscillations
Error bars in GOMOS products are unreliable
Careful data selection allows good assimilation results for ozone
Page 26Validation by Model Assimilation and/or satellite intercomparison - ESRIN 9-13 December 2002
Perspectives
assimilation of GOMOS data over upcoming validation campaigns
Assimilation of GOMOS “line densities” could help dealing with the “strong oscillations” problem
