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Atmospheric Environment Characterization in Support of the ESA ExoMars Mission Intercomparison LMD – SwRI models T. Bertrand, S. Rafkin, F. Forget, A.

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Presentation on theme: "Atmospheric Environment Characterization in Support of the ESA ExoMars Mission Intercomparison LMD – SwRI models T. Bertrand, S. Rafkin, F. Forget, A."— Presentation transcript:

1 Atmospheric Environment Characterization in Support of the ESA ExoMars Mission Intercomparison LMD – SwRI models T. Bertrand, S. Rafkin, F. Forget, A. Spiga, E. Millour

2 Project status November – start Phase 1 : LMD built 1D version for SWRI for radiative transfer synchronisation LMD sent reference profiles December First SWRI profiles received Solving reference time issues (bug, LTST vs LMST, UT versus LT) Investigation on surface temperature disagreement Problem of shortwave flow LMD found a bug in SWRI latitude Tuning the right options in both model (philosophy: LMD fit SWRI)

3 Project status January Comparison of 1D reference profiles with dust opacities at 0.2, 1, 5 LMD tries to match SWRI dust radiative effects and radiative models by tuning: 1.Dust opacity 2.Dust visible single scaterring albedo ("brightness of the dust") 3.Dust thermal infrared opacity vs visible opacity

4 Radiative transfer setting – 1D configuration Note : the radiative transfer model used by SWRI (NASA Ames) is known to underestimate dust heating rates. They partly compensate that by using "dark" dust radiative properties. 1D Run parameters – 6 cases:  Comparison LMD – SwRI without tunning  Comparison LMD – SwRI with tunning of dust properties

5 Comparison LMD – SwRI without tunning Surface flux SW

6 Comparison LMD – SwRI without tunning Surface flux LW

7 Comparison LMD – SwRI without tunning Surface temperature

8 Comparison LMD – SwRI without tunning Temperature profiles

9 Comparison LMD – SwRI without tunning Temperature profiles

10 Comparison LMD – SwRI without tunning Temperature profiles

11 Comparison LMD – SwRI without tunning Temperature profiles

12 Comparison LMD – SwRI without tunning Temperature profiles

13 Comparison LMD – SwRI without tunning Temperature profiles

14 Sensibility to dust opacity Temperature profiles

15 Sensibility to dust opacity Temperature profiles

16 Sensibility to dust opacity Temperature profiles

17 Sensibility to dust brightness Temperature profiles

18 Sensibility to dust brightness Temperature profiles

19 Sensibility to dust brightness Temperature profiles

20 Sensibility to ratio dust thermal IR vs VIS opacity Temperature profiles

21 Fitting C1 case with the three parameters Temperature profiles

22 BEST FITS – Case A1 Temperature profiles

23 BEST FITS – Case A1 Surface temperature

24 BEST FITS – Case B1 Temperature profiles

25 BEST FITS – Case B1 Surface temperature

26 BEST FITS – Case C1 Temperature profiles

27 BEST FITS – Case C1 Surface temperature

28 / Many plots available on: http://www.lmd.jussieu.fr/~tblmd/Intercomparison/1D_plots

29 Conclusion 1D comparisons are globally ok Turbulent diffusion scheme in the boundary layer: fundamental model differences that should be kept in the intercomparison ? Green light has been given to SwRI to start running GCM, Mesoscale and LES models.

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