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 transcript:

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

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)

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

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

Comparison LMD – SwRI without tunning Surface flux SW

Comparison LMD – SwRI without tunning Surface flux LW

Comparison LMD – SwRI without tunning Surface temperature

Comparison LMD – SwRI without tunning Temperature profiles

Comparison LMD – SwRI without tunning Temperature profiles

Comparison LMD – SwRI without tunning Temperature profiles

Comparison LMD – SwRI without tunning Temperature profiles

Comparison LMD – SwRI without tunning Temperature profiles

Comparison LMD – SwRI without tunning Temperature profiles

Sensibility to dust opacity Temperature profiles

Sensibility to dust opacity Temperature profiles

Sensibility to dust opacity Temperature profiles

Sensibility to dust brightness Temperature profiles

Sensibility to dust brightness Temperature profiles

Sensibility to dust brightness Temperature profiles

Sensibility to ratio dust thermal IR vs VIS opacity Temperature profiles

Fitting C1 case with the three parameters Temperature profiles

BEST FITS – Case A1 Temperature profiles

BEST FITS – Case A1 Surface temperature

BEST FITS – Case B1 Temperature profiles

BEST FITS – Case B1 Surface temperature

BEST FITS – Case C1 Temperature profiles

BEST FITS – Case C1 Surface temperature

/ Many plots available on:

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.