Category:Atmospheric Properties

Adjusting KRC's atmospheric Parameters

Several of KRC's default atmospheric parameters might not be optimized for most users:

TAURAT: Ratio of thermal to visible opacity of dust

DUSTA: Single scattering albedo of dust

ARC2: Henyey-Greenstein asymmetry factor

KRC assumes broadband atmospheric opacities, but the default values are given a specific wavelengths.

1. VIS/9μm dust opacity ratio is ~2:1 (M. Smith personal communication);

2. 9μm to broadband TIR ratio is 2.5:1 (ratio of maximum and average values of the dust opacity spectrum from Bandfield and Smith, [2003], Figure 3);

Then:

 TAURAT ≈ 0.22 (J. Bandfield personnal communication).

Values for DUSTA and ARC2 go together, and should not be changed without the other (see the table below). To stick with J. Bandfield’s values, a user can work with:

 DUSTA = 0.90

 ARC2 = 0.50

Other values are acceptable, except for “KRC Default” (see Table below)

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References

Bandfield, J. L., and M. D. Smith (2003), Multiple emission angle surface-atmosphere separations of Thermal Emission Spectrometer data, Icarus, 161, 47-65.

Kieffer, H. H. (2013), Thermal model for analysis of Mars infrared mapping, Journal of Geophysical Research: Planets, 118(3), 451-470.

Shaw, A., M. J. Wolff, F. P. Seelos, S. M. Wiseman, and S. Cull (2013), Surface scattering properties at the Opportunity Mars rover's traverse region measured by CRISM, Journal of Geophysical Research-Planets, 118(8), 1699-1717, doi:10.1002/jgre.20119.