3-D Topographic Thermal and Radiative Modeling of Ice Stability and Migration on Callisto

Details 3-D Topographic Thermal and Radiative Modeling of Ice Stability and Migration on Callisto 3-D Topographic Thermal and Radiative Modeling of Ice Stability and Migration on Callisto

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.5405w&link_type=abstract

American Astronomical Society, DPS meeting #42, #54.05; Bulletin of the American Astronomical Society, Vol. 42, p.1075

Astronomy and Astrophysics

Astronomy

Scientific paper

We have been modeling landscape evolution on the Galilean satellites driven by volatile transport. Callisto's landscape shows evidence of widespread erosion hypothesized by Moore et al. (1999) to result from sublimation of near-surface ice followed by mass wasting. Bright material thought to be re-deposited frost is commonly seen on upper flanks and summits of ridges, crater rims, and Callisto's ubiquitous knobs. In order to test hypotheses related to these landform and albedo patterns, we have developed a 3-D thermal model that calculates surface and subsurface temperatures for any given topographic shape, accounting for shadowing, reflected solar radiation, and thermal radiation from surrounding points. The temperatures are then used to calculate sublimation and subsurface diffusion rates for both CO2 and H2O ice. These rates are used to compute area-averaged downward vapor fluxes within ballistic molecular jump distances from vapor sources. Where net deposition is predicted, surface albedo in increased proportional to frost thickness. Where net sublimation occurs, the thickness of a dark dust lag is increased accordingly. We will present results pertaining to the stability of bright frost-covered knobs as well as observed distribution patterns of frost on the interior walls of craters.
This work is supported by NASA through the Jupiter Data Analysis Program.

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