1. Simulating Radiative Heat Transfer in Multi‐Scattering Irregular Surfaces: Application to Snow and Ice Morphologies on Europa.
- Author
-
Carreon, Anthony, Macias, Antonio, Hsu, Andy, Berisford, Daniel F., Goldstein, David B., Varghese, Philip, Trafton, Laurence, Hand, Kevin P., Steckloff, Jordan, and Mahieux, Arnaud
- Subjects
HEAT radiation & absorption ,ALBEDO ,EUROPA (Satellite) ,SUNSHINE ,HEAT conduction ,SOLAR system - Abstract
We developed a Monte‐Carlo‐based radiative heat transfer model capable of simulating solar exposure and subsequent warming of rough snow and ice surfaces on ice‐covered airless solar system bodies. The model accounts for wavelength‐dependent internal light scattering and heat conduction in the snow interior down to meter‐scale depths. We validated the model against analytical and experimental test cases with relevant applications to Europa, one of Jupiter's moons. We examined differential heating across the surface, from the centimeter to meter scale, to reveal potential patterns of preferential sublimation that could lead to rough ice morphologies, such as penitentes. An exploration of parameters such as penitente height‐width ratios, shape, size, snow grain size, and thermal properties revealed that taller, thinner, larger penitentes with sharper peaks, coarser snow grain sizes, and lower thermal inertias are more likely to grow in Europa's environment near the equator. Plain Language Summary: Penitentes are sharp, bladed snow structures found on Earth in cold, dry regions with high Sun exposure. Speculated to exist on Jupiter's moon Europa, these formations could pose a hazard for a future lander spacecraft. To determine whether such structures could be present, we developed a computer model that simulates snow warming by the Sun within Europa's cold, dry, vacuum environment. Initial results suggest that penitente growth is possible under certain geometric, optical, and thermal conditions applicable to Europa's environment near the equator. Key Points: We created a radiative heat transfer model that simulates light scattering and absorption in granular media with irregular surfacesUsing the model, we simulated solar warming of snow‐like morphologies relevant to Europa to gain insight into penitente growthResults suggest that taller, sharper penitentes with coarse grains and low thermal inertia are more likely to grow at Europa's equator [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF