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Formation of metre-scale bladed roughness on Europa's surface by ablation of ice

Hobley, Daniel E. J., Moore, Jeffrey M., Howard, Alan D. and Umurhan, Orkan M. 2018. Formation of metre-scale bladed roughness on Europa's surface by ablation of ice. Nature Geoscience 11 , pp. 901-904. 10.1038/s41561-018-0235-0

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Abstract

On Earth, the sublimation of massive ice deposits at equatorial latitudes under cold and dry conditions in the absence of any liquid melt leads to the formation of spiked and bladed textures eroded into the surface of the ice. These sublimation-sculpted blades are known as penitentes. For this process to take place on another planet, the ice must be sufficiently volatile to sublimate under surface conditions and diffusive processes that act to smooth the topography must operate more slowly. Here we calculate sublimation rates of water ice across the surface of Jupiter’s moon Europa. We find that surface sublimation rates exceed those of erosion by space weathering processes in Europa’s equatorial belt (latitudes below 23°), and that conditions would favour penitente growth. We estimate that penitentes on Europa could reach 15 m in depth with a spacing of 7.5 m near the equator, on average, if they were to have developed across the interval permitted by Europa’s mean surface age. Although available images of Europa have insufficient resolution to detect surface roughness at the multi-metre scale, radar and thermal data are consistent with our interpretation. We suggest that penitentes could pose a hazard to a future lander on Europa.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Nature Publishing Group
ISSN: 1752-0894
Date of First Compliant Deposit: 17 October 2018
Date of Acceptance: 24 August 2018
Last Modified: 02 Jul 2019 14:43
URI: http://orca.cf.ac.uk/id/eprint/115808

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