Persistence of thin ice regions in Europa's ice crust

Details Persistence of thin ice regions in Europa's ice crust Persistence of thin ice regions in Europa's ice crust

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29v..12b&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 22, pp. 12-1, CiteID 2055, DOI 10.1029/2002GL016171

Computer Science

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Planetary Sciences: Heat Flow, Planetology: Comets And Small Bodies: Satellites, Planetology: Solar System Objects: Jovian Satellites, Planetary Sciences: Interiors (8147)

Scientific paper

Extensive data from planetary spacecraft as well as celestial mechanics models support the existence of a subsurface ocean on Europa ~100 km thick, maintained by a tidal heat flux. Models in which the overlying ice crust is less than 20 km thick permit breaches in the ice due to impact events or thermal plumes from the tidally heated core. We apply a two-dimensional thermal model to the analysis of the refreezing of a hole in the ice crust following a breach event. Our model incorporates heat produced by tidal heating of Europa in two ways: a basal heat flux from Europa's silicate and iron core, together with volumetric heating of the ice shell. We compare our refreezing timescales to those obtained from a model where viscous flow in the base of the ice crust fills the hole. We find that catastrophic breaches in Europa's ice crust may produce regions of relatively thin ice persisting up to ~1 My. These breaches are closed by viscous flow when radii are small (<10-50 km) and by conductive refreezing for larger radii, especially if Europa's crust has a high basal heat flow due to a hot core. Detection of the ice/ocean interface by orbital detection of the temperature anomalies or radar sounding would be most probable in the vicinity of these events.

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