2026-06-28T15:21:06Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/567782023-08-27T19:24:43Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Tejero López, Rosa author Ruiz Pérez, Javier author 2003 Recent investigations into convection in Europa’s ice shell have been based on non- Newtonian (stress-dependent) or Newtonian (stress-independent) viscosity for water ice. However, despite the wide use of Newtonian convection, experimentally observed water ice flow is non-Newtonian, and analysis of stability against convection of the ice shell using updated flow laws has been only performed for non-Newtonian rheologies. Here we use the flow law proposed for diffusion creep to analyze the possibility of the onset of convection for Newtonian viscosity in relation to the thermal state of Europa. Our findings indicate that for diffusion creep convection might have started, but that significantly lower heat flows (and equivalently higher shell thicknesses) and/or grain sizes are required than for superplastic flow, which is the most probable flow mechanism if the ice shell is convective. 0167-9295 https://hdl.handle.net/20.500.14352/56778 http://www.springer.com/astronomy/journal/11038 Possibility of convection for diffusion (Newtonian)Viscosity in the ice shell of Europa?