Amy Courtright Barr

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[1] Enceladus’ south polar region has a large heat flux, 55–110 mW m , that is spatially associated with cryovolcanic and tectonic activity. Tidal dissipation and vigorous convection in the underlying ice shell are possible sources of heat, however, prior predictions of the heat flux carried by stagnant lid convection range from Fconv 15 to 30 mW m , too(More)
[1] Ice I exhibits a complex rheology at temperature and pressure conditions appropriate for the interiors of the ice I shells of Europa, Ganymede, and Callisto. We use numerical methods and existing parameterizations of the critical Rayleigh number to determine the conditions required to trigger convection in an ice I shell with each of the stress-,(More)
[1] At the temperatures and stresses associated with the onset of convection in an ice I shell of the Galilean satellites, ice behaves as a non-Newtonian fluid with a viscosity that depends on both temperature and strain rate. The convective stability of a non-Newtonian ice shell can be judged by comparing the Rayleigh number of the shell to a critical(More)
0019-1035/$ see front matter 2010 Elsevier Inc. A doi:10.1016/j.icarus.2010.10.022 ⇑ Corresponding author at: Department of Space Institute, 1050 Walnut St., Suite 300, Boulder, CO 8030 546 9687. E-mail address: amy@boulder.swri.edu (A.C. Barr). The volume of melt produced in hypervelocity planetary impacts and the size and shape of the melted region are(More)
The onset of convection in the power-law creep regime on the terrestrial planets and icy satellites is poorly constrained. The major difficulty is that the viscosity of power-law fluids approaches infinity when the perturbation amplitudes approach zero and thus the methods of linear theory are inapplicable. Here, we determine the critical Rayleigh number(More)
Introduction: Numerical simulations of solidstate convection in Europa’s ice shell have so far been limited to consideration of Newtonian flow laws, where the viscsoity of ice is strongly dependent upon temperature, predicting that a stagnant lid should form at the top (10-40%) of a convecting ice shell [1, 2]. Such large thicknesses seem to contradict(More)
To further our understanding of the consequences of training in recovery principles and practices, this study examined ACT team workers' responses to a state-wide recovery training initiative. Analysis of trainees' comments revealed ten themes expressing endorsement of or difficulties with recovery-oriented practices. Trainees' comments supporting a(More)
[1] The surface of Jupiter’s moon Europa is peppered by topographic domes, interpreted as sites of intrusion and extrusion. Diapirism is consistent with dome morphology, but thermal buoyancy alone cannot produce sufficient driving pressures to create the observed dome elevations. Instead, diapirs may initiate by thermal convection that induces compositional(More)