Toward Hydrocode Models of an Impact-Generated Martian Greenhouse: Model Validation and Initial Results

Details Toward Hydrocode Models of an Impact-Generated Martian Greenhouse: Model Validation and Initial Results Toward Hydrocode Models of an Impact-Generated Martian Greenhouse: Model Validation and Initial Results

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmmr51b0973p&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #MR51B-0973

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3672 Planetary Mineralogy And Petrology (5410), 3944 Shock Wave Experiments, 5420 Impact Phenomena, Cratering (6022, 8136), 6225 Mars

Scientific paper

Large impacts have been suggested by Carr (1996) and Segura et al. (2002) as a possible trigger of warm and wet climate episodes early in Martian history. Our goal is to model impacts into stratigraphically complicated media, and specifically targets containing water ice in various morphologies, in order to determine a lower bound on the energy and size scales of impact events that could trigger such a climate shift, and thus establish an upper bound on the frequency of such events. To do this, we use various analytical and numerical modeling techniques, including the RAGE hydrocode. RAGE (Baltrusaitis et al. 1996) is an Eulerian hydrocode that runs in up to three dimensions and incorporates a variety of detailed equations of state including the temperature-based SESAME tables maintained by LANL. In order to test the accuracy of RAGE predictions before applying this hydrocode to the problem of interest, we compare code results against analytical models (verification) and laboratory experiments (validation) that are related to the problem of interest. We compare RAGE against various laboratory experiments (Kato et al. 2001, Nakazawa et al. 2002, Koschny et al. 2001), and analytical crater scaling models (Housen et al. 1983, Holsapple and Schmidt 1982, Holsapple 1993, and Melosh 1989). From there, we begin to examine the potential effects of impacts on water ice in the Martian subsurface, first by examining the evolution of the temperature and pressure profiles of an impact into a geologically simple, ice-free target, and then exploring the effects of increased ice content and ice layer morphology. This effort is supported by LANL/IGPP (CSP, RFC, KHW, MLG) and by NASA PG&G (EA). LA-UR-06-6233

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