NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Troughs on Martian Ice Sheets: Analysis of Their Closure and Mass BalanceAt the Copenhagen workshop on Martian polar processes, Ralf Greve commented that the flow regime surrounding scarps and troughs of the Martian polar ice sheets cannot be modeled using traditional "plan view" ice-sheet models. Such models are inadequate because they typically use reduced equations that embody certain simplifications applicable only to terrestrial ice sheets where the upper ice sheet surface is smooth. In response to this suggestion, we have constructed a 2-dimensional, time dependent "side view" (two spatial dimensions: one horizontal, one vertical) model of scarp closure that is designed to overcome the difficulties described by Greve. The purpose of the model is to evaluate the scales of stress variation and styles of flow closure so as to estimate errors that may be encountered by "plan view" models. We show that there may be avenues whereby the complications associated with scarp closure can be overcome in "plan view" models through appropriate parameterizations of 3-dimensional effects. Following this, we apply the flow model to simulate the evolution of a typical scarp on the North Polar Cap of Mars. Our simulations investigate: (a) the role of "radiation trapping" (see our companion abstract) in creating and maintaining "spiral-like" scarps on the ice sheet, (b) the consequences of different flowlaws and ice compositions on scarp evolution and, in particular, scarp age, and (c) the role of dust and debris in scarp evolution.
Document ID
20010002431
Document Type
Conference Paper
Authors
Fountain, A. (Portland State Univ. OR United States)
Kargel, J. (Geological Survey Flagstaff, AZ United States)
Lewis, K. (Colorado Univ. Boulder, CO United States)
MacAyeal, D. (Chicago Univ. Chicago, IL United States)
Pfeffer, T. (Colorado Univ. Boulder, CO United States)
Zwally, J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 20, 2013
Publication Date
August 1, 2000
Publication Information
Publication: International Conference on Mars Polar Science and Exploration
Subject Category
Lunar and Planetary Science and Exploration
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

IDRelationTitle20010002405Analytic PrimarySecond International Conference on Mars Polar Science and Exploration