Terrestrial Sea Ice Morphology: Considerations for Europa
نویسندگان
چکیده
strength of ice sheets. Salts are also suspected in the europan ice and could lead to similar differences, enhancing the creation The Galileo mission has returned the first high-resolution of topographic relief from density contrasts and the formation (21 m/pixel) images of the surface of Europa. These images of fractures from brittle failure of the ice. Differences in the reveal structures with morphologies reminiscent of those seen environments between Europa and terrestrial sea ice in terms on terrestrial sea ice. Although it is premature to make oneof parameters such as temperature, gravity, time, and ice comto-one analogies between sea ice and Europa’s surface, a review positions suggest caution in drawing direct analogies. Future of the types of surface features commonly formed on Earth work by the planetary and sea-ice communities must include and of various sea-ice processes can provide insight into the understanding the terrestrial processes sufficiently for extrapocomplex geology of Europa. For example, deformation of terreslation to Europa. 1998 Academic Press trial sea ice results from winds, tides, and currents and from
منابع مشابه
The Search for a Habitable Europa: Radar, Water and an Active Ice Shell
Future Europa exploration will seek to characterize the distribution of shallow subsurface water as well as to understand the formation of surface features through dynamic ice-shell processes. Radar sounding will be a critical tool for detecting these features, and should be of primary interest to the astrobiology community for understanding how and where life might arise on Europa. To develop ...
متن کاملConstraints on Europa’s surface properties from primary and secondary crater morphology
[1] We investigate the near‐surface properties of Europa’s ice shell by examining small crater morphology; we use both primary and secondary craters for our analysis. For primary craters, the simple‐to‐complex transition provides an estimate of 0.19–0.36 MPa for the cratering effective strength. Through the aggregate statistics of over 100 profiles, we find that secondary craters on Europa tend...
متن کاملA Thermodynamical Model of the Icy Crust of Europa
Introduction. A fundamental question concerning Europa’s ice shell is whether the rigid lithosphere vis ible at the surface is underlain by a layer of warm, convecting ice. The heat produced by tidal friction in Europa’s silicate interior might be shed by simple conduction through a passive, relatively thin ice shell directly overlying a subsurface sea, or transported equally well through a muc...
متن کاملSilverpit: the Morphology of a Terrestrial Multi-ringed Impact Structure
Introduction: The Silverpit impact structure was discovered during 2001 on three-dimensional (3D) seismic data obtained during routine hydrocarbon exploration in the southern North Sea [1]. It is now known that five commercially-acquired 3D seismic datasets partially cover the structure and approximately 80% of Silverpit is imaged by high-resolution 3D data (Figure 1). Two boreholes had been dr...
متن کاملEfficient Localization in a Dispersive Waveguide : Applications in Terrestrial Continental Shelves and on Europa
by Sunwoong Lee Submitted to the Department of Mechanical Engineering on May 5, 2006, in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mechanical Engineering Methods are developed for passive source localization and environmental parameter estimation in seismo-acoustic waveguides by exploiting the dispersive behavior of guided wave propagation. The methods de...
متن کامل