Paper No. 192-11
Presentation Time: 11:20 AM-11:40 AM
EARTH, MARS, AND VENUS: AEOLIAN FEATURES AND PROCESSES
GREELEY, Ronald, Arizona State Univ, PO Box 871404, Tempe, AZ 85287-1404, Greeley@asu.edu.

Aeolian activity and features reflect the interaction of the atmosphere and the surface, requiring small particles and winds of sufficient strength to move them. Although the composition and density of the atmospheres of Earth, Mars, and Venus are different, all three planets experience aeolian activity now and in the past. Data from orbit and from landers on Mars and Venus reveal a wide variety of wind-related features, including dunes, yardangs, and ventifacts. Understanding aeolian processes and features is critical for derivation of geological histories, interpretation of remote sensing data, and for aspects of landed surface operations, such as the collection of samples for return to Earth. Analysis of the types and orientations of some aeolian features provides insight into past climates, including the directions of possible paleowinds. The approach used to derive this understanding includes physical and computer modeling under conditions appropriate for the planet under consideration, analysis of spacecraft data, and study of terrestrial analogs. This latter aspect is particularly critical because it provides the "ground truth" for understanding the fundamental physics and geology of aeolian processes.

2002 Denver Annual Meeting (October 27-30, 2002)
Session No. 192
There and Back Again: Terrestrial Approaches to Extraterrestrial Problems
Colorado Convention Center: Ballroom 2&3
8:00 AM-12:00 PM, Wednesday, October 30, 2002
 

© Copyright 2002 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.