Timothy Titus, USGS James Zimbelman, SI Jani Radebaugh, BYU

Transcription

1 Timothy Titus, USGS James Zimbelman, SI Jani Radebaugh, BYU

2 10/29/2015 VEXAG 2

3 Increase the cross-talk and collaborations between Terrestrial Aeolian Scientists Planetary Aeolian Scientists Multiple Disciplines Facilitate the fusion of Remote Sensing Analog Research Laboratory Experiments including wind tunnels Computer Modeling and Simulations Prepare the next generation of scientists Graduate Students Undergraduates 10/29/2015 VEXAG 3

4 2008 Alamagordo, NM EOS Meeting Report Geomorphology 2010 Alamosa, CO EOS Meeting Report Aeolian Research Report Earth Srf Processes & Landforms 2012 Flagstaff, AZ EOS Meeting Report Aeolian Research Report Icarus Special Issue 2015 Boise, ID EOS Meeting Report Aeolian Research (In progress) 2017 St. Geo., UT All have been organized in cooperation with the Lunar Planetary Institute All abstracts are available online 10/29/2015 VEXAG 4

5 Timothy Titus U.S. Geological Survey Joshua Bandfield Space Science Institute Mary Bourke Trinity College Dublin Lori Fenton Carl Sagan Center at the SETI Institute Rosalyn Hayward U.S. Geological Survey Briony Horgan Purdue University Jani Radebaugh Brigham Young University James Zimbelman Smithsonian Institute Kreslavsky M. A. * Bondarenko N. V. Aeolian Bedforms Associated with Radar-Dark Diffuse Features on Venus [#8035] Lorenz R. D. * Heights of Fortuna- Meshknet Dunes (Al-Uzza Undae), Venus, from Magellan Radarclinometry [#8004] Lorenz R. D. Fenton L. Lancaster N. The Tallest Dunes in the Solar System? Dune Heights on Earth, Mars, Titan and Venus [#8031] Neakrase L. D. V. Terrestrial Analogs for Venusian Dunes: Sub- Aqueous, Seafloor Dune Fields [#8023] 10/29/2015 VEXAG 5

6 Tuesday Talks Poster Session/Reception Wednesday Field Trip Day Thursday Talks Friday Talks Review Cross-cutting Themes This is a workshop Talks are 30 minutes 15 minutes for talk 15 minutes for questions Limit to ~ 20 slides Sessions have 30 minutes at the end for discussions Posters in the same room as talks Catered lunches 10/29/2015 VEXAG 6

7 60 Registered Attendees Professionals Graduate Students Undergraduates 1 High School Student International Flavor 4 Continents 8 Nations Remote Sensing In situ studies Computer Modeling Laboratory Experiments 10/29/2015 VEXAG 7

8 Aeolian bed forms, or dune-like structures, are observed throughout the solar system. Equifinality Transverse Aeolian Ridges. Importance of Megadunes. The Search for Sand Sources. 10/29/2015 VEXAG 8

9 Terrestrial Planets Venus Earth Land/Deserts Oceans/Rivers Mars Outer Planet Satellites Titan Triton? Airless Bodies Comets Volatile Rich Impacts 10/29/2015 VEXAG 9

10 Similar morphologies formed by different processes in a range of enviroments. Size Range Sand Ripples (centimeter scale) Megadunes (kilometer scale) Range of Atmospheric Densities and Properties Transient Atmospheres Mars & Earth (Land) Titan & Venus Oceans and Rivers 10/29/2015 VEXAG 10

11 Mars Large Ripples Small Dunes Reversing Dunes Anti-Dunes Dust Composition? 10/29/2015 VEXAG 11

12 Properties 1 Kilometer in width Long-lived Currently active Dominate many locations on planetary surfaces Formation Conditions Not well understood Elongation due to transport Linear Dunes Titan Mars Venus??? 10/29/2015 VEXAG 12

13 Multiple Processes are the sources of sediment Earth Tectonics Volcanism Erosion Aeolian Fluvial Mars Volcanism Cratering Wind Erosion Venus Only a few dunes Lack of sediment? Volcanism Cratering Titan Photodissociation of methane in upper atmosphere It snows hydrocarbons 10/29/2015 VEXAG 13

14 Al-Uzza Undae Diameter: 150 km Location: 67.7N 90.5E Menat Undae Diamter: 100 km Location: 24.8S 339.4E 2 Know Dune Fields Microdunes may be present Why the lack of dunes? Low wind speeds? Lack of sediment? Lack of higher spatial resolution data to resolve smaller dune fields? 10/29/2015 VEXAG 14

15 St. George, UT; May 2017 Tentatively Dixie State Registration: ~$225 Focus Thick Atmospheres Venus Oceans and Rivers as Analogs 10/29/2015 VEXAG 15

16 Website has expanded to include many worlds. Aeolian Research Special Issue Due Ground Hogs Day (2 Feb 2016) Contacts Matt Chojnacki 10/29/2015 VEXAG 16