planetary surface processeswray.eas.gatech.edu/physicsplanets2012/lecturenotes/... · 2012. 11....
TRANSCRIPT
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Planetary Surface Processes Cratering Gravity Tectonics Volcanism Winds Fluvial Glacial Chemical weathering
Glacial
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Glaciers on Mars
Dickson et al. 2008
Neukum, Mars Express HRSC
Fastook et al. 2008
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A glacier at equilibrium
Melosh (2011)
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Flow velocity is not uniform
Side view:
Overhead view:
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Glacial creep
Melosh (2011)
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Cold vs. warm-based glaciers
Melosh (2011)
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Polar caps: Strong Seasonal Changes Climate Changes as Spin Axis Wobbles
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Polar Caps: Radar & Interior Structure
Putzig et al. 2008 LPSC XXIX
Southern Cap
Milkovich et al. 2008 LPSC XXIX
Northern Cap
Data from MRO SHARAD.
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“Swiss cheese terrain” – south polar CO2
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Changes in Swiss cheese terrain
Growth at edges from sublimation due to oblique sunlight
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“Sponge terrain” on Hyperion
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Suncups on Earth
http://climber.org/reports/images/1400/1487-ScimitarPassSatansSunCups.jpg
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Planetary Interiors
Read chapter 6!!
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Planetary Interiors
We’d like to know: • Composition (bulk, and
how it varies w/ depth)
• State of matter (function of temperature, pressure)
• Sources of internal energy
What we can measure: • Surface/atmospheric
composition • Mass, radius (àdensity) • Gravity field • Rotation and oblateness • Magnetic field • Temperature à heat flux • Seismic wave
propagation • Topography, surface
morphology
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Credit: Phil Nicholson
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Bulk density continued: KBOs
Pluto
Triton
Eris Haumea
Quaoar
http://www.mikebrownsplanets.com
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Bulk density continued: exoplanets
Szabó & Kiss (2011)