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SUMMARY:Sublimation-driven convection in Sputnik Planitia on Pluto - Adrie
 n Morison\, University of Exeter
DTSTART:20220316T160000Z
DTEND:20220316T170000Z
UID:TALK168047@talks.cam.ac.uk
CONTACT:Florian Millet
DESCRIPTION:The flyby of Pluto in 2015 by New Horizons gave us a wealth of
  observations showing the dwarf planet is still surprisingly active. A par
 ticularly striking feature is Sputnik Planitia\, an impact crater filled w
 ith nitrogen ice. Its surface exhibits polygonal patterns that have been i
 mmediately identified as a marker of solid-state convection occurring in t
 he ice. However\, the buoyancy source remained unclear as existing models 
 predicted patterns that are inconsistent with the ones observed. We show i
 n this study that sublimation of the ice could\, by pumping latent heat ou
 t of the underlying ice\, power convection in Sputnik Planitia in a way th
 at is consistent with observations. This would make Sputnik Planitia the f
 irst known solid layer with planetary scale dynamics that are powered by c
 limate instead of internal sources.
LOCATION:ONLINE - Details to be sent by email
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