Sublimation of Mar's southern seasonal CO2 ice cap and the formation of spiders

Sylvain Piqueux, Shane Byrne, Mark I. Richardson

Research output: Contribution to journalArticle

93 Scopus citations

Abstract

In this paper we define and describe morphological features that have colloquially been termed "spiders" and map their distribution in the south polar region of Mars. We show that these features go through a distinct seasonal evolution, exhibiting dark plumes and associated fan-shaped deposits during the local defrosting of the seasonal cap. We have documented the seasonal evolution of the cryptic region and have found that spiders only occur within this terrain. These observations are consistent with a geyser-like model for spider formation. Association with the transparent (cryptic) portion of the seasonal cap is consistent with basal sublimation and the resulting venting of CO2 gas. Also consistent with such venting is the observation of dark fan-shaped deposits apparently emanating from spider centers. Spiders are additionally confined to the polar layered deposits presumably due to the poorly consolidated and easily eroded nature of their upper surface.

Original languageEnglish (US)
Pages (from-to)3-1
Number of pages3
JournalJournal of Geophysical Research: Space Physics
Volume108
Issue number8
Publication statusPublished - Aug 25 2003
Externally publishedYes

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Keywords

  • Geyser
  • Mars
  • Polar layered deposits
  • Seasonal cap
  • Spiders

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Astronomy and Astrophysics

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