Seasonal activity and morphological changes in martian gullies

Colin M. Dundas, Serina Diniega, Candice J. Hansen, Shane Byrne, Alfred S. McEwen

Research output: Contribution to journalArticle

86 Citations (Scopus)

Abstract

Recent studies of martian dune and non-dune gullies have suggested a seasonal control on present-day gully activity. The timing of current gully activity, especially activity involving the formation or modification of channels (which commonly have been taken as evidence of fluvial processes), has important implications regarding likely gully formation processes and necessary environmental conditions. In this study, we describe the results of frequent meter-scale monitoring of several active gully sites by the High Resolution Imaging Science Experiment (HiRISE) on the Mars Reconnaissance Orbiter (MRO). The aim is to better assess the scope and nature of current morphological changes and to provide improved constraints on timing of gully activity on both dune and non-dune slopes. Our observations indicate that (1) gully formation on Mars is ongoing today and (2) the most significant morphological changes are strongly associated with seasonal frost and defrosting activity. Observed changes include formation of all major components of typical gully landforms, although we have not observed alcove formation in coherent bedrock. These results reduce the need to invoke recent climate change or present-day groundwater seepage to explain the many martian gullies with pristine appearance.

Original languageEnglish (US)
Pages (from-to)124-143
Number of pages20
JournalIcarus
Volume220
Issue number1
DOIs
StatePublished - Jul 2012

Fingerprint

gully
dunes
defrosting
time measurement
Mars Reconnaissance Orbiter
landforms
seepage
frost
bedrock
climate change
ground water
dune
Mars
mars
slopes
fluvial process
high resolution
landform
environmental conditions
groundwater

Keywords

  • Geological processes
  • Ices
  • Mars, Climate
  • Mars, Surface

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Seasonal activity and morphological changes in martian gullies. / Dundas, Colin M.; Diniega, Serina; Hansen, Candice J.; Byrne, Shane; McEwen, Alfred S.

In: Icarus, Vol. 220, No. 1, 07.2012, p. 124-143.

Research output: Contribution to journalArticle

Dundas, Colin M. ; Diniega, Serina ; Hansen, Candice J. ; Byrne, Shane ; McEwen, Alfred S. / Seasonal activity and morphological changes in martian gullies. In: Icarus. 2012 ; Vol. 220, No. 1. pp. 124-143.
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