A Large New Crater Exposes the Limits of Water Ice on Mars

Colin M. Dundas, Michael T. Mellon, Liliya V. Posiolova, Katarina Miljković, Gareth S. Collins, Livio L. Tornabene, Vidhya Ganesh Rangarajan, Matthew P. Golombek, Nicholas H. Warner, Ingrid J. Daubar, Shane Byrne, Alfred S. McEwen, Kimberly D. Seelos, Donna Viola, Ali M. Bramson, Gunnar Speth

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Water ice in the Martian mid-latitudes has advanced and retreated in response to variations in the planet's orbit, obliquity, and climate. A 150 m-diameter new impact crater near 35°N provides the lowest-latitude impact exposure of subsurface ice on Mars. This is the largest known ice-exposing crater and provides key constraints on Martian climate history. This crater indicates a regional, relatively pure ice deposit that is unstable and has nearly vanished. In the past, this deposit may have been tens of meters thick and extended equatorward of 35°N. We infer that it is overlain by pore ice emplaced during temporary stable intervals, due to recent climate variability. The marginal survival of ice here suggests that it is near the edge of shallow ice that regularly exchanges with the atmosphere.

Original languageEnglish (US)
Article numbere2022GL100747
JournalGeophysical Research Letters
Volume50
Issue number2
DOIs
StatePublished - Jan 28 2023

Keywords

  • Mars
  • climate
  • ice
  • midlatitudes
  • subsurface

ASJC Scopus subject areas

  • Geophysics
  • General Earth and Planetary Sciences

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