@article{4c020650643544aba3032479351ca41f,
title = "Exposed subsurface ice sheets in the Martian mid-latitudes",
abstract = "Thick deposits cover broad regions of the Martian mid-latitudes with a smooth mantle; erosion in these regions creates scarps that expose the internal structure of the mantle. We investigated eight of these locations and found that they expose deposits of water ice that can be >100 meters thick, extending downward from depths as shallow as 1 to 2 meters below the surface. The scarps are actively retreating because of sublimation of the exposed water ice. The ice deposits likely originated as snowfall during Mars' high-obliquity periods and have now compacted into massive, fractured, and layered ice. We expect the vertical structure of Martian ice-rich deposits to preserve a record of ice deposition and past climate.",
author = "Dundas, {Colin M.} and Bramson, {Ali M.} and Lujendra Ojha and Wray, {James J.} and Mellon, {Michael T.} and Shane Byrne and McEwen, {Alfred S.} and Putzig, {Nathaniel E.} and Donna Viola and Sarah Sutton and Erin Clark and Holt, {John W.}",
note = "Funding Information: Observation planning was funded by the MRO project, and analysis was funded by NASA grants NNH13AV85I (to C.M.D.) and NNX16AP09H (to A.M.B.). L.O. was supported by the Blaustein Postdoctoral Fellowship at Johns Hopkins University. We thank NASA/ Jet Propulsion Laboratory and the instrument teams for their efforts collecting and processing data. The SHARAD instrument was provided to NASA{\textquoteright}s MRO mission by the Italian Space Agency (ASI). We thank M. Christoffersen for help with the HRSC-based clutter simulations, which are available at https://doi.org/10.6084/m9.figshare.5537893. The authors declare no competing financial interests. All of the primary spacecraft data used in this study are available via the Planetary Data System. HiRISE and CTX data are at https://pds-imaging.jpl.nasa. gov/volumes/mro.html, SHARAD data are at http://pds-geosciences. wustl.edu/missions/mro/sharad.htm, CRISM data are at http://pds-geosciences.wustl.edu/missions/mro/crism.htm, and THEMIS data and derived products are at http://viewer.mars.asu.edu/viewer/ themis#T=0; observation ID numbers are listed in tables S2 to S5. Derived thermal inertia data are available via https://se.psi.edu/~than/ inertia and dust cover index and albedo via www.mars.asu.edu/data.",
year = "2018",
month = jan,
day = "12",
doi = "10.1126/science.aao1619",
language = "English (US)",
volume = "359",
pages = "199--201",
journal = "Science",
issn = "0036-8075",
publisher = "American Association for the Advancement of Science",
number = "6372",
}