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dc.contributor.authorDouglas, Thomas A.-
dc.contributor.authorMellon, Michael T.-
dc.identifier.govdocERDC/CRREL MP-21-13-
dc.descriptionMiscellaneous Paperen_US
dc.description.abstractSublimation of ice is rate-controlled by vapor transport away from its outer surface and may have generated landforms on Mars. In ice-cemented ground (permafrost), the lag of soil particles remaining after ice loss decreases subsequent sublimation. Varying soil-ice ratios lead to differential lag development. Here we report 52 years of sublimation measurements from a permafrost tunnel near Fairbanks, Alaska, and constrain models of sublimation, diffusion through porous soil, and lag formation. We derive the first long-term in situ effective diffusion coefficient of ice-free loess, a Mars analog soil, of 9.05 × 10⁻⁶ m² s⁻¹, ~5× larger than past theoretical studies. Exposed ice-wedge sublimation proceeds ~4× faster than predicted from analogy to heat loss by buoyant convection, a theory frequently employed in Mars studies. Our results can be used to map near-surface ice-content differences, identify surface processes controlling landform formation and morphology, and identify target landing sites for human exploration of Mars.en_US
dc.description.sponsorshipUnited States. Army. Corps of Engineers.en_US
dc.description.sponsorshipStrategic Environmental Research and Development Program (U.S.)-
dc.format.extent13 pages / 2.08 MB-
dc.publisherCold Regions Research and Engineering Laboratory (U.S.)en_US
dc.publisherEngineer Research and Development Center (U.S.)-
dc.relation.ispartofseriesMiscellaneous Paper (Engineer Research and Development Center (U.S.)) ; no. ERDC/CRREL MP-21-13-
dc.relation.isversionofDouglas, Thomas A., and Michael T. Mellon. "Sublimation of terrestrial permafrost and the implications for ice-loss processes on Mars." Nature communications 10, no. 1 (2019): 1-9.
dc.rightsApproved for Public Release; Distribution is Unlimited-
dc.sourceThis Digital Resource was created in Microsoft Word and Adobe Acrobat-
dc.subjectIce--Sublimation (Chemistry)en_US
dc.subjectFrozen grounden_US
dc.subjectFairbanks (Alaska)--Soilsen_US
dc.subjectMars (Planet)--Soilsen_US
dc.subjectSpace vehicles--Landing--Mars (Planet)en_US
dc.titleSublimation of terrestrial permafrost and the implications for ice-loss processes on Marsen_US
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