Measurements of thermal properties of icy Mars regolith analogs
In a series of laboratory experiments, we measure thermal diffusivity, thermal conductivity, and heat capacity of icy regolith created by vapor deposition of water below its triple point and in a low pressure atmosphere. We find that an ice-regolith mixture prepared in this manner, which may be comm...
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American Geophysical Union
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ftcaltechauth:oai:authors.library.caltech.edu:bf4f9-kz243 2024-09-15T18:11:35+00:00 Measurements of thermal properties of icy Mars regolith analogs Siegler, Matthew Aharonson, Oded Carey, Elizabeth Choukroun, Mathieu Hudson, Troy Schorghofer, Norbert Xu, Steven 2012-03-07 https://doi.org/10.1029/2011JE003938 unknown American Geophysical Union https://doi.org/10.1029/2011JE003938 oai:authors.library.caltech.edu:bf4f9-kz243 eprintid:30059 resolverid:CaltechAUTHORS:20120411-103559909 info:eu-repo/semantics/openAccess Other Journal of Geophysical Research E, 117(E3), Art. No. E03001, (2012-03-07) Mars ice permafrost regolith thermal conductivity thermal properties info:eu-repo/semantics/article 2012 ftcaltechauth https://doi.org/10.1029/2011JE003938 2024-08-06T15:35:00Z In a series of laboratory experiments, we measure thermal diffusivity, thermal conductivity, and heat capacity of icy regolith created by vapor deposition of water below its triple point and in a low pressure atmosphere. We find that an ice-regolith mixture prepared in this manner, which may be common on Mars, and potentially also present on the Moon, Mercury, comets and other bodies, has a thermal conductivity that increases approximately linearly with ice content. This trend differs substantially from thermal property models based of preferential formation of ice at grain contacts previously applied to both terrestrial and non-terrestrial subsurface ice. We describe the observed microphysical structure of ice responsible for these thermal properties, which displaces interstitial gases, traps bubbles, exhibits anisotropic growth, and bridges non-neighboring grains. We also consider the applicability of these measurements to subsurface ice on Mars and other solar system bodies. © 2012 by the American Geophysical Union. Received 18 August 2011; revised 20 December 2011; accepted 20 December 2011; published 7 March 2012. We thank Julie Castillo, Doug Cobos, Michael Hecht, Gerard Kluitenberg, Kenneth Libbrecht, Michael Mellon, David Paige, Marsha Presley, Al Slavin, and Steven Wood for their useful discussions and Axel Schmidt for aid in measuring grain surface roughness, Karen Wacker for the construction of and insightful discussion in designing our thermal properties probe, and Hermann Engelhardt, Liz Carey, and Kenny Oslund for years of guidance and dedication in the lab. This work was supported by the Mars Fundamental Research Program. Part of this work has been conducted at the Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA. Government sponsorship acknowledged. Published - Siegler2012p17729J_Geophys_Res-Planet.pdf Article in Journal/Newspaper Ice permafrost Caltech Authors (California Institute of Technology) Journal of Geophysical Research: Planets 117 E3 |
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Caltech Authors (California Institute of Technology) |
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topic |
Mars ice permafrost regolith thermal conductivity thermal properties |
spellingShingle |
Mars ice permafrost regolith thermal conductivity thermal properties Siegler, Matthew Aharonson, Oded Carey, Elizabeth Choukroun, Mathieu Hudson, Troy Schorghofer, Norbert Xu, Steven Measurements of thermal properties of icy Mars regolith analogs |
topic_facet |
Mars ice permafrost regolith thermal conductivity thermal properties |
description |
In a series of laboratory experiments, we measure thermal diffusivity, thermal conductivity, and heat capacity of icy regolith created by vapor deposition of water below its triple point and in a low pressure atmosphere. We find that an ice-regolith mixture prepared in this manner, which may be common on Mars, and potentially also present on the Moon, Mercury, comets and other bodies, has a thermal conductivity that increases approximately linearly with ice content. This trend differs substantially from thermal property models based of preferential formation of ice at grain contacts previously applied to both terrestrial and non-terrestrial subsurface ice. We describe the observed microphysical structure of ice responsible for these thermal properties, which displaces interstitial gases, traps bubbles, exhibits anisotropic growth, and bridges non-neighboring grains. We also consider the applicability of these measurements to subsurface ice on Mars and other solar system bodies. © 2012 by the American Geophysical Union. Received 18 August 2011; revised 20 December 2011; accepted 20 December 2011; published 7 March 2012. We thank Julie Castillo, Doug Cobos, Michael Hecht, Gerard Kluitenberg, Kenneth Libbrecht, Michael Mellon, David Paige, Marsha Presley, Al Slavin, and Steven Wood for their useful discussions and Axel Schmidt for aid in measuring grain surface roughness, Karen Wacker for the construction of and insightful discussion in designing our thermal properties probe, and Hermann Engelhardt, Liz Carey, and Kenny Oslund for years of guidance and dedication in the lab. This work was supported by the Mars Fundamental Research Program. Part of this work has been conducted at the Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA. Government sponsorship acknowledged. Published - Siegler2012p17729J_Geophys_Res-Planet.pdf |
format |
Article in Journal/Newspaper |
author |
Siegler, Matthew Aharonson, Oded Carey, Elizabeth Choukroun, Mathieu Hudson, Troy Schorghofer, Norbert Xu, Steven |
author_facet |
Siegler, Matthew Aharonson, Oded Carey, Elizabeth Choukroun, Mathieu Hudson, Troy Schorghofer, Norbert Xu, Steven |
author_sort |
Siegler, Matthew |
title |
Measurements of thermal properties of icy Mars regolith analogs |
title_short |
Measurements of thermal properties of icy Mars regolith analogs |
title_full |
Measurements of thermal properties of icy Mars regolith analogs |
title_fullStr |
Measurements of thermal properties of icy Mars regolith analogs |
title_full_unstemmed |
Measurements of thermal properties of icy Mars regolith analogs |
title_sort |
measurements of thermal properties of icy mars regolith analogs |
publisher |
American Geophysical Union |
publishDate |
2012 |
url |
https://doi.org/10.1029/2011JE003938 |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
Journal of Geophysical Research E, 117(E3), Art. No. E03001, (2012-03-07) |
op_relation |
https://doi.org/10.1029/2011JE003938 oai:authors.library.caltech.edu:bf4f9-kz243 eprintid:30059 resolverid:CaltechAUTHORS:20120411-103559909 |
op_rights |
info:eu-repo/semantics/openAccess Other |
op_doi |
https://doi.org/10.1029/2011JE003938 |
container_title |
Journal of Geophysical Research: Planets |
container_volume |
117 |
container_issue |
E3 |
_version_ |
1810449176550440960 |