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Thermal Conductivity of the Martian Soil at the InSight Landing site from HP3 Active Heating Experiments

Grott, Matthias and Spohn, Tilman and Knollenberg, Jörg and Krause, Christian and Hudson, T.L. and Piqueux, S. and Müller, Nils and Golombek, M. and Vrettos, C. and Marteau, E. and Nagihara, S. and Morgan, P. and Murphy, J. and Siegler, M.A. and King, S.D. and Smrekar, S. and Banerdt, B. (2021) Thermal Conductivity of the Martian Soil at the InSight Landing site from HP3 Active Heating Experiments. JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS, 126, e2021JE006861. Wiley. doi: 10.1029/2021JE006861. ISSN 2169-9097.

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Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021JE006861


The heat flow and physical properties package (HP3) of the InSight Mars mission is an instrument package designed to determine the martian planetary heat flow. To this end, the package was designed to emplace sensors into the martian subsurface and measure the thermal conductivity as well as the geothermal gradient in the 0-5 m depth range. After emplacing the probe to a tip depth of 0.37 m, a first reliable measurement of the average soil thermal conductivity in the 0.03 to 0.37 m depth range was performed. Using the HP3 mole as a modified line heat source, we determined a soil thermal conductivity of 0.039 +/- 0.002 W/mK, consistent with the results of orbital and in-situ thermal inertia measurements. This low thermal conductivity implies that 85 to 95% of all particles are smaller than 104-173 micrometer and suggests that any cement contributing to soil cohesion cannot significantly increase grain-to-grain contact areas by forming cementing necks, but could be distributed in the form of grain coatings instead. Soil densities compatible with the measurements are 1211(-113+149) kg/m3, indicating soil porosities of 61 %

Item URL in elib:https://elib.dlr.de/141828/
Document Type:Article
Title:Thermal Conductivity of the Martian Soil at the InSight Landing site from HP3 Active Heating Experiments
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Grott, MatthiasMatthias.Grott (at) dlr.deUNSPECIFIED
Spohn, TilmanTilman.Spohn (at) dlr.deUNSPECIFIED
Knollenberg, JörgJoerg.Knollenberg (at) dlr.deUNSPECIFIED
Krause, ChristianChristian.Krause (at) dlr.deUNSPECIFIED
Hudson, T.L.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, USAUNSPECIFIED
Piqueux, S.jet propulsion laboratory, california institute of technology (pasadena, ca, 91109)UNSPECIFIED
Müller, NilsNils.Mueller (at) dlr.deUNSPECIFIED
Golombek, M.jet propulsion laboratory, pasadena, ca, usahttps://orcid.org/0000-0002-1928-2293
Vrettos, C.Division of Soil Mechanics and Foundation Engineering, Technical University of Kaiserslautern, Kaiserslautern, GermanyUNSPECIFIED
Marteau, E.Jet Propulsion Laboratory, Pasadena, CA, USAUNSPECIFIED
Nagihara, S.Texas Tech Univ.UNSPECIFIED
Morgan, P.Colorado Geological SurveyColorado School of MinesGolden, USAUNSPECIFIED
Murphy, J.virginia institute of technology, blacksburg, va, usaUNSPECIFIED
Siegler, M.A.Southern Methodist University, Dallas, Texas, USAUNSPECIFIED
King, S.D.virginia institute of technology, blacksburg, va, usaUNSPECIFIED
Smrekar, S.Jet Propulsion Laboratory, California Institute of Technology, PasadenaUNSPECIFIED
Banerdt, B.Jet Propulsion Laboratory, Pasadena, CA, USAUNSPECIFIED
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1029/2021JE006861
Page Range:e2021JE006861
Keywords:Mars, Regolith, Thermal Conductivity, Heat Flow, Geophysics, InSight
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project InSight - HP3
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Planetary Physics
Space Operations and Astronaut Training > User center for space experiments (MUSC)
Deposited By: Grott, Dr.rer.nat. Matthias
Deposited On:10 Sep 2021 09:35
Last Modified:19 Nov 2021 20:31

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