A Low-Viscosity Lower Lunar Mantle Implied by Measured Monthly and Yearly Tides

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dc.contributor.authorGoossens, Sander
dc.contributor.authorMatsuyama, Isamu
dc.contributor.authorCascioli, Gael
dc.contributor.authorMazarico, Erwan
dc.date.accessioned2024-10-28T14:30:24Z
dc.date.available2024-10-28T14:30:24Z
dc.date.issued2024-09-14
dc.description.abstractThe Moon's frequency-dependent tidal response, expressed as temporal variations in its gravity field through the Love number k₂ and as dissipation through the quality factor Q, provides information about its interior structure. Lunar laser ranging has provided measurements for Q, but so far no frequency-dependent values for k₂ have been determined. We provide the first spacecraft measurements of k₂ and Q at two frequencies, monthly and yearly, from an analysis of Gravity Recovery and Interior Laboratory and Lunar Reconnaissance Orbiter radio tracking data. Interior modeling indicates that these values can be matched only with a low-viscosity zone at the base of the lunar mantle, even when using complex rheological laws to model the mantle's response. The existence of this zone has profound implications for the Moon's thermal state and evolution.
dc.description.sponsorshipThis work was funded by NASA's Planetary Science Division's Lunar Data Analysis Program (Grant 80NSSC17K0419). Work by GC was supported by NASA under award No. 80GSFC21M0002. We thank Joe Renaud (NASA Goddard/University of Maryland, College Park) for discussions. We thank the editor, Francis Nimmo, for the handling of our manuscript, and Dr. Yuji Harada (Macau University of Science and Technology) and an anonymous reviewer for their helpful comments.
dc.description.urihttps://onlinelibrary.wiley.com/doi/abs/10.1029/2024AV001285
dc.format.extent11 pages
dc.genrejournal articles
dc.identifierdoi:10.13016/m2p6ze-6gt9
dc.identifier.citationGoossens, Sander, Isamu Matsuyama, Gael Cascioli, and Erwan Mazarico. “A Low-Viscosity Lower Lunar Mantle Implied by Measured Monthly and Yearly Tides.” AGU Advances 5, no. 5 (2024): e2024AV001285. https://doi.org/10.1029/2024AV001285.
dc.identifier.urihttps://doi.org/10.1029/2024AV001285
dc.identifier.urihttp://hdl.handle.net/11603/36736
dc.language.isoen_US
dc.publisherWiley
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rightsPublic Domain
dc.rights.urihttps://creativecommons.org/publicdomain/mark/1.0/
dc.subjectGRAIL
dc.subjectfrequency-dependent tides
dc.subjectLunar interior
dc.subjectLRO
dc.titleA Low-Viscosity Lower Lunar Mantle Implied by Measured Monthly and Yearly Tides
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0001-9070-7947

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