High-Resolution Gravity Field Models from GRAIL Dataand Implications for Models of the DensityStructure of the Moon's Crust

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dc.contributor.authorGoossens, S.
dc.contributor.authorSabaka, T. J.
dc.contributor.authorWieczorek, M. A.
dc.contributor.authorNeumann, G. A.
dc.contributor.authorMazarico, E.
dc.contributor.authorLemoine, F. G.
dc.contributor.authorNicholas, J. B.
dc.contributor.authorSmith, D. E.
dc.contributor.authorZuber, M. T.
dc.date.accessioned2020-03-11T18:39:16Z
dc.date.available2020-03-11T18:39:16Z
dc.date.issued2019-11-06
dc.description.abstractWe present our latest high-resolution lunar gravity field model of degree and order 1200 in spherical harmonics using Gravity Recovery and Interior Laboratory (GRAIL) data. In addition to a model with the standard spectral Kaula regularization constraint, we determine models by applying a constraint based on topography called rank-minus-one (RM1). The new models using this RM1 constraint have high correlations with topography over the entire degree range by design. The RM1 models allow the determination of apparent crustal densities at all spatial scales (called effective density) covered by the model, whereas the Kaula-constrained model can only be used globally up to spherical harmonic degree 700. We find that the effective density spectrum has a smaller slope for the high degrees when compared to the medium degrees. We interpret this as indicative of a global average surface density, as opposed to an ever-decreasing effective density as one approaches the surface. We use the RM1 models to derive maps of lateral and vertical density variations in the lunar crust. These models allow us to increase the resolution of this analysis compared to previous studies, by increasing the degree range over which to fit theoretical models of vertical density variations, and by decreasing the size of the spherical caps used in a localized analysis. Several regions on the Moon, such as South Pole-Aitken and Mare Orientale, are distinct from their surroundings in terms of surface densities. The RM1 models are especially valuable in (localized) spectral studies of the structure of the lunar crust.en_US
dc.description.sponsorshipThe data used in this study are all available in the Geosciences Node of the NASA Planetary Data System. The lunar gravity field models presented in this study will be made available at the PDS, as well as on our own data portal at https://pgda.gsfc.nasa.gov, along with auxiliary data such as the results presented in several figures. This work was supported by the GRAIL Project and the NASA Discovery Program, and we acknowledge the entire GRAIL Science Team for many constructive discussions about the gravity field models. We sincerely thank the NASA Center for Climate Simulation (NCCS) at NASA Goddard Space Flight Center for the use of their computational resources and their support. We thank Francis Nimmo (UC Santa Cruz) for discussions about the density-depth models, and for his formal review that further improved this paper. We thank the editor, David Baratoux, and an anonymous reviewer: their comments helped improve this paper. We extensively used the freely available SHTOOLS software (Wieczorek & Meschede, 2018) for the localization. All figures were made with the freely available GMT software (Wessel et al., 2013).en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JE006086en_US
dc.format.extent31 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2f2px-wwbb
dc.identifier.citationGoossens, S.; Sabaka, T. J.; Wieczorek, M. A.; Neumann, G. A.; Mazarico, E.; Lemoine, F. G.; Nicholas, J. B.; Smith, D. E.; Zuber, M. T.; High-Resolution Gravity Field Models from GRAIL Dataand Implications for Models of the DensityStructure of the Moon's Crust; JGR Planets 125,2 (2019); https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019JE006086en_US
dc.identifier.urihttps://doi.org/10.1029/2019JE006086
dc.identifier.urihttp://hdl.handle.net/11603/17554
dc.language.isoen_USen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsAccess to this item will begin on 2020-05-06
dc.rights©2018. American Geophysical Union.All Rights Reserved.
dc.titleHigh-Resolution Gravity Field Models from GRAIL Dataand Implications for Models of the DensityStructure of the Moon's Crusten_US
dc.typeTexten_US

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