Mercury's low-degree geoid and topography controlled by insolation-driven elastic deformation
| Autor: | Ondřej Čadek, M. Káňová, Mark A. Wieczorek, Nicola Tosi, Sebastiano Padovan, Marie Běhounková, Doris Breuer, Matthias Grott, Ana-Catalina Plesa |
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| Přispěvatelé: | German Aerospace Center (DLR), Institut de Physique du Globe de Paris (IPGP), Centre National de la Recherche Scientifique (CNRS)-Université de La Réunion (UR)-Université Paris Diderot - Paris 7 (UPD7)-IPG PARIS-Institut national des sciences de l'Univers (INSU - CNRS), Charles University [Prague] (CU), Institut national des sciences de l'Univers (INSU - CNRS)-IPG PARIS-Université de La Réunion (UR)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP) |
| Rok vydání: | 2015 |
| Předmět: |
low-degree
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] chemistry.chemical_element elastic deformation geoid Mantle (geology) Physics::Geophysics [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology Mantle convection topography Lithosphere Thermal Geoid ddc:550 ComputingMilieux_MISCELLANEOUS Spacecraft business.industry Spherical harmonics Geophysics Mercury Geodesy Mercury (element) chemistry 13. Climate action Physics::Space Physics General Earth and Planetary Sciences Astrophysics::Earth and Planetary Astrophysics business Geology |
| Zdroj: | Geophysical Research Letters Geophysical Research Letters, American Geophysical Union, 2015, 42 (18), pp.7327-7335. ⟨10.1002/2015GL065314⟩ |
| ISSN: | 0094-8276 1944-8007 |
| Popis: | ©2015. American Geophysical Union Mercury experiences an uneven insolation that leads to significant latitudinal and longitudinal variations of its surface temperature. These variations, which are predominantly of spherical harmonic degrees 2 and 4, propagate to depth, imposing a long‐wavelength thermal perturbation throughout the mantle. We computed the accompanying density distribution and used it to calculate the mechanical and gravitational response of a spherical elastic shell overlying a quasi‐hydrostatic mantle. We then compared the resulting geoid and surface deformation at degrees 2 and 4 with Mercury's geoid and topography derived from the MErcury, Surface, Space ENvironment, GEochemistry, and Ranging spacecraft. More than 95% of the data can be accounted for if the thickness of the elastic lithosphere were between 110 and 180 km when the thermal anomaly was imposed. The obtained elastic thickness implies that Mercury became locked into its present 3:2 spin orbit resonance later than about 1 Gyr after planetary formation. |
| Databáze: | OpenAIRE |
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