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Long-term stability of Enceladus' uneven ice shell

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F19%3A10403988" target="_blank" >RIV/00216208:11320/19:10403988 - isvavai.cz</a>

  • Result on the web

    <a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=z.L6XwmF0T" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=z.L6XwmF0T</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.icarus.2018.10.003" target="_blank" >10.1016/j.icarus.2018.10.003</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Long-term stability of Enceladus' uneven ice shell

  • Original language description

    We present a new model of Enceladus&apos; internal structure based on the recent shape model by Tajeddine et al. (2017) and the gravity model by Iess et al. (2014). Assuming that the rocky core is homogeneous and in hydrostatic equilibrium, we derive a set of structural models that accurately reproduce the main characteristics of Enceladus&apos; gravity field. In order to restrict the range of acceptable models we analyze the degree of compensation (ratio of the bottom to the surface load) at spherical harmonic degrees well constrained by the gravity data. In agreement with previous studies, we find that Enceladus&apos; ice shell is close to equilibrium, with the degree of compensation approaching one for models with a hydrostatic core having a radius between 190 km and 195 km. By computing the flow of ice driven by variations in hydrostatic pressure on the ice water/interface, we demonstrate that the ice shell is in steady state, as suggested by the gravity and shape data, only if the viscosity of ice at the melting temperature is equal to or higher than 3 x 10(14) Pa s, corresponding to diffusion creep with a grain size of 1 mm or larger. The topographic anomalies are maintained by phase changes at the ice/water interface with a melting/freezing rate of a few mm/yr or smaller. This process is controlled by the heat flux at the top of the ocean, characterized by a strong degree-2 zonal component with amplitudes exceeding 60 rnW/m(2) in both south and north polar regions.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10500 - Earth and related environmental sciences

Result continuities

  • Project

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2019

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Icarus

  • ISSN

    0019-1035

  • e-ISSN

  • Volume of the periodical

    319

  • Issue of the periodical within the volume

    2019

  • Country of publishing house

    US - UNITED STATES

  • Number of pages

    9

  • Pages from-to

    476-484

  • UT code for WoS article

    000455422800032

  • EID of the result in the Scopus database

    2-s2.0-85054729585