Tidal resonance in icy satellites with subsurface oceans

Shunichi Kamata, Isamu M Matsuyama, Francis Nimmo

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Tidal dissipation is a major heat source for the icy satellites of the giant planets. Several icy satellites likely possess a subsurface ocean underneath an ice shell. Previous studies of tidal dissipation on icy satellites, however, have either assumed a static ocean or ignored the effect of the ice lid on subsurface ocean dynamics. In this study, we examine inertial effects on tidal deformation of satellites with a dynamic ocean overlain by an ice lid based on viscoelasto-gravitational theory. Although ocean dynamics is treated in a simplified fashion, we find a resonant configuration when the phase velocity of ocean gravity waves is similar to that of the tidal bulge. This condition is achieved when a subsurface ocean is thin (2 and k2 Love numbers) near the resonant configuration would lead to enhanced tidal heating in the solid lid. A static ocean formulation gives an accurate result only if the ocean thickness is much larger than the resonant thickness. The resonant configuration strongly depends on the properties of the shell, demonstrating the importance of the presence of a shell on tidal dissipation.

Original languageEnglish (US)
Pages (from-to)1528-1542
Number of pages15
JournalJournal of Geophysical Research: Space Physics
Volume120
Issue number9
DOIs
StatePublished - Sep 1 2015

Fingerprint

icy satellites
oceans
Ice
ocean dynamics
Satellites
ocean
ice
dissipation
Gravity waves
Phase velocity
Water waves
Planets
shell
configurations
gravity waves
heat sources
phase velocity
Heating
planets
ocean wave

Keywords

  • icy satellites
  • resonance
  • subsurface ocean
  • tidal deformation

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Tidal resonance in icy satellites with subsurface oceans. / Kamata, Shunichi; Matsuyama, Isamu M; Nimmo, Francis.

In: Journal of Geophysical Research: Space Physics, Vol. 120, No. 9, 01.09.2015, p. 1528-1542.

Research output: Contribution to journalArticle

Kamata, Shunichi ; Matsuyama, Isamu M ; Nimmo, Francis. / Tidal resonance in icy satellites with subsurface oceans. In: Journal of Geophysical Research: Space Physics. 2015 ; Vol. 120, No. 9. pp. 1528-1542.
@article{2470ff7fd94f4d72b646a7b62b8fe547,
title = "Tidal resonance in icy satellites with subsurface oceans",
abstract = "Tidal dissipation is a major heat source for the icy satellites of the giant planets. Several icy satellites likely possess a subsurface ocean underneath an ice shell. Previous studies of tidal dissipation on icy satellites, however, have either assumed a static ocean or ignored the effect of the ice lid on subsurface ocean dynamics. In this study, we examine inertial effects on tidal deformation of satellites with a dynamic ocean overlain by an ice lid based on viscoelasto-gravitational theory. Although ocean dynamics is treated in a simplified fashion, we find a resonant configuration when the phase velocity of ocean gravity waves is similar to that of the tidal bulge. This condition is achieved when a subsurface ocean is thin (2 and k2 Love numbers) near the resonant configuration would lead to enhanced tidal heating in the solid lid. A static ocean formulation gives an accurate result only if the ocean thickness is much larger than the resonant thickness. The resonant configuration strongly depends on the properties of the shell, demonstrating the importance of the presence of a shell on tidal dissipation.",
keywords = "icy satellites, resonance, subsurface ocean, tidal deformation",
author = "Shunichi Kamata and Matsuyama, {Isamu M} and Francis Nimmo",
year = "2015",
month = "9",
day = "1",
doi = "10.1002/2015JE004821",
language = "English (US)",
volume = "120",
pages = "1528--1542",
journal = "Journal of Geophysical Research: Space Physics",
issn = "2169-9380",
publisher = "Wiley-Blackwell",
number = "9",

}

TY - JOUR

T1 - Tidal resonance in icy satellites with subsurface oceans

AU - Kamata, Shunichi

AU - Matsuyama, Isamu M

AU - Nimmo, Francis

PY - 2015/9/1

Y1 - 2015/9/1

N2 - Tidal dissipation is a major heat source for the icy satellites of the giant planets. Several icy satellites likely possess a subsurface ocean underneath an ice shell. Previous studies of tidal dissipation on icy satellites, however, have either assumed a static ocean or ignored the effect of the ice lid on subsurface ocean dynamics. In this study, we examine inertial effects on tidal deformation of satellites with a dynamic ocean overlain by an ice lid based on viscoelasto-gravitational theory. Although ocean dynamics is treated in a simplified fashion, we find a resonant configuration when the phase velocity of ocean gravity waves is similar to that of the tidal bulge. This condition is achieved when a subsurface ocean is thin (2 and k2 Love numbers) near the resonant configuration would lead to enhanced tidal heating in the solid lid. A static ocean formulation gives an accurate result only if the ocean thickness is much larger than the resonant thickness. The resonant configuration strongly depends on the properties of the shell, demonstrating the importance of the presence of a shell on tidal dissipation.

AB - Tidal dissipation is a major heat source for the icy satellites of the giant planets. Several icy satellites likely possess a subsurface ocean underneath an ice shell. Previous studies of tidal dissipation on icy satellites, however, have either assumed a static ocean or ignored the effect of the ice lid on subsurface ocean dynamics. In this study, we examine inertial effects on tidal deformation of satellites with a dynamic ocean overlain by an ice lid based on viscoelasto-gravitational theory. Although ocean dynamics is treated in a simplified fashion, we find a resonant configuration when the phase velocity of ocean gravity waves is similar to that of the tidal bulge. This condition is achieved when a subsurface ocean is thin (2 and k2 Love numbers) near the resonant configuration would lead to enhanced tidal heating in the solid lid. A static ocean formulation gives an accurate result only if the ocean thickness is much larger than the resonant thickness. The resonant configuration strongly depends on the properties of the shell, demonstrating the importance of the presence of a shell on tidal dissipation.

KW - icy satellites

KW - resonance

KW - subsurface ocean

KW - tidal deformation

UR - http://www.scopus.com/inward/record.url?scp=84945237198&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84945237198&partnerID=8YFLogxK

U2 - 10.1002/2015JE004821

DO - 10.1002/2015JE004821

M3 - Article

AN - SCOPUS:84945237198

VL - 120

SP - 1528

EP - 1542

JO - Journal of Geophysical Research: Space Physics

JF - Journal of Geophysical Research: Space Physics

SN - 2169-9380

IS - 9

ER -