Resonant Tidal Responses in Rotating Fluid Bodies: Global Modes Hidden beneath Localized Wave Beams

Lin, Yufeng1; Ogilvie, Gordon, I2

2021-09-01

10.3847/2041-8213/ac1f23

Astrophysical Journal Letters   影响因子和分区

2041-8205

2041-8213

In rotating stars and planets, excitation of inertial waves in convective envelopes provides an important channel for tidal dissipation, but the dissipation rate due to inertial waves depends erratically on the tidal frequency. Tidal dissipation is significantly enhanced at some frequencies, suggesting possible resonances between the tidal forcing and some eigenmodes. However, the nature of these resonances remains enigmatic owing to the singularity of the eigenvalue problem of inertial waves, and the resonances are often mistakenly attributed to wave attractors in the literature. In this Letter, we reveal that resonant tidal responses correspond to inertial modes with large-scale flows hidden beneath localized wave beams. Strong couplings between the tidal forcing and the hidden large-scale flows intensify the localized wave beams emanating from the critical latitudes, leading to enhanced tidal dissipation. This study resolves a longstanding puzzle regarding the frequency dependence of tidal dissipation due to inertial waves in convective envelopes.

SCI

英语

NI期刊

第一 ; 通讯

B-type Strategic Priority Program of the CAS[XDB41000000] ; pre-research project on Civil Aerospace Technologies of CNSA[D020308]

Astronomy & Astrophysics

Astronomy & Astrophysics

WOS:000692252300001

IOP PUBLISHING LTD

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen 518055, Peoples R China
2.Univ Cambridge, Ctr Math Sci, Dept Appl Math & Theoret Phys, Wilberforce Rd, Cambridge CB3 0WA, England

Lin, Yufeng,Ogilvie, Gordon, I. Resonant Tidal Responses in Rotating Fluid Bodies: Global Modes Hidden beneath Localized Wave Beams[J]. Astrophysical Journal Letters,2021,918(1).

Lin, Yufeng,&Ogilvie, Gordon, I.(2021).Resonant Tidal Responses in Rotating Fluid Bodies: Global Modes Hidden beneath Localized Wave Beams.Astrophysical Journal Letters,918(1).

Lin, Yufeng,et al."Resonant Tidal Responses in Rotating Fluid Bodies: Global Modes Hidden beneath Localized Wave Beams".Astrophysical Journal Letters 918.1(2021).