Atmospheric resonances and their coupling to vibrations of the ground and waves in the ocean
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Authors
Godin, Oleg A.
Zabotin, Nikolay
Zabotina, Liudmila
Subjects
Acoustic-gravity waves
Infragravity waves
Air–sea interaction
Ionosphere
Normal modes
Infragravity waves
Air–sea interaction
Ionosphere
Normal modes
Advisors
Date of Issue
2020
Date
Publisher
Springer
Language
Abstract
Observations of the ionosphere with the airglow, GPS-TEC, and HF radar techniques reveal a resonant response of the middle and upper atmosphere to broad-band excitation by earthquakes, volcano eruptions, and convective storms. The resonances occur at such frequencies that an atmospheric wave, which is radiated at the ground level and is reflected from a turning point in the middle or upper atmosphere, upon return to the ground level satisfies boundary conditions on the ground. Using asymptotic and numerical models of atmospheric waves, this paper investigates atmospheric resonances and their excitation by seismic waves and infragravity waves in the ocean. It is found that “buoyancy” resonances with periods up to several hours arise in addition to “acoustic” resonances with periods of about 3–5 min. The acoustic and buoyancy resonances occur, respectively, on the acoustic and gravity branches of the dispersion curve of acoustic-gravity waves. Buoyancy of the atmosphere is important for the resonances of both kinds. Acoustic resonances are found to be sensitive to the temperature profile, especially around mesopause and tropopause, and are predicted to be a seasonal phenomenon in polar atmosphere. Unlike acoustic resonances, buoyancy resonances exhibit high sensitivity to the wind velocity profile and its variations. The resonances correspond to most efficient coupling between the atmosphere and its lower boundary and are promising for detection of such coupling.
Type
Article
Description
The article of record as published may be found at https://doi.org/10.1186/s40623-020-01260-9
Series/Report No
Department
Physics
Organization
Identifiers
NPS Report Number
Sponsors
Funder
Format
19 p.
Citation
Godin, Oleg A., Nikolay A. Zabotin, and Liudmila Zabotina. "Atmospheric resonances and their coupling to vibrations of the ground and waves in the ocean." Earth, Planets and Space 72.1 (2020): 1-19.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.