Evolution of tsunami-induced internal acoustic-gravity waves

Research output: Contribution to journalArticle

Abstract

The authors present an idealized theoretical and numerical study of tsunami-induced internal waves in the atmosphere. These are gravity waves modified by acoustic effects that can propagate rapidly from the ocean surface up to the ionosphere, where they are well known to leave a detectable fingerprint in airglow patterns and other remote sensing observables. Accurate modeling of the wave propagation is a prerequisite for being able to detect and decode this transient observational fingerprint by remote sensing methods. The authors study this problem by formulating the initial-value problem for linear waves forced by an idealized tsunami at the lower boundary and then employing a semianalytic Fourier-Laplace method to solve it. This approach allows them to compute the detailed time evolution of the waves while ensuring that the correct radiation condition in the vertical is satisfied at all times, a nontrivial matter for these transient waves. The authors also compare the predictions of an anelastic model with that of a fully compressible model in order to discern the importance of acoustic effects. The findings demonstrate that back-reflection at the tropopause is a significant factor for the structure of these waves and that the earliest observable signal in the ionosphere is, in fact, a fast acoustic precursor wave generated by the nearly impulsive formation of the tsunami itself.

Original languageEnglish (US)
Pages (from-to)2303-2317
Number of pages15
JournalJournal of the Atmospheric Sciences
Volume72
Issue number6
DOIs
StatePublished - 2015

Fingerprint

acoustic wave
tsunami
gravity wave
acoustics
ionosphere
remote sensing
airglow
tropopause
internal wave
wave propagation
sea surface
atmosphere
prediction
modeling
method
effect

Keywords

  • Atmospheric
  • Gravity waves
  • Stratophere-troposphere coupling
  • Waves

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Evolution of tsunami-induced internal acoustic-gravity waves. / Wei, Chen; Buhler, Oliver; Tabak, Esteban.

In: Journal of the Atmospheric Sciences, Vol. 72, No. 6, 2015, p. 2303-2317.

Research output: Contribution to journalArticle

@article{713bb17257994e5e9817b77561abb3b1,
title = "Evolution of tsunami-induced internal acoustic-gravity waves",
abstract = "The authors present an idealized theoretical and numerical study of tsunami-induced internal waves in the atmosphere. These are gravity waves modified by acoustic effects that can propagate rapidly from the ocean surface up to the ionosphere, where they are well known to leave a detectable fingerprint in airglow patterns and other remote sensing observables. Accurate modeling of the wave propagation is a prerequisite for being able to detect and decode this transient observational fingerprint by remote sensing methods. The authors study this problem by formulating the initial-value problem for linear waves forced by an idealized tsunami at the lower boundary and then employing a semianalytic Fourier-Laplace method to solve it. This approach allows them to compute the detailed time evolution of the waves while ensuring that the correct radiation condition in the vertical is satisfied at all times, a nontrivial matter for these transient waves. The authors also compare the predictions of an anelastic model with that of a fully compressible model in order to discern the importance of acoustic effects. The findings demonstrate that back-reflection at the tropopause is a significant factor for the structure of these waves and that the earliest observable signal in the ionosphere is, in fact, a fast acoustic precursor wave generated by the nearly impulsive formation of the tsunami itself.",
keywords = "Atmospheric, Gravity waves, Stratophere-troposphere coupling, Waves",
author = "Chen Wei and Oliver Buhler and Esteban Tabak",
year = "2015",
doi = "10.1175/JAS-D-14-0179.1",
language = "English (US)",
volume = "72",
pages = "2303--2317",
journal = "Journals of the Atmospheric Sciences",
issn = "0022-4928",
publisher = "American Meteorological Society",
number = "6",

}

TY - JOUR

T1 - Evolution of tsunami-induced internal acoustic-gravity waves

AU - Wei, Chen

AU - Buhler, Oliver

AU - Tabak, Esteban

PY - 2015

Y1 - 2015

N2 - The authors present an idealized theoretical and numerical study of tsunami-induced internal waves in the atmosphere. These are gravity waves modified by acoustic effects that can propagate rapidly from the ocean surface up to the ionosphere, where they are well known to leave a detectable fingerprint in airglow patterns and other remote sensing observables. Accurate modeling of the wave propagation is a prerequisite for being able to detect and decode this transient observational fingerprint by remote sensing methods. The authors study this problem by formulating the initial-value problem for linear waves forced by an idealized tsunami at the lower boundary and then employing a semianalytic Fourier-Laplace method to solve it. This approach allows them to compute the detailed time evolution of the waves while ensuring that the correct radiation condition in the vertical is satisfied at all times, a nontrivial matter for these transient waves. The authors also compare the predictions of an anelastic model with that of a fully compressible model in order to discern the importance of acoustic effects. The findings demonstrate that back-reflection at the tropopause is a significant factor for the structure of these waves and that the earliest observable signal in the ionosphere is, in fact, a fast acoustic precursor wave generated by the nearly impulsive formation of the tsunami itself.

AB - The authors present an idealized theoretical and numerical study of tsunami-induced internal waves in the atmosphere. These are gravity waves modified by acoustic effects that can propagate rapidly from the ocean surface up to the ionosphere, where they are well known to leave a detectable fingerprint in airglow patterns and other remote sensing observables. Accurate modeling of the wave propagation is a prerequisite for being able to detect and decode this transient observational fingerprint by remote sensing methods. The authors study this problem by formulating the initial-value problem for linear waves forced by an idealized tsunami at the lower boundary and then employing a semianalytic Fourier-Laplace method to solve it. This approach allows them to compute the detailed time evolution of the waves while ensuring that the correct radiation condition in the vertical is satisfied at all times, a nontrivial matter for these transient waves. The authors also compare the predictions of an anelastic model with that of a fully compressible model in order to discern the importance of acoustic effects. The findings demonstrate that back-reflection at the tropopause is a significant factor for the structure of these waves and that the earliest observable signal in the ionosphere is, in fact, a fast acoustic precursor wave generated by the nearly impulsive formation of the tsunami itself.

KW - Atmospheric

KW - Gravity waves

KW - Stratophere-troposphere coupling

KW - Waves

UR - http://www.scopus.com/inward/record.url?scp=84943425974&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84943425974&partnerID=8YFLogxK

U2 - 10.1175/JAS-D-14-0179.1

DO - 10.1175/JAS-D-14-0179.1

M3 - Article

AN - SCOPUS:84943425974

VL - 72

SP - 2303

EP - 2317

JO - Journals of the Atmospheric Sciences

JF - Journals of the Atmospheric Sciences

SN - 0022-4928

IS - 6

ER -