Citation

Chunchuzov I, Kulichkov S, Popov O, Perepelkin V, Waxler R, Assink J. J. Acoust. Soc. Am. 2012; 132(3): 2073.

Affiliation

Obukhov Institute of Atmospheric Physics, 3 Pyzhevskii Per., Moscow 119017, Russian Federationigor.chunchuzov@gmail.com.

Copyright

(Copyright © 2012, American Institute of Physics)

DOI

10.1121/1.4755641

PMID

22979723

Abstract

The results of modeling infrasound propagation in the atmosphere from 100-t surface explosion in Israel, and volcano eruptions in Ecuador and Kamchatka are presented. The signal as a function of a range from a source is calculated by parabolic equation method for the vertical profile of wind velocity and temperature obtained from the Ground-to-Space atmospheric model. The effects of fine-scale layered structure of wind velocity and temperature fields on infrasound propagation in the atmosphere have been also taken into account. The one-dimensional (vertical and horizontal) wavenumber spectra of the wind and temperature fluctuations associated with the fine-scale structure are close to the observed spectra in the middle and upper atmosphere. The calculated wave forms, amplitudes and durations of the stratospheric and thermospheric arrivals are compared with those observed in the experiments. It is shown that the scattering of infrasonic signals by anisotropic fluctuations leads to a significant increase in the duration of the stratospheric and thermospheric arrivals in comparison with the case when these fluctuations are absent. The acoustic field scattered from anisotropic nonhomogenerities may be responsible for the arrivals of the acoustic pulses observed in the acoustic shadow zones.

Language: en