Comparisons of linear and nonlinear numerical models of acoustic-gravity wave propagation in the middle and upper atmosphere.

Николай Михайлович Гаврилов, Никита Олегович Шевчук, Сергей Петрович Кшевецкий, Александр Иванович Погорельцев

Research output: Contribution to journalMeeting Abstractpeer-review

Abstract

According to present knowledge, acoustic-gravity waves (AGWs) observed in the upper atmosphere may arise near the Earth surface due to different sources and propagate upwards. Algorithms for two- and three-dimensional numerical simulation of vertical propagation and breaking of nonlinear AGWs from the Earth’s surface to the upper atmosphere were developed recently. The algorithms of the solution of fluid dynamic equations use finite-difference analogues of basic conservation laws. This approach allows us to select physically correct generalized wave solutions of the nonlinear equations. Horizontally moving periodical horizontal sinusoidal structures of vertical velocity on the Earth’s surface serve as AGW sources in the model. Numerical simulation was made in a region of the Earth atmosphere with dimensions up to several thousand kilometers horizontally and 500 km vertically. Vertical profiles of the mean temperature, density, molecular viscosity and thermal conductivity correspond to standard models of the a
Original languageEnglish
Pages (from-to)1127
JournalGeophysical Research Abstracts
Volume17
Issue numberEGU2015
StatePublished - 2015
EventEuropean Geosciences Union General Assembly 2015 - Vienna, Austria
Duration: 11 Apr 201516 Apr 2015
http://egu2015.eu/

Scopus subject areas

  • Earth and Planetary Sciences(all)

Keywords

  • атмосфера
  • динамика
  • акустико-гравитационные волны
  • моделирование

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