A nonlinear simulation of the thermal diurnal tide

Deng Hua Wu, S. Miyahara, Yasunobu Miyoshi

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21 Citations (Scopus)

Abstract

A simplified middle atmosphere general circulation model is used to investigate the nonlinear behavior of the thermal diurnal tidal waves. In the model, only a westward moving diurnal tide generated by heating with zonal wavenumber 1 is considered. The tidal wave propagation is simulated by a full nonlinear calculation with a convective adjustment scheme and a Richardson number dependent vertical eddy diffusion. The numerical results show that the growth of the diurnal tide due to the density stratification is effectively suppressed and a relatively constant amplitude distribution with height is realized by the convective adjustment in the lower thermosphere. It is also shown that mean zonal winds and mean meridional circulations are induced by the diurnal tidal waves in the region where the tidal waves are breaking by convective instability, in accordance with the wave-mean flow interaction theorem.

Original languageEnglish
Pages (from-to)1017-1030
Number of pages14
JournalJournal of Atmospheric and Terrestrial Physics
Volume51
Issue number11-12
DOIs
Publication statusPublished - Jan 1 1989

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Geophysics
  • Engineering(all)
  • Atmospheric Science
  • Earth and Planetary Sciences(all)

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