Seasonal variation of non-migrating semidiurnal tide in the polar MLT region in a general circulation model

K. Yamashita, S. Miyahara, Yasunobu Miyoshi, K. Kawano, J. Ninomiya

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Abstract

Behavior of semidiurnal tides in the north and south polar MLT regions simulated by Middle Atmosphere Circulation Model at Kyushu University is described. Summertime enhancement of westward propagating semidiurnal tide with zonal wavenumber s = 1 is found, which is consistent with the observed result at the South Pole (Ann. Geophys. 16 (1998) 828). Additional numerical simulations show that the non-migrating semidiurnal tide is mainly generated by the nonlinear interactions between stationary planetary waves with zonal wavenumber s = 1 and the migrating semidiurnal tide in the stratosphere and mesosphere as suggested by Forbes et al. (Geophys. Res. Lett. 22(23) (1995) 3247).

Original languageEnglish
Pages (from-to)1083-1094
Number of pages12
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume64
Issue number8-11
DOIs
Publication statusPublished - Jul 30 2002

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science

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