Excitation mechanism of intraseasonal oscillation in the equatorial mesosphere and lower thermosphere

Y. Miyoshi, H. Fujiwara

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55 Citations (Scopus)

Abstract

By using a general circulation model, excitation mechanism of intraseasonal oscillation of the zonal mean zonal wind in the equatorial mesosphere and lower thermosphere (MLT) is investigated. Out results show that wave-mean flow interaction with ultrafast Kelvin waves and diurnal tides is important for driving the intraseasonal oscillation. Not only the migrating diurnal tide but also the nonmigrating, diurnal tide plays an important role in excitation of the intraseasonal oscillation. Intraseasonal variations of amplitudes of the ultrafast Kelvin waves and the diurnal tides are found at height range from 20 to 90 km heights, indicating dynamical coupling between the MLT region and the lower atmosphere. Intraseasonal variations of amplitudes of these waves and their relations with the tropospheric intraseasonal oscillation are discussed.

Original languageEnglish
Article numberD14108
JournalJournal of Geophysical Research Atmospheres
Volume111
Issue number14
DOIs
Publication statusPublished - Jul 27 2006

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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