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AGU: Geophysical Research Letters

 

Index Terms

  • Atmospheric Composition and Structure: Middle atmosphere—energy deposition
  • Atmospheric Composition and Structure: Thermosphere—energy deposition
  • Meteorology and Atmospheric Dynamics: Theoretical modeling
  • Meteorology and Atmospheric Dynamics: Thermospheric dynamics
  • Meteorology and Atmospheric Dynamics: Waves and tides

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 30, 1789, 4 PP., 2003
doi:10.1029/2003GL017695

Day-to-day variations of migrating diurnal tide simulated by a GCM from the ground surface to the exobase

Yasunobu Miyoshi

Dept. of Earth and Planetary Sciences, Kyushu Univ., Fukuoka, Japan

Hitoshi Fujiwara

Dept. of Geophysics, Tohoku Univ., Sendai, Japan

A new general circulation model (GCM) which contains the region from the ground surface to the exobase has been developed and used to investigate behavior of the migrating diurnal tide for equinox during solar cycle minimum and geomagnetically quiet conditions. In particular, we study day-to-day variations of migrating diurnal tides in the mesosphere and thermosphere and their relation with migrating diurnal tides generated in the lower atmosphere. The results show that day-to-day variations of the migrating diurnal tide are evident from the upper troposphere to the thermosphere. Fluctuations of the migrating diurnal amplitude with periods of 12 and 25 days are found in the height range from 20 to 300 km, indicating dynamical coupling between the mesosphere and thermosphere and the lower atmosphere.

Received 7 May 2003; accepted 7 July 2003; published 2 August 2003.

Citation: Miyoshi, Y., and H. Fujiwara (2003), Day-to-day variations of migrating diurnal tide simulated by a GCM from the ground surface to the exobase, Geophys. Res. Lett., 30(15), 1789, doi:10.1029/2003GL017695.

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