Doctor of Science

Middle Atmosphere Sciences

Outline of research
　My　research activities are summarized as follows:
(1) A study of the atmospheric waves and the general circulation of the atmosphere in the mesosphere and thermosphere.
(2) A study of mechanisms of long period oscillation in low latitudes of the middle atmosphere.
(3) A study of excitation mechanisms of normal mode Rossby waves.
(4) A study of effects of solar activity on the general circulation in the middle atmosphere.

Outline of education
I lecture undergraduate and graduate students on earth and planetary sciences. I guide undergraduate and graduate students in their bachelar thesis, master thesis and doctor thesis.

Research Interests

• Effects of solar activity on the variability of the general circulation of the middle atmosphere
  keyword : variability of the general circulation, solar activity, middle atmosphere
  2001.11Effects of the variability of the solar activity with about 11 years and 27 days periods on the general circulation in the middle atmosphere are invesigated by using a general circulation model. In particular, I pay attention on the variability of the temperature and the meridional circulation in the upper mesosphere and lower thermosphere. Moreover, effects of the variability of the solar activity on planetary scale wave activities through are exmained..
• Excitation mechanism of normal mode Rossby waves
  keyword : Normal mode Rossby waves, Rossby Wave, Excitation mechanism
  1995.04I investigate excitation mechanisms of Normal mode Rossby waves, such as the 2-day, 5-day, 10-day 16-day waves, which is frequently observed in the stratosphere and mesosphere. By using observational data, appearance periods of the normal mode Rossby waves and its relations with the quasi-biennial oscillation in the lower stratosphere and long period variations of the general circulation in the troposphere are examined. Moreover, by using a general circulation model, effects of lower boundary conditions on excitation of the normal mode Rossby waves are examined..
• Excitation mechanism of long period oscillations in the low latitudes middle atmosphere
  keyword : long period oscillations, middle atmosphere, low latitudes region
  2000.04I investigate excitation mechanisms of semiannual oscillation (SAO) and quasi-biennial oscillation (QBO) in low latitudes of the middle atmosphere (the stratosphere, mesosphere and lower thermosphere). In particular, the behavior of the SAO in the upper mesosphere, and its relation with the SAO in the upper stratosphere are examined. These reserches are performed by using numerical models and observational data..
• atmospheric wavea and general circulation in the stratosphere, mesosphere and thermosphere
  keyword : atmospheric waves, general circulation of the atmosphere, numerical model
  1990.04By using a general circulation model, whichb is one of sumerical simulation models, I investigate the behavior of the atmospheric waves in the stratosphere, mesosphere and thermosphere. In particular, I pay my attention to the behavior of planetray scale waves, such as the Rossby wave, tides and the Kelvin wave. Effects of the atmospheric waves on the general ciculation of the atmosphere in the stratosphere, mesosphere and thermosphere are also investigated..

Current and Past Project

• In order to investigate mechanisms of ozone losses in the stratosphere, we develop a new general ciculation model, which includes schmes for photochemistry of ozone and effects of ozone transport by dynamics. By numrical simulation with the new general ciculation model, year-to-year variations of the stratospheric ozone are examined. The relationship between interannual variations of the stratospheric ozone and interannual variations of planetary wave activities are investigated.

Academic Activities Membership in Academic Society

• AGU

Awards

• Simulation study of atmospheric vertical coupling processes through atmospheric waves
• Development of a whole atmosphere model and its application to couplling processes of the atmopshere between the lower and upper atmosphere

Educational Activities