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Yasunobu Miyoshi Last modified date:2016.09.27

Associate Professor / Earth Planetary Fluid and Space Sciences
Department of Earth and Planetary Sciences
Faculty of Sciences


Graduate School
Undergraduate School
Other Organization


Academic Degree
Doctor of Science
Field of Specialization
Middle Atmosphere Sciences
Outline Activities
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
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
Papers
1. Yasunobu Miyoshi, Hitoshi Fujiwara, Hidekatsu Jin, Hiroyuki Shinagawa, A global view of gravity waves in the thermosphere simulated by a general circulation model, J. Geophys. Res., 119, 2014.06.
2. Jin, H., Y. Miyoshi, H. Fujiwara, H. Shinagawa, K. Terada, N. Terada, M. Ishii, Y. Otsuka, and A. Saito, Vertical connection from the tropospheric activities to the ionospheric longitudinal structure simulated by a new Earth's whole atmosphere-ionosphere coupled model, Journal of Geophysical Research, 116, A01, A01316, 2011.01.
3. Y. Miyoshi, and H. Fujiwara, J. M. Forbes and S. Bruinsma, Solar terminator wave and its relation to the atmospheric tide, Journal of Geophysical Research, 114, A07303, A07303, 2009.07.
4. Yasunobu Miyoshi and Hitoshi Fujiwara, Gravity waves in the thermosphere simulated by a general circulation model, Journal of Geophysical Research, Vol. 113, D01101, doi:10.1029/2007JD008874, 2008.01.
5. Yasunobu Miyoshi, Hitoshi Fujiwara, Excitation mechanism of intraseasonal oscillation in the mesosphere and lower thermosphere, Journal of Geopgysical Research, Vol. 111, D14108, doi:10.1029/2005JD006993, 2006.07.
6. Yasunobu Miyoshi and Hitoshi Fujiwara, Day-to-day variations of migrating diurnal tide simulated by a GCM from the ground surface to the exobase, Geophysical Research Letters, 30, 15, Vol. 30, 1789, doi:10.1029/2003GL017695., 2003.08.
7. Yasunobu Miyoshi, Numerical simulation of the 5-day and 16-day waves in the mesopause region, Earth, Planets and Space, 51, 7-8, Vol. 51, Page 763-772., 1999.07.
8. Yasunobu Miyoshi and Toshihiko Hirooka, A numerical experiment of excitation of the 5-day wave by a GCM, Journal of Atmospheric Sciences, 56, 11, Vol. 56, Page 1698-1707., 1999.06.
Presentations
1. Upward Propagation of Atmospheric Waves from the troposphere to the thermosphere and its Impact on the General Circulation in the Thermosphere,.
2. Upward propagation of atmospheric waves and its impact on the general circulation in the thermosphere.
Membership in Academic Society
  • AGU
Awards
  • Development of a whole atmosphere model and its application to couplling processes of the atmopshere between the lower and upper atmosphere
Educational