JpGU Fellowship

Toshitaka Tsuda


For outstanding contributions to the study of atmospheric vertical coupling by developing novel atmospheric remote sensing techniques and to the development of international collaboration

A list of five major papers

  • Tsuda, T., T. Inoue, D. C. Fritts, T. E. VanZandt, S. Kato, T. Sato, and S. Fukao, MST radar observations of a saturated gravity wave spectrum, J. Atmos. Sci., 46, 2440-2447, 1989.
  • Tsuda, T., Y. Murayama, M. Yamamoto, S. Kato, and S. Fukao, Seasonal variation of momentum flux in the mesosphere observed with the MU radar, Geophys. Res. Lett., 17, 725-728, 1990.
  • Tsuda, T., Y. Murayama, H. Wiryosumarto, S. Woro B. Harijono, and S. Kato, Radiosonde observations of equatorial atmosphere dynamics over Indonesia, Part I: Equatorial waves and diurnal tides, J. Geophys. Res., 99, 10491-10505, 1994.
  • Tsuda, T., M. Nishida, C. Rocken and R. H. Ware, A global morphology of gravity wave activity in the stratosphere revealed by the GPS occultation data (GPS/MET), J. Geophys. Res. – Atmospheres, 105, 7257-7273, 2000.
  • Tsuda, T., Characteristics of atmospheric gravity waves observed using the MU (Middle and Upper atmosphere) radar and GPS (Global Positioning System) radio occultation, Proceedings of the Japan Academy, Series B, Physical and Biological Sciences, 90, 12-27, 2014.

Major achievements

Dr. Toshitaka Tsuda advanced research on atmospheric waves by developing various wind velocity, temperature and water vapor measurement techniques such as meteor radar, the middle and upper atmosphere radar (the MU radar), RASS temperature observation, and GPS occultation mission. In particular, he was the first to estimate the momentum flux due to atmospheric gravity waves, and showed the essential importance of dynamic vertical coupling of the atmosphere through atmospheric waves. He realized field observations in the equatorial region of Indonesia. He also studied atmospheric waves with radiosondes and found that the tropical tropopause fluctuates greatly under the influence of Kelvin waves, and demonstrated that atmospheric gravity waves in the stratosphere are related to quasi-biennial oscillations (QBO) of background east-west winds. Furthermore, he clarified the global distribution of atmospheric gravity waves and ionospheric disturbances using GPS radio occultation data for the first time in the world, contributing greatly to the establishment of GPS meteorology. Thus, in atmospheric science research based on the development of atmospheric remote sensing technology, he has produced research results that will have a lasting impact both domestically and internationally. In addition, he has made notable contributions in exercising leadership in international research programs and established a close collaboration of the Japanese geoscience community with the US, Asian and European geoscience communities.


Mamoru Yamamoto


Ryoichi Fujii, Kaoru Sato, Takuji Nakamura