Professor Masahiro Takagi

Area and Subject Taught Planetary Meteorology
Research Theme(s) Dynamics and radiative transfer process of the Venus atmosphere
Academic Degrees Ph. D., University of Tokyo
Keywords for Research Field Planetary Meteorology
Office Phone Number 075-705-1714
e-mail E-mail

Research Overview

Most planets in the solar system have atmospheres. In those atmospheres, various phenomena which are completely different from those in the terrestrial atmosphere have been observed. It is well known that the Venus atmosphere rotates much faster than the Venus rotation. This fast zonal flow is called “superrotation”.However, the generation and maintaining mechanism of the superrotation remains unknown. I am conducting theoretical study on the Venus atmosphere in order to elucidate the mechanism of the Venus atmospheric superrotation. I am also developing the cloud tracking method by which wind distributions can be estimated accurately from Venus cloud images.

Notable Publications and Works in the Last Three Years

  • Horinouchi, T., T. Kouyama, Y.-J. Lee, S. Murakami, K. Ogohara, M. Takagi, T. Imamura, K. Nakajima, J. Peralta, A. Yamazaki, M. Yamada, and S. Watanabe (2018), Mean winds at the cloud top of Venus obtained from two-wavelength UV imaging by Akatsuki, Earth, Planets and Space, 70:10, doi:10.1186/s40623-017-0775-3.
  • Takagi M., N. Sugimoto, H. Ando, and Y. Matsuda (2018), Three dimensional structures of thermal tides simulated by a Venus GCM, J. Geophys. Res., 123, doi:10.1002/2017JE005449.
  • Ogohara, K., M. Takagi, S. Murakami, T. Horinouchi, M. Yamada, T. Kouyama, G.L. Hashimoto, T. Imamura, Y. Yamamoto, H. Kashimura, N. Hirata, N. Sato, A. Yamazaki, T. Satoh, N. Iwagami, M. Taguchi, S. Watanabe, T.M. Sato, S. Ohtsuki, T. Fukuhara, M. Futaguchi, T. Sakanoi, S. Kameda, K. Sugiyama, H. Ando, Y.J. Lee, M. Nakamura, M. Suzuki, C. Hirose, N. Ishii, T. Abe (2017), Earth, Planets and Space, 69:167, doi:10.1186/s40623-017-0749-5.
  • Kouyama, T., T. Imamura, M. Taguchi, T. Fukuhara, T. M. Sato, A. Yamazaki, M. Futaguchi, S. Murakami, G. L. Hashimoto, M. Ueno, N. Iwagami, S. Takagi, M. Takagi, K. Ogohara, H. Kashimura, T. Horinouchi, N. Sato, M. Yamada, Y. Yamamoto, S. Ohtsuki, K. Sugiyama, H. Ando, M. Takamura, T. Yamada, T. Satoh, and M. Nakamura (2017), Topographical and local time dependence of large stationary gravity waves observed at the cloud top of Venus, Geophys. Res. Lett., 44, doi:10.1002/2017GL075792.
  • Horinouchi, T., S. Murakami, T. Satoh, J. Peralta, K. Ogohara, T. Kouyama, T. Imamura, H. Kashimura, S.S. Limaye, K. McGouldrick, M. Nakamura, T.M. Sato, K. Sugiyama, M. Takagi, S. Watanabe, M. Yamada, A. Yamazaki, and E.F. Young, (2017), Nat. Geosci., 10, 646-651, doi:10.1038/NGEO3016.
  • Sugimoto, N., A. Yamazaki, T. Kouyama, H. Kashimura, T. Enomoto, and M. Takagi (2017), Development of an ensemble Kalman filter data assimilation system for the Venusian atmosphere, Sci. Rep., 7:9321, doi:10.1038/s41598-017-09461-1.
  • 村上真也, 山本幸生, はしもとじょーじ, 山田学, 山崎敦, 佐藤隆雄, 小郷原一智, 髙木征弘, Kevin McGouldrick, 平田成 (2017), 一番星へ行こう! 日本の金星探査機の挑戦 その32 〜データアーカイブ〜, 日本惑星科学会誌「遊・星・人」, 26, 92-96.
  • Nakamura, M., T. Imamura, N. Ishii, T. Abe, Y. Kawakatsu, C. Hirose, T. Satoh, M. Suzuki, M. Ueno, A. Yamazaki, N. Iwagami, S. Watanabe, M. Taguchi, T. Fukuhara, Y. Takahashi, M. Yamada, M. Imai, S. Ohtsuki, K. Uemizu, G. L. Hashimoto, M. Takagi, Y. Matsuda, K. Ogohara, N. Sato, Y. Kasaba, T. Kouyama, N. Hirata, R. Nakamura, Y. Yamamoto, T. Horinouchi, M. Yamamoto, Y.-Y. Hayashi, H. Kashimura, K. Sugiyama, T. Sakanoi, H. Ando, S. Murakami, T. M. Sato, S. Takagi, K. Nakajima, J. Peralta, Y. J. Lee, J. Nakatsuka, T. Ichikawa, K. Inoue, T. Toda, H. Toyota, S. Tachikawa, S. Narita, T. Hayashiyama, A. Hasegawa, and Y. Kamata (2016), AKATSUKI returns to Venus, Earth, Planets and Space, 68:75, doi:10.1186/s40623-016-0457-6.
  • Ando, H., N. Sugimoto, M. Takagi, H. Kashimura, T. Imamura, Y. Matsuda (2016), The puzzling Venusian polar atmospheric structure reproduced by a general circulation model, Nat. Commun., 7:10398, doi:10.1038/ncomms10398.