| Kensuke Nakajima | Last modified date：2023.11.27 |
Associate Professor /
Earth Planetary Fluid and Space Sciences /
Department of Earth and Planetary Sciences /
Faculty of Sciences
Papers
| 1. | Nishikawa, Yasuhiro; Yamamoto, Masa-yuki; Nakajima, Kensuke; Hamama, Islam; Saito, Hiroaki; Kakinami, Yoshihiro; Yamada, Masumi; Ho, Tung-Cheng, Observation and simulation of atmospheric gravity waves exciting subsequent tsunami along the coastline of Japan after Tonga explosion event, SCIENTIFIC REPORTS, 10.1038/s41598-022-25854-3, 12, 1, 2022.12, [URL], Tsunamis are commonly generated by earthquakes beneath the ocean floor, volcanic eruptions, and landslides. The tsunami following the Tonga eruption of 2022 is believed to have been excited by atmospheric pressure fluctuations generated by the explosion of the volcano. The first, fast-traveling tsunami was excited by Lamb waves; however, it has not been clarified observationally or theoretically which type of atmospheric fluctuations excited more prominent tsunami which followd. In this study, we investigate atmospheric gravity waves that possibly excited the aforementioned subsequent tsunami based on observations and atmosphere-ocean coupling simulations. The atmospheric fluctuations are classified as Lamb waves, acoustic waves, or gravity waves. The arrival time of the gravity wave and the simulation shows that the gravity wave propagated at a phase speed of 215 m/s, coinciding with the tsunami velocity in the Pacific Ocean, and suggesting that the gravity wave resonantly excited the tsunami (Proudman resonance). These observations and theoretical calculations provide an essential basis for investigations of volcano-induced meteotsunamis, including the Tonga event.. |
| 2. | Yoshihiro Kakinami, Hiroaki Saito, Tetsuo Yamamoto, Chia-Hung Chen, Masa-yuki Yamamoto, Kensuke Nakajima, Jann-Yenq Liu, Shigeto Watanabe , Onset Altitudes of Co-Seismic Ionospheric Disturbances Determined by Multiple Distributions of GNSS TEC After the Foreshock of the 2011 Tohoku Earthquake on March 9, 2011, EARTH AND SPACE SCIENCE, 10.1029/2020EA001217, 8, 8, 2021.08, [URL]. |
| 3. | M. Ishiwatari, K. Nakajima, S. Takehiro, Y.-Y. Hayashi, Y. Kawai, Y. O. Takahashi, Revision of “Dependence of Climate States of Gray Atmosphere on Solar Constant: From the Runaway Greenhouse to the Snowball States” by Ishiwatari et al. (2007), Journal of Geophysical Research: Atmospheres, https://doi.org/10.1029/2019JD031761, 126, 11, 2021.04, [URL]. |
| 4. | Hiroaki Saito, Tetsuo Yamamoto, Kensuke Nakajima, Kiyoshi Kuramoto, and Masa-yuki Yamamoto, Identification of the infrasound signals emitted by explosive eruption of Mt. Shinmoedake by three-dimensional ray tracing, The Journal of the Acoustical Society of America, https://doi.org/10.1121/10.0003366, 149, 1, 2021.01, [URL]. |
| 5. | Yuta Nakagawa, Takanori Kodama, Masaki Ishiwatari, Hajime Kawahara, Yasushi Suto, Yoshiyuki O. Takahashi, George L. Hashimoto, Kiyoshi Kuramoto, Kensuke Nakajima, Shin-ichi Takehiro, and Yoshi-Yuki Hayashi, Obliquity of an Earth-like Planet from Frequency Modulation of Its Direct-imaged Lightcurve: Mock Analysis from General Circulation Model Simulation, The Astrophysical Journal, doi.org/10.3847/1538-4357/ab9eb8, 898, 2, Article id 95, 2020.07, [URL]. |
| 6. | Hiroki Tsuji, Kensuke Nakajima, Relationship Between the Change in Size of Tropical Cyclones and Spatial Patterns of Precipitation, Journal of Geophysical Research: Atmospheres, https://doi.org/10.1029/2019JD030404, 2019.08, [URL]. |
| 7. | Hiroki Kashimura, Norihiko Sugimoto, Masahiro Takagi, Yoshihisa Matsuda, Wataru Ohfuchi, Takeshi Enomoto, Kensuke Nakajima, Masaki Ishiwatari, Takao M. Sato, George L. Hashimoto, Takehiko Satoh, Yoshiyuki O. Takahashi & Yoshi-Yuki Hayashi , Planetary-scale streak structure reproduced in high-resolution simulations of the Venus atmosphere with a low-stability layer, Nature Communications, doi:10.1038/s41467-018-07919-y, 70:10, 2019.01, [URL]. |
| 8. | Takeshi Horinouchi, Toru Kouyama, Yeon Joo Lee, Shin-ya Murakami, Kazunori Ogohara, Masahiro Takagi, Takeshi Imamura, Kensuke Nakajima, Javier Peralta, Atsushi Yamazaki, Manabu Yamada, Shigeto Watanabe, Mean winds at the cloud top of Venus obtained from two-wavelength UV imaging by Akatsuki, Earth Planets and Space, 10.1186/s40623-017-0775-3, 70:10, 2018.01, [URL]. |
| 9. | S.Noda, M.Ishiwatari, K.Nakajima, Y.O.Takahashi, S.Takehiro, M.Onishi, G.L.Hashimoto, K.Kuramoto, Y.-Y.Hayashi, The circulation pattern and day-night heat transport in the atmosphere of a synchronously rotating aquaplanet: Dependence on planetary rotation rate, ICARUS, 10.1016/j.icarus.2016.09.004, 1, 1-18, 2017.01, [URL]. |
| 10. | Hiroki Tsuji, Hisanori Itoh, Kensuke Nakajima, Mechanism governing the size change of tropical cyclone-like vortices, J. Meteor. Soc. Japan, doi:10.2151/jmsj.2016-012, 94, 3, 2016.06. |
| 11. | Seiya Nishizawa, Masatsugu Odaka, Yoshiyuki O. Takahashi, Ko-ichiro Sugiyama, Kensuke Nakajima, Masaki Ishiwatari, Shin-ichi Takehiro, Hisashi Yashiro, Yousuke Sato, Hirofumi Tomita, Yoshi-Yuki Hayashi, Martian dust devil statistics from high-resolution large-eddy simulations, Geophysical Research Letters, 10.1002/2016GL068896, 2016.05, [URL]. |
| 12. | Tatsuya Yamashita, Masatsugu Odaka, Ko-ichiro Sugiyama, Kensuke Nakajima, Masaki Ishiwatari, Seiya Nishizawa, Yoshiyuki O. Takahashi, and Yoshi-Yuki Hayashi , A numerical study on convection of a condensing CO2 atmosphere under early Mars like conditions, Journal of the Atmospheric Sciences, 10.1175/JAS-D-15-0132.1, 2016.05, [URL]. |
| 13. | Masato Nakamura, Kensuke Nakajima, ほか50名, AKATSUKI returns to Venus, Earth Planets and Space, 10.1186/s40623-016-0457-6, 2016.05, [URL]. |
| 14. | Tsumura, K., Nakajima, K., and 13 others, Near-infrared Brightness of the Galilean Satellites Eclipsed in Jovian Shadow: A New Technique to Investigate Jovian Upper Atmosphere, Astrophysical Journal, 10.1088/0004-637X/789/2/122, 789, 2, article id. 122, 2014.07. |
| 15. | Ko-ichiro Sugiyama, Kensuke Nakajima, Masatsugu Odaka, Kiyoshi Kuramoto, Yoshi-Yuki Hayashi, Numerical Simulations of Jupiter's Moist Convection Layer: Structure and Dynamics in Statistically Steady States, ICARUS, dx.doi.org/10.1016/j.icarus.2013.10.016, 229, 71-91, 2014.02, [URL]. |
| 16. | Linear stability of thermal convection of anelastic fluid in a rotating spherical shell. |
| 17. | M.Blackburn, Kensuke Nakajima, ほか26名, The Aqua Planet Experiment (APE): Control SST Simulation, J. Meteor. Soc. Japan, doi:10.2151/jmsj.2013-A02, 91A, 17-56, 2013.09, [URL]. |
| 18. | D.L. WIlliamson, Kensuke Nakajima, ほか26名, The Aqua Planet Experiment (APE): Response to changed SST fields, J. Meteor. Soc. Japan, doi:10.2151/jmsj.2013-A03, 91A, 57-89, 2013.09, [URL]. |
| 19. | Kensuke Nakajima, Yukiko Yamada, Yoshiyuki O. Takahashi, Masaki Ishiwatari, Wataru Ohfuchi, Yoshi-Yuki Hayashi, The variety of spontaneously generated tropical precipitation patterns found in APE results , J. Meteor. Soc. Japan, doi:10.2151/jmsj.2013-A04., 91A, 91-141, 2013.09, [URL]. |
| 20. | Nakajima Kensuke, Yukiko Yamada, Yoshiyuki O Takahashi, Masaki Ishiwatari, Wataru Ohfuchi, Yoshi-Yuki Hayashi, The Variety of Forced Atmospheric Structure in Response to Tropical SST Anomaly Found in APE Results, J. Meteor. Soc. Japan, doi:10.2151/jmsj.2013-A05., 91A, 143-193, 2013.09, [URL]. |
| 21. | D.L.Williams, Kensuke Nakajima, ほか26名, The APE ATLAS, NCAR Technical Note, doi:10.5065/D6FF3QBR , NCAR/TN-484+STR, 508pp, 2012.12, [URL]. |
| 22. | M. Ishiwatari, E. Toyoda, Y. Morikawa, S. Takehiro, Y. Sasaki, S. Nishizawa, M. Odaka, N. Otobe, Y. O. Takahashi, K. Nakajima, T. Horinouchi, M. Shiotani, Y.-Y. Hayashi, and Gtool development group, "Gtool5": a Fortran90 library of input/output interfaces for self-descriptive multi-dimensional numerical data, Geoscientific Model Development, doi:10.5194/gmd-5-449-2012, 5, 2, 449-455, 2012.04, [URL]. |
| 23. | K. Nakajima, Y. Yamada, M. Ishiwatari, Y.-Y. Hayashi, Dependence of equatorial precipitation activity on the vertical profile of radiative cooling in an aqua-planet experiment, NAGARE Mutimedia, 2012 , 2012.03, [URL]. |
| 24. | Sugiyama,K., Nakajima,K., Odaka,M., Ishiwatari,M.,Kuramoto,K., Morikawa,Y., Nishizawa,S., Takahashi,Y.O., Hayashi,Y.-Y., Intermittent cumulonimbus activity breaking the three-layer cloud structure of Jupiter, Geophysical Research Letters, doi:10.1029/2011GL047878, 2011.07, [URL]. |
| 25. | Yamashita,T., Odaka, M., Sugiyama,K., Nakajima,K., Ihiwatari,M., Hayashi,Y.-Y., A two dimensional numerical experiment of atmospheric convection with condensation of the major component, Proceedings of the 42th ISAS Lunar and Planetary Symposium, 2010.07. |
| 26. | Development of a Cloud Convection Model to Investigate the Jupiter's Atmosphere, [URL]. |
| 27. | Tanaka,K.-K, Yamamoto,T., Watanabe,S., Nakajima,K., Analytic model of upper tropospheric clouds in the tropical Hadley cell, Earth, Planets and Space, Vol.60, pp.219-228., 2008.02. |
| 28. | Moist Convection in Jupiter's Atmosphere. |
| 29. | M. Ishiwatari, K. Nakajima S.Takehiro and Y.-Y. Hayashi, Dependence of climate states of gray atmosphere on solar constant: From the runaway greenhouse to the snowball states., J. Geophys. Res., Vol. 112, No. D13, D13120, 2007.06. |
| 30. | Yamada, Y., Sampe, T., Takahashi, Y.O., Yoshioka, M.K., Ohfuchi,W., Ishiwatari, M., Nakajima, K., Hayashi, Y.-Y., A resolution dependence of equatorial precipitation activities represented in a general circulation model., Theoretical and Applied Mechanics in Japan, Vol.43, pp.289-297, 2005.01. |
| 31. | K.Nakajima, E.Toyoda, M.Ishiwatari, S.Takehiro, Y.-Y. Hayashi,, Initial Development of Tropical Precipitation Patterns in Response to a Local Warm SST Area: An Aqua-Planet Ensemble Study, Journal of the Meteorological Society of Japan,, 10.2151/jmsj.82.1483, 82, 6, 1483-1504, Vol.82, No.6, pp.1483-1504., 2004.12. |
| 32. | Ishiwatari,M., Takehiro,S.-I., Nakajima, K., Hayashi,Y.-Y., A numerical study on the appearance of the runaway greenhouse state of a three-dimensional gray atmosphere, Journal of Atmospheric Science, 10.1175/1520-0469(2002)0592.0.CO;2, 59, 22, 3223-3238, Vol.59, pp.3223-3238., 2002.06. |
| 33. | A numerical simulation of thermal convection in the Martian lower atmosphere with a two-dimensional anelastic model.. |
| 34. | S. Takehiro, M. Ishiwatari, K. Nakajima and Y.-Y. Hayashi,, Linear stability of thermal convection in rotating systems with fixed heat flux boundaries, Geophysical and Astrophysical Fluid Dynamics, 10.1080/0309192021000036996, 96, 6, 439-459, Vol.96, pp.439-459., 2001.06. |
| 35. | Nakajima,K., Takehiro,S.-I., Ishiwatari,M., Hayashi,Y.-Y., Numerical modeling of Jupiter's moist convection layer., Geophysical Research Letters, 10.1029/2000GL011740, 27, 19, 3129-3132, Vol.27, No.19, pp.3129-3132., 2000.10. |
| 36. | Response of the Tropical Atmosphere to a Localized Warm SST Area: Time-Development Observed in an Aqua-Planet Ensemble Experiment. |
| 37. | S. Takehiro, M. Ishiwatari, K. Nakajima and Y.-Y. Hayashi,, The effects of thermal boundary condition on convection in rapidly rotating spherical shells, Theoretical and Applied Mech., Vol.48, pp.415-421, 1999.10. |
| 38. | The dependency of the strucure of the three-dimensional gray atmosphere on the solar constant and the runaway greenhouse states.. |
| 39. | "Cloud convections" in geophysical and planetary fluids. |
| 40. | Convection in a rotating cylindrical annulus with fixed heat flux boundaries. |
| 41. | Odaka,M., Nakajima,K., Takehiro,S.-I., Ishiwatari,M., Hayashi,Y.-Y., A numerical study of the Martian atmospheric convection with a two dimensional anelastic model, Earth, Planet and Space, Vol.50, pp.431-437., 1998.06. |
| 42. | The structure of Jupiter's atmosphere and the role of cloud convection. |
| 43. | Hosaka,M., Ishiwatari,M., Takehiro,S.-I., Nakajima,K., Hayashi,Y.-Y., Tropical precipitation patterns in response to a local warm SST area placed at the equator of an aqua planet, Journal of the Meteorological Society of Japan,, 76, 2, 289-305, Vol.76, No.2. pp.289-305., 1998.04. |
| 44. | Hibiya,T., Niwa,Y., Nakajima,K. and Suginphara,N, Direct Numerical Simulation of the Rolloff Range of Internal Wave Shear Spectra in the Ocean., Journal of Geophysical Research, 10.1029/96JC01001, 101, C6, 14123-14129, Vol.101, No.C6, pp.14123-14129., 1996.06. |
| 45. | Furue,R., Nakajima,K. and Ishikawa,I., Modal decomposition of deep ocean circulation models: Comparison with reduced-gravity models., Journal of Geophysical Research, Vol.100, No.C6, pp.10567-10588., 1995.06. |
| 46. | Nakajima,K. and Matsuno,T., Numerical experiments concerning the origin of cloud clusters in the tropical atmospher, Journal of the Meteorological Society of Japan,, Vol.66, pp.309-329., 1988.04. |
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