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Isamu Hirota
Researcher at Kyoto University
Publications - 53
Citations - 3793
Isamu Hirota is an academic researcher from Kyoto University. The author has contributed to research in topics: Stratosphere & Atmospheric wave. The author has an hindex of 24, co-authored 53 publications receiving 3546 citations.
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Journal ArticleDOI
The quasi-biennial oscillation
Mark P. Baldwin,Lesley J. Gray,Timothy J. Dunkerton,Kevin Hamilton,Peter H. Haynes,William J. Randel,James R. Holton,M. J. Alexander,Isamu Hirota,Takeshi Horinouchi,Dylan B. A. Jones,J. S. Kinnersley,C. Marquardt,Kaoru Sato,M. Takahashi +14 more
TL;DR: The quasi-biennial oscillation (QBO) as discussed by the authors dominates the variability of the equatorial stratosphere (∼16-50 km) and is easily seen as downward propagating easterly and westerly wind regimes, with a variable period averaging approximately 28 months.
Journal ArticleDOI
Equatorial Waves in the Upper Stratosphere and Mesosphere in Relation to the Semiannual Oscillation of the Zonal Wind
TL;DR: In this paper, an analysis is made of equatorial wave disturbances in the upper stratosphere and mesosphere by the use of meteorological rocket and satellite observations, to clarify their structure and behavior in relation to the semiannual oscillation of the mean zonal wind.
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Gravity wave and equatorial wave morphology of the stratosphere derived from long‐term rocket soundings
TL;DR: In this paper, the seasonal, geographical, and vertical variability of the variance of horizontal velocities, u' 2 + υ' 2, and relative-temperature perturbations, T' 2 *, were studied.
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Climatology of gravity waves in the middle atmosphere
TL;DR: In this article, an attempt is made at the statistical analysis of small-scale disturbances in the stratosphere and mesosphere with the aid of meteorological rocket observations at many stations from 77°N to 8°S for several years.
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Observational evidence of the semiannual oscillation in the tropical middle atmosphere—A review
TL;DR: In this paper, the long-term behavior of the mean zonal wind exhibits two semiannual cycles which have their maximum amplitudes centered at the stratopause level and the mesopause levels, each one being associated with the semiiannual temperature variations predominating at levels about 10 km lower.