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Toshihiko Hirooka

Professor

  • 615 Citations
  • 14 h-Index
1983 …2019
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Research Output 1983 2019

  • 615 Citations
  • 14 h-Index
  • 37 Article
2019

Diagnostics of a WN2-Type Major Sudden Stratospheric Warming Event in February 2018 Using a New Three-Dimensional Wave Activity Flux

Harada, Y., Sato, K., Kinoshita, T., Yasui, R., Hirooka, T. & Naoe, H., Jun 27 2019, In : Journal of Geophysical Research: Atmospheres. 124, 12, p. 6120-6142 23 p.

Research output: Contribution to journal › Article

stratospheric warming
Upper atmosphere
stratosphere
Fluxes
Eastern Hemisphere

On the dynamics of the spring seasonal transition in the two hemispheric high-latitude stratosphere

Wang, T., Zhang, Q., Hannachi, A., Lin, Y. & Hirooka, T., Jan 1 2019, In : Tellus, Series A: Dynamic Meteorology and Oceanography. 71, 1, p. 1-18 18 p.

Research output: Contribution to journal › Article

Open Access
planetary wave
stratosphere
Southern Hemisphere
Northern Hemisphere
wave breaking
3 Citations (Scopus)

Primary factors behind the Heavy Rain Event of July 2018 and the subsequent heat wave in Japan

Shimpo, A., Takemura, K., Wakamatsu, S., Togawa, H., Mochizuki, Y., Takekawa, M., Tanaka, S., Yamashita, K., Maeda, S., Kurora, R., Murai, H., Kitabatake, N., Tsuguti, H., Mukougawa, H., Iwasaki, T., Kawamura, R., Kimoto, M., Takayabu, I., Takayabu, Y. N., Tanimoto, Y. & 5 others, Hirooka, T., Masumoto, Y., Watanabe, M., Tsuboki, K. & Nakamura, H., Jan 1 2019, In : Scientific Online Letters on the Atmosphere. 15, A, p. 13-18 6 p.

Research output: Contribution to journal › Article

Open Access
extreme event
airflow
global warming
Northern Hemisphere
anomaly

Troposphere-stratosphere dynamical coupling in regard to the north atlantic eddy-driven jet variability

Iqbal, W., Hannachi, A., Hirooka, T., Chafik, L. & Harada, Y., Jan 1 2019, In : Journal of the Meteorological Society of Japan. 97, 3, p. 657-671 15 p.

Research output: Contribution to journal › Article

Open Access
stratosphere
troposphere
eddy
jet stream
polar vortex
2018

Analysis of the Ozone Reduction Event Over the Southern Tip of South America in November 2009

Akiyoshi, H., Kadowaki, M., Nakamura, H., Sugita, T., Hirooka, T., Harada, Y. & Mizuno, A., Nov 27 2018, In : Journal of Geophysical Research: Atmospheres. 123, 22, p. 12,523-12,542

Research output: Contribution to journal › Article

Ozone
ozone
total ozone
geopotential height
geopotential
2017
3 Citations (Scopus)

Extraordinary Features of the Planetary Wave Propagation During the Boreal Winter 2013/2014 and the Zonal Wave Number Two Predominance

Harada, Y. & Hirooka, T., Nov 16 2017, In : Journal of Geophysical Research: Atmospheres. 122, 21, p. 11,374-11,387

Research output: Contribution to journal › Article

planetary wave
planetary waves
Wave propagation
winter
wave propagation
2 Citations (Scopus)

Stratospheric tropical warming event and its impact on the polar and tropical troposphere

Kodera, K., Eguchi, N., Mukougawa, H., Nasuno, T. & Hirooka, T., Jan 12 2017, In : Atmospheric Chemistry and Physics. 17, 1, p. 615-625 11 p.

Research output: Contribution to journal › Article

troposphere
warming
planetary wave
tropopause
polar region
2016
4 Citations (Scopus)

Predictability changes of stratospheric circulations in northern hemisphere winter

Ichimaru, T., Noguchi, S., Hirooka, T. & Mukougawa, H., Jan 1 2016, In : Journal of the Meteorological Society of Japan. 94, 1, p. 7-24 18 p.

Research output: Contribution to journal › Article

Northern Hemisphere
planetary wave
winter
anomaly
geopotential
2015
5 Citations (Scopus)

Month-to-month predictability variations of the winter-time stratospheric polar vortex in an operational one-month ensemble prediction system

Noguchi, S., Mukougawa, H., Hirooka, T., Taguchi, M. & Yoden, S., Jan 1 2015, In : Journal of the Meteorological Society of Japan. 92, 6, p. 543-558 16 p.

Research output: Contribution to journal › Article

polar vortex
winter
prediction
stratosphere
temperature
2014
10 Citations (Scopus)

Circulation changes in the stratosphere and mesosphere during the stratospheric sudden warming event in January 2009

Iida, C., Hirooka, T. & Eguchi, N., Jun 27 2014, In : Journal of Geophysical Research. 119, 12, p. 7104-7115 12 p.

Research output: Contribution to journal › Article

Upper atmosphere
mesosphere
stratosphere
heating
westerly
2012
33 Citations (Scopus)

Ionospheric current system during sudden stratospheric warming events

Yamazaki, Y., Yumoto, K., McNamara, D., Hirooka, T., Uozumi, T., Kitamura, K., Abe, S. & Ikeda, A., Jan 1 2012, In : Journal of Geophysical Research: Space Physics. 117, 3, A03334.

Research output: Contribution to journal › Article

stratospheric warming
ionospheric currents
electrojets
Upper atmosphere
electrojet
2010
80 Citations (Scopus)

A major stratospheric sudden warming event in January 2009

Harada, Y., Goto, A., Hasegawa, H., Fujikawa, N., Naoe, H. & Hirooka, T., Jun 1 2010, In : Journal of the Atmospheric Sciences. 67, 6, p. 2052-2069 18 p.

Research output: Contribution to journal › Article

troposphere
planetary wave
data assimilation
stratosphere
trough
2009
22 Citations (Scopus)

Influence of stratospheric circulation on the predictability of the tropospheric Northern Annular Mode

Mukougawa, H., Hirooka, T. & Kuroda, Y., Apr 28 2009, In : Geophysical Research Letters. 36, 8, L08814.

Research output: Contribution to journal › Article

Arctic Oscillation
Northern Hemisphere
forecasting
anomalies
anomaly
2008
45 Citations (Scopus)

Characteristics of atmospheric gravity wave activity in the polar regions revealed by GPS radio occultation data with CHAMP

Hei, H., Tsuda, T. & Hirooka, T., Feb 27 2008, In : Journal of Geophysical Research Atmospheres. 113, 4, D04107.

Research output: Contribution to journal › Article

radio occultation
Polar Regions
CHAMP
atmospheric wave
Gravity waves
2007
21 Citations (Scopus)

Predictability of stratospheric sudden warmings as inferred from ensemble forecast data: Intercomparison of 2001/02 and 2003/04 winters

Hirooka, T., Ichimaru, T. & Mukougawa, H., Dec 1 2007, In : Journal of the Meteorological Society of Japan. 85, 6, p. 919-925 7 p.

Research output: Contribution to journal › Article

warming
winter
planetary wave
forecast
sudden stratospheric warming
4 Citations (Scopus)

Predictability of the downward migration of the Northern Annular Mode: A case study for January 2003

Mukougawa, H. & Hirooka, T., Dec 1 2007, In : Journal of the Meteorological Society of Japan. 85, 6, p. 861-870 10 p.

Research output: Contribution to journal › Article

Arctic Oscillation
anomaly
planetary wave
tropopause
zonal wind
2006
15 Citations (Scopus)

Dynamical quantifications of ozone minihole formation in both hemispheres

Iwao, K. & Hirooka, T., Jan 27 2006, In : Journal of Geophysical Research Atmospheres. 111, 2, D02104.

Research output: Contribution to journal › Article

Ozone
hemispheres
ozone
total ozone
stratosphere
2005
42 Citations (Scopus)

High sensitivity to the initial condition for the prediction of stratospheric sudden warming

Mukougawa, H., Sakai, H. & Hirooka, T., Sep 16 2005, In : Geophysical Research Letters. 32, 17, p. 1-4 4 p., L17806.

Research output: Contribution to journal › Article

heating
sensitivity
prediction
predictions
zonal wind
2004
46 Citations (Scopus)

Predictability of stratospheric sudden warming: A case study for 1998/99 winter

Mukougawa, H. & Hirooka, T., Jul 1 2004, In : Monthly Weather Review. 132, 7, p. 1764-1776 13 p.

Research output: Contribution to journal › Article

planetary wave
winter
warming
prediction
weather
2003
8 Citations (Scopus)

Quasi-biennial variation of the 5-day wave in the stratosphere

Miyoshi, Y. & Hirooka, T., Oct 16 2003, In : Journal of Geophysical Research D: Atmospheres. 108, 19, p. ACL 15-1 - 15-3

Research output: Contribution to journal › Article

Upper atmosphere
stratosphere
wind variations
quasi-biennial oscillation
zonal wind
2002
3 Citations (Scopus)

Interannual variations of the general circulation and polar stratospheric ozone losses in a general circulation model

Watanabe, S., Hirooka, T. & Miyahara, S., Jan 1 2002, In : Journal of the Meteorological Society of Japan. 80, 4 B, p. 877-895 19 p.

Research output: Contribution to journal › Article

annual variation
general circulation model
ozone
ozone depletion
stratosphere
2000
24 Citations (Scopus)

Normal mode rossby waves as revealed by UARS/ISAMS observations

Hirooka, T., May 1 2000, In : Journal of the Atmospheric Sciences. 57, 9, p. 1277-1285 9 p.

Research output: Contribution to journal › Article

UARS
Rossby wave
mesosphere
mesopause
zonal wind
1999
31 Citations (Scopus)

A numerical experiment of excitation of the 5-day wave by a GCM

Miyoshi, Y. & Hirooka, T., Jun 1 1999, In : Journal of the Atmospheric Sciences. 56, 11, p. 1698-1707 10 p.

Research output: Contribution to journal › Article

general circulation model
Rossby wave
experiment
convection
topography
1 Citation (Scopus)

Radiative and dynamical impacts of Arctic and Antarctic ozone holes: General circulation model experiments

Hirooka, T., Yoshikawa, M., Miyahara, S. & Kayahara, T., Jan 1 1999, In : Advances in Space Research. 24, 12, p. 1637-1640 4 p.

Research output: Contribution to journal › Article

ozone depletion
Ozone
stratosphere
general circulation model
Upper atmosphere
1995
14 Citations (Scopus)

Long range transport of sulfur compounds over the western North Pacific: Deposition samples obtained on Islands

Dokiya, Y., Miyakoshi, N., Hirooka, T., Yamashita, J., Ishikawa, S., Ohya, M. & Sugaya, J., Jan 1 1995, In : Journal of the Meteorological Society of Japan. 73, 5, p. 873-881 9 p.

Research output: Contribution to journal › Article

sulfur compound
long range transport
calcium
sulfate
ammonium
27 Citations (Scopus)

Periods of planetary waves in geomagnetic variations

Kohsiek, A., Glassmeier, K. H. & Hirooka, T., Feb 28 1995, In : Annales Geophysicae. 13, 2, p. 168-176 9 p.

Research output: Contribution to journal › Article

planetary wave
planetary waves
time series
oscillation
stations
1994

Long-term variations of stratospheric circulations: a comparison of mean fields in the 1980s with CIRA-1986 models

Hirooka, T., Yamashita, J. & Kawahira, K., Jan 1 1994, In : Journal of Atmospheric and Terrestrial Physics. 56, 9, p. 1041-1049 9 p.

Research output: Contribution to journal › Article

Upper atmosphere
winter
stratosphere
hemispheres
night
1992
5 Citations (Scopus)

Stratospheric Circulation of the Northern Hemisphere Winter during 1989-90

Hirooka, T., Hayashi, K. & Yamada, S., Jan 1 1992, In : Journal of geomagnetism and geoelectricity. 44, 11, p. 1097-1106 10 p.

Research output: Contribution to journal › Article

Northern Hemisphere
winter
warming
heating
quasi-biennial oscillation
3 Citations (Scopus)

Variations of mean zonal winds relating to the ozone hole

Kawahira, K. & Hirooka, T., Jan 1 1992, In : Journal of Geophysical Research. 97, D9

Research output: Contribution to journal › Article

ozone depletion
Ozone
zonal wind
ozone
Upper atmosphere
1989
16 Citations (Scopus)

Further evidence of normal mode Rossby waves

Hirooka, T. & Hirota, I., Jan 1 1989, In : Pure & Applied Geophysics. 138, 2-3, p. 277-289 13 p.

Research output: Contribution to journal › Article

Upper atmosphere
Rossby wave
planetary waves
stratosphere
atmosphere
5 Citations (Scopus)

Further evidence of normal mode Rossby waves

Hirooka, T. & Hirota, I., Jun 1 1989, In : Pure and Applied Geophysics PAGEOPH. 130, 2-3, p. 277-289 13 p.

Research output: Contribution to journal › Article

Upper atmosphere
Rossby wave
planetary waves
stratosphere
Troposphere

Interannual temperature changes in the Antarctic lower stratosphere‐A relation to the ozone hole

Kawahira, K. & Hirooka, T., Jan 1 1989, In : Geophysical Research Letters. 16, 1, p. 41-44 4 p.

Research output: Contribution to journal › Article

ozone depletion
ozone
winter
temperature
stratosphere
1988
3 Citations (Scopus)

An intercomparison of medium-scale waves in the Northern and Southern Hemispheres

Hirooka, T., Kuki, T. & Hirota, I., Jan 1 1988, In : Journal of the Meteorological Society of Japan. 66, 6, p. 857-868 12 p.

Research output: Contribution to journal › Article

Southern Hemisphere
Northern Hemisphere
stratosphere
troposphere
disturbance
1986
11 Citations (Scopus)

Influence of normal mode Rossby waves on the mean field: interference with quasi-stationary waves.

Hirooka, T., Jan 1 1986, In : Journal of the Atmospheric Sciences. 43, 19, p. 2088-2097 10 p.

Research output: Contribution to journal › Article

standing wave
Rossby wave
divergence
NOAA satellite
stratosphere
1984
2 Citations (Scopus)

Normal mode Rossby waves observed in the upper stratosphere.

Hirota, I. & Hirooka, T., Jan 1 1984, In : Unknown Journal. p. 199-213 15 p.

Research output: Contribution to journal › Article

Rossby wave
stratosphere
filter
74 Citations (Scopus)

Normal mode Rossby waves observed in the upper stratosphere. Part I: first symmetric modes of zonal wavenumbers 1 and 2.

Hirota, I. & Hirooka, T., Jan 1 1984, In : Journal of the Atmospheric Sciences. 41, 8, p. 1253-1267 15 p.

Research output: Contribution to journal › Article

Rossby wave
stratosphere
planetary wave
analysis
1983
53 Citations (Scopus)

Upper stratospheric circulations in the two hemispheres observed by satellites

Hirota, I., Hirooka, T. & Shiotani, M., Jan 1 1983, In : Quarterly Journal of the Royal Meteorological Society. 109, 461, p. 443-454 12 p.

Research output: Contribution to journal › Article

Southern Hemisphere
Northern Hemisphere
stratosphere
planetary wave
winter