Papers - YOSHIDA Ryuji
about 35-
Two-Dimensional Idealized Hadley Circulation Simulation for Global High Resolution Model Development
Ryuji Yoshida, Takanobu Yamaguchi, Graham Feingold
Journal of Advaces in Modeling Earth Systems 14 ( 1 ) 2022 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Yoshida Ryuji, Fudeyasu Hironori
MONTHLY WEATHER REVIEW 148 ( 2 ) 559 - 576 2020.2 [Reviewed]
DOI Web of Science CiNii Research
Authorship：Lead author, Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：American Meteorological Society Joint Work
The low-level flow pattern characteristics of the tropical cyclone genesis (TCG) environment over the western North Pacific (WNP) were investigated not only for the periods during which TCG occurred, but also for the periods during which no TCG occurred. The flow patterns investigated were the shear line (SL), confluence region (CR), and easterly wave (EW) patterns. Although these flow patterns are recognized as favorable environmental conditions for TCG, their general characteristics, such as the climatological horizontal distribution, have not been previously investigated and there has been no comparison of the significance of the TCG cases to the climatological mean. We examined flow patterns using flow pattern indices defined by the modified semiobjective analysis method. SL and CR were broadly distributed over the WNP east of the Philippines during the boreal summer season. There was a peak in the EW from summer to autumn and it was distributed in a band running in an east–west direction at a lower latitude. Flow pattern indices of all three flow patterns gradually intensified until the TCG date was reached. The SL and EW indices became more intense compared to the climatological mean one day before the TCG, while that of the CR did not exceed the climatological mean. TCG occurred at the eastern edge of the area with a high genesis potential index and relative humidity and a weak vertical shear over flow patterns. This determination of the general characteristics of favorable flow pattern conditions improves our understanding of the TCG process.
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Kawabata, Y; Yamaguchi, M; Fudeyasu, H; Yoshida, R
TROPICAL CYCLONE RESEARCH AND REVIEW 13 ( 4 ) 344 - 355 2024.12 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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DCMIP2016: the tropical cyclone test case
Willson, J. L. and Reed, K. A. and Jablonowski, C. and Kent, J. and Lauritzen, P. H. and Nair, R. a … Show more authors
Willson, J. L. and Reed, K. A. and Jablonowski, C. and Kent, J. and Lauritzen, P. H. and Nair, R. and Taylor, M. A. and Ullrich, P. A. and Zarzycki, C. M. and Hall, D. M. and Dazlich, D. and Heikes, R. and Konor, C. and Randall, D. and Dubos, T. and Meurdesoif, Y. and Chen, X. and Harris, L. and K\"uhnlein, C. and Lee, V. and Qaddouri, A. and Girard, C. and Giorgetta, M. and Reinert, D. and Miura, H. and Ohno, T. and Yoshida, R. Hide authors
Geoscientific Model Development 17 ( 7 ) 2493 - 2507 2024.2 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
Other Link： https://gmd.copernicus.org/articles/17/2493/2024/
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Xiang Chunyi, Fudeyasu Hironori, Shimada Udai, Yoshida Ryuji
Scientific Online Letters on the Atmosphere 20 ( 0 ) 55 - 61 2024.1 [Reviewed]
DOI Web of Science CiNii Research
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：公益社団法人 日本気象学会 Joint Work
<p>Shallow coastal seawater response during the passage of near-landfall intensification (NLI) tropical cyclones (TCs) and non-NLI TCs was examined using oceanic and atmospheric reanalysis data and observations. The sea surface temperature ahead of the NLI-TC track is maintained or even increases when NLI-TC is approaching the land. The magnitude of the wind stress, which plays an important role in the NLI process, is related to the zonal surface wind on the right side of the tracks. Coastal mixed layer warming can be explained by Ekman transport under sustained wind stress due to surface wind forcing. The successive deepening of the coastal ocean boundary layer and the increase in warming in the subsurface seawater temperature by an average of 0.3°C, could maintain thermal capacity in a certain degree. This shallow coastal water response could partly explain the NLI progress in the northern South China Sea, indicating the importance of coastal ocean dynamics and air-sea interactions.</p>
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Contributions of the Large-Scale Environment to the Typhoon Genesis of Faxai (2019)
FUDEYASU Hironori, SHIMADA Udai, OIKAWA Yoshinori, EITO Hisaki, WADA Akiyoshi, YOSHIDA Ryuji, HORIN … Show more authors
FUDEYASU Hironori, SHIMADA Udai, OIKAWA Yoshinori, EITO Hisaki, WADA Akiyoshi, YOSHIDA Ryuji, HORINOUCHI Takeshi Hide authors
Journal of the Meteorological Society of Japan. Ser. II advpub ( 0 ) 617 - 630 2022 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：Meteorological Society of Japan Joint Work
<p>This study investigated the atmospheric and oceanic contributions to the genesis of Typhoon Faxai in 2019. Our statistical analysis using the tropical cyclone genesis score (TGS) attributed the tropical disturbance that developed into Faxai (Pre-Faxai) to easterly waves (EWs). The EW score evaluated by a grid version of the TGS (Grid-EW) averaged around the occurrence of Pre-Faxai was approximately twice as large as the climatological mean, and it was the second largest value in the past 38 years. The Pre-Faxai area with high Grid-EW scores could be traced back to the eastern North Pacific (ENP) around August 25, 2019. The lower-troposphere environment characterized by high Grid-EW scores was favorable for vortex formation because it provided a containment area for moisture entrained by the developing circulation or lofted by the deep convection therein. The Pre-Faxai area with high Grid-EW scores moved westward due to the background easterly flow over the ENP and then entered the western North Pacific (WNP). The Typhoon Intensity Forecast Scheme (TIFS) showed that the important environments for its genesis were ocean conditions and the vertical wind shear. The oceanic conditions contributed to the development of Pre-Faxai as it traveled over the WNP. The enhancement of vertical wind shear and subsequent suppression of the development of Pre-Faxai were caused by the lower-troposphere easterly winds associated with high EW scores. They were also caused by upper-troposphere westerly winds associated with an upper cold low northwest of Pre-Faxai. When the vertical shear decreased with weakening of the upper cold low, Pre-Faxai reached tropical storm intensity on September 4. Therefore, TGS and TIFS detected Pre-Faxai 10 days before the typhoon arose, which indicates that monitoring environmental factors such as EW and vertical wind shear are important for disaster prevention.</p>
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Fudeyasu, H; Yoshida, K; Yoshida, R
OCEANS-SWITZERLAND 1 ( 4 ) 355 - 368 2020.12 [Reviewed]
Language：Japanese Publishing type：Research paper (scientific journal) Joint Work
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Fudeyasu Hironori, Yoshida Ryuji, Yamaguchi Munehiko, Eito Hisaki, Muroi Chiashi, Nishimura Shuji, … Show more authors
Fudeyasu Hironori, Yoshida Ryuji, Yamaguchi Munehiko, Eito Hisaki, Muroi Chiashi, Nishimura Shuji, Bessho Kotaro, Oikawa Yoshinori, Koide Naohisa Hide authors
Journal of the Meteorological Society of Japan. Ser. II 98 ( 1 ) 61 - 72 2020 [Reviewed]
DOI Web of Science CiNii Research
Language：English Publishing type：Research paper (scientific journal) Publisher：Meteorological Society of Japan Joint Work
<p>This study investigated the characteristics and environmental conditions of tropical cyclones (TCs) over the western North Pacific from 2009 to 2017 that dissipated before reaching tropical storm strength (TDs) under unfavorable environmental conditions; we compared TDs with TCs that reached tropical storm strength (TSs) in terms of modulations of relevant large-scale flow patterns. The flow patterns were categorized based on five factors: shear line, confluence region, monsoon gyre, easterly waves, and Rossby wave energy dispersion from a preexisting cyclone. Among 476 cases, 263 TDs were detected using best-track data and early stage Dvorak analysis. The TCs in the environments associated with the confluence region or Rossby wave energy dispersion (easterly waves) tended to reach tropical storm strength (remain weak) compared with the other factors. The average locations of TDs at the time of cyclogenesis in the confluence region, monsoon gyre, and easterly waves (Rossby wave energy dispersion) in the summer and autumn were farther to the west (east and north) than those of TSs that exhibited the same factors. The environments around TDs were less favorable for development than those around TSs, as there were significant differences in atmospheric (oceanic) environmental parameters between TDs and TSs in the factors of confluence region, easterly waves, and Rossby wave energy dispersion (shear line, monsoon gyre, and Rossby wave energy dispersion). The environmental conditions for reaching tropical storm strength over their developing stage, using five factors, can be summarized as follows: higher tropical cyclone heat potential in the shear line and monsoon gyre, weak vertical shear in the confluence region, wet conditions in the easterly waves, and higher sea surface temperatures and an intense preexisting cyclone in Rossby wave energy dispersion from a preexisting cyclone.</p>
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Changes in extended boreal summer tropical cyclogenesis associated with large-scale flow patterns over the western North Pacific in response to the global warming hiatus.
2020 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Development Conditions for Tropical Storms over the Western North Pacific Stratified by Large-Scale Flow Patterns.
Journal of the Meteorological Society of Japan. Ser. II 98 ( 1 ) 61 - 72 2020 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Convergence of Convective Updraft Ensembles with Respect to the Grid Spacing of Atmospheric Models.
46 ( 24 ) 14817 - 14825 2019 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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DCMIP2016: The splitting supercell test case.
12 879 - 892 2019 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Statistical Analysis of the Relationship between Upper Tropospheric Cold Lows and Tropical Cyclone Genesis over the Western North Pacific.
Journal of the Meteorological Society of Japan. Ser. II 97 ( 2 ) 439 - 451 2019 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Maintenance condition of back-building squall-line in a numerical simulation of a heavy rainfall event in July 2010 in Western Japan.
20 ( 1 ) e880 2018 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Decomposition of the large-scale atmospheric state driving downscaling: a perspective on dynamical downscaling for regional climate study
2018-5:2 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Western North Pacific Tropica Cyclone Characteristics Stratified by Genesis Environment
146 435 - 446 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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An evaluation method for uncertaintiesin regional climate projections.
20 ( 1 ) e877 2018 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Contributions of changes in climatology and perturbation and the resulting nonlinearity to regional climate change.
8 2224 2017 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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The effect of water vapor on tropical cyclone genesis: A numerical experiment of a non-developing disturbance observed in PALAU2010
Journal of the Meteorological Society of Japan. Ser. II 95 35 - 47 2017 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Joint Work
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The near-real-time SCALE-LETKF system: A case of the September 2015 Kanto-Tohoku heavy rainfall.
13 1 - 6 2017 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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CONeP: A cost-effective online nesting procedure for regional atmospheric models
65 21 - 31 2017 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Joint Work
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DCMIP2016: A Review of Non-hydrostatic Dynamical Core Design and Intercomparison of Participating Models
10 4477 - 4509 2017 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Assimilating All-Sky Himawari-8 Satellite Infrared Radiances: A Case of Typhoon Soudelor (2015)
146 213 - 249 2017 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Resolution dependence of the diurnal cycle of precipitation simulated by a global cloud-system resolving model
12 272 - 276 2016 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Performance Analysis and Optimization of Nonhydrostatic ICosahedral Atmospheric Model (NICAM) on the K computer and TSUBAME2.5
2016 [Reviewed]
Language：English Publishing type：Research paper (international conference proceedings) Joint Work
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Modulation of the Quasi-Biweekly Oscillation on Tropical Cyclogenesis in the Western North Pacific
2016 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Precursors of deep moist convection in a subkilometer global simulation
2016 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Global cloud-permitting simulations of Typhoon Fengshen (2008)
3:32 2016 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Resolution dependence of deep convections in a global simulation from over 10-kilometer to sub-kilometer grid spacing
3:16 2016 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Impact of the Madden-Julian Oscillation on Western North Pacific Tropical Cyclogenesis Associated with Large-Scale Patterns.
54 ( 1413 ) 1429 2015 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Horizontal Distance of Each Cumulus and Cloud Broadening Distance Determine Cloud Cover
11 ( 75 ) 79 2015 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Does convection vary in different cloudy disturbances?
2014 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Impact of Boreal Summer Intraseasonal Oscillation on Environment of Tropical Cyclone Genesis over the Western North Pacific
10 ( 15 ) 18 2014 [Reviewed]
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Joint Work
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Environmental Factors Contributing to Tropical Cyclone Genesis over the Western North Pacific.
Yoshida Ryuji, Hirohiko Ishikawa
MONTHLY WEATHER REVIEW 141 451 - 467 2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work
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Deep moist atmospheric convection in a sub-kilometer global simulation
2013 [Reviewed]
Language：English Publishing type：Research paper (scientific journal) Joint Work