Publications

Publication list on tropical cyclone research

Image of Tsukada et al. (2024)

Wind distribution in the eye of tropical cyclone revealed by a novel atmospheric motion vector derivation


A novel method to derive atmospheric motion vectors specifically for tropical cyclones is developed. In all three analyzed storms, algebraically growing wavenumber-1 disturbances are observed, and in one case, the eye rotation is found to accelerate by 1.5 times within 1 hour. The mechanism behind this acceleration is examined.

Citation: Tsukada, T., T. Horinouchi, and S. Tsujino, 2024: Wind distribution in the eye of tropical cyclone revealed by a novel atmospheric motion vector derivation. Journal of Geophysical Research: Atmospheres, 129, e2023JD040585. https://doi.org/10.1029/2023JD040585.

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Evaluations of actual and adjusted wind–pressure relationship of tropical cyclone using aircraft-assisted best track data


The relationship between maximum sustained wind speed (Vmax) and minimum sea level pressure (Pmin) of tropical cyclones (TC), which is called the wind–pressure relationship (WPR), is investigated by using best track data in which aircraft observations are used. On average, for given Vmax (Pmin), Pmin (Vmax) varies by 8.5 hPa (11.0 kt) between the 25th and 75th percentiles, and it varies by 17.1 hPa (22.6 kt) between the 10th and 90th percentiles; corresponding variations in the Dvorak Current Intensity (CI) numbers are also quantified. Also investigated is an adjusted WPR in which environmental conditions are incorporated through multiple linear regression. Its utilization reduces the variations to 6.9 hPa (9.5 kt) between the 25th and 75th percentiles and 13.0 hPa (18.9 kt) between the 10th and 90th percentiles. These remaining variations indicate intrinsic variability of WPR, suggesting a need for further utilization of observations to improve the intensity estimation of TCs.

Citation: Arakane, S., and T. Horinouchi, 2024: Evaluations of actual and adjusted wind–pressure relationship of tropical cyclone using aircraft-assisted best track data. SOLA, 20, 23−30. https://doi.org/10.2151/sola.2024-004.

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A New Closure Assumption and Formulation Based on the Helmholtz Decomposition for Improving Retrievals for Vortex Circulations from Single-Doppler Radar Observations


The present study proposes a new closure allowing asymmetric radial winds and improving retrievals for tropical cyclone winds from single-Doppler radar observations in the previous technique. The relative error of the axisymmetric tangential wind in an idealized vortex with asymmetric structure from the new approach is less than 2% at the radius of the maximum wind speed. In applying to a real TC with an elliptical eyewall, we found that the new approach can largely suppress an artificial evolution of the tangential winds in the previous retrieval technique.

Citation: Tsujino, S., T. Horinouchi, and U. Shimada, 2024: A New Closure Assumption and Formulation Based on the Helmholtz Decomposition for Improving Retrievals for Vortex Circulations from Single-Doppler Radar Observations. Monthly Weather Review, 152, 145–168. https://doi.org/10.1175/MWR-D-23-0043.1.

Image of Horinouchi & Mitsuyuki (2023)

GrossGross Assessment of the Dynamical Impact of Numerous Power-Generating Sailing Ships on the Atmosphere and Evaluation of the Impact on Tropical Cyclones


Power generation by sailing ships has a potential to become a major renewable energy source of the world. This paper proposes a basic method to assess their impact on the atmosphere. Also presented is the impact of their operation under tropical cyclones based on the MPI theory.

Citation: Horinouchi, T., and T. Mitsuyuki, 2023: GrossGross Assessment of the Dynamical Impact of Numerous Power-Generating Sailing Ships on the Atmosphere and Evaluation of the Impact on Tropical Cyclones. SOLA, 19, 57-62. https://doi.org/10.2151/sola.2023-008.

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Strong Relationship between Eye Radius and Radius of Maximum Wind of Tropical Cyclones


A very high correlation (cc=0.97) was found between the "eye radius" measured from geostationary meteorological satellites and the "radius of maximum wind (RMW)" measured from sea surface winds retrieved by C-band SAR satellites in tropical cyclones. By using this relationship, RMW, which is rare to observe, can be estimated extensively, frequently, and accurately by regression from eye radius measured by geostationary satellites.

Citation: Tsukada, T., and T. Horinouchi, 2023: Strong Relationship between Eye Radius and Radius of Maximum Wind of Tropical Cyclones. Monthly Weather Review, 151(2), 569-588. https://doi.org/10.1175/MWR-D-22-0106.1.

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Stationary and Transient Asymmetric Features in Tropical Cyclone Eye with Wavenumber-one Instability: Case Study for Typhoon Haishen (2020) with Atmospheric Motion Vectors from 30-second Imaging


By using a special observation with the Himawari-8 satellite conducted every 30 seconds, we derived wind distributions at an unprecedented spatiotemporal resolution. It was found that a kind of wavenumber-1 instability redistributed angular momentum to accelerate winds near the center. This instability might be important in many tropical cyclones.

Citation: Horinouchi, T., S. Tsujino, M. Hayashi, U. Shimada, W. Yanase, A. Wada, and H. Yamada, 2023: Stationary and Transient Asymmetric Features in Tropical Cyclone Eye with Wavenumber-one Instability: Case Study for Typhoon Haishen (2020) with Atmospheric Motion Vectors from 30-second Imaging. Monthly Weather Review, 151(1), 253-273. https://doi.org/10.1175/MWR-D-22-0179.1.

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Multiple Dynamics of Precipitation Concentrated on the North Side of Typhoon Hagibis (2019) during Extratropical Transition


Citation: Yanase, W., K. Araki, A. Wada, U. Shimada, M. Hayashi, and T. Horinouchi, 2022: Multiple Dynamics of Precipitation Concentrated on the North Side of Typhoon Hagibis (2019) during Extratropical Transition. Journal of the Meteorological Society of Japan Ser. II, 100, 5, 783-805. https://doi.org/10.2151/jmsj.2022-041.

Image of Tsujino et al. (2021)

Stationary and Transient Asymmetric Features in Tropical Cyclone Eye with Wavenumber-one Instability: Case Study for Typhoon Haishen (2020) with Atmospheric Motion Vectors from 30-second Imaging


Citation: Tsujino, S., T. Horinouchi, T. Tsukada, H.-C. Kuo, H. Yamada, and K. Tsuboki, 2021: Stationary and Transient Asymmetric Features in Tropical Cyclone Eye with Wavenumber-one Instability: Case Study for Typhoon Haishen (2020) with Atmospheric Motion Vectors from 30-second Imaging. Journal of Geophysical Research: Atmospheres, 126, e2020JD034434. https://doi.org/10.1029/2020JD034434.

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Estimation of the Tangential Winds and Asymmetric Structures in Typhoon Inner Core Region Using Himawari-8


Citation: Tsukada, T., and T. Horinouchi, 2020: Estimation of the Tangential Winds and Asymmetric Structures in Typhoon Inner Core Region Using Himawari-8. Geophysical Research Letters, 47, e2020GL087637. https://doi.org/10.1029/2020GL087637.

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Potential vorticity mixing and rapid intensification in the numerically simulated Supertyphoon Haiyan (2013)


Citation: Tsujino, S., and H.-C. Kuo, 2020: Potential vorticity mixing and rapid intensification in the numerically simulated Supertyphoon Haiyan (2013). Journal of the Atmospheric Sciences, 77, 2067-2090. https://doi.org/10.1175/JAS-D-19-0219.1.

Image of Horinouchi et al. (2020)

Convective bursts with gravity waves in tropical cyclones: Case study with the Himawari‐8 satellite and idealized numerical study


Citation: Horinouchi, T., U. Shimada, and A. Wada, 2020: Convective bursts with gravity waves in tropical cyclones: Case study with the Himawari‐8 satellite and idealized numerical study. Geophysical Research Letters, 47, e2019GL086295. https://doi.org/10.1029/2019GL086295.