Updated on 2025/03/27

写真a

 
Morimoto Akihiko
 
Organization
Premier Institute for Advanced Studies (PIAS) Center for Marine Environmental Studies (CMES) Professor
Title
Professor
Contact information
メールアドレス
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Degree

  • Ph. D ( Kyushu University )

Research Areas

  • Natural Science / Atmospheric and hydrospheric sciences

Education

  • Ehime University   Faculty of Engineering

    1990.4 - 1994.3

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Research History

  • Ehime University   Center for Marine Environmental Studies   Professor

    2015.4

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  • Nagoya University   Hydrospheric Atmospheric Research Center

    2007.4 - 2015.3

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  • Nagoya University   Hydrospheric Atmospheric Research Center

    2003.10 - 2007.3

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  • National Fisheries University

    2001.3 - 2003.9

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  • Ehime University   Faculty of Engineering

    1997.4 - 2001.2

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Professional Memberships

  • The Oceanographic Society of Japan

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Papers

  • Sea surface height measurements by Nadir UAV altimeters using Nadir LiDAR and low-cost GNSS Reflectometry Reviewed

    Ichikawa, K., Noda, J., Sakemi, R., Yufu, K., Morimoto, A., Onishi, H., Pakavanich, T.

    Remote sensing   16   4577   2024.12

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    Publishing type:Research paper (scientific journal)  

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  • Semidiurnal Internal Tides in a Shelf Sea South of Japan: Characteristics, Energetics, and Temporal variations Reviewed

    Shuya Wang, Xinyu Guo, Akihiko Morimoto, Anzhou Cao, Eisuke Tsutsumi, Yasumasa Miyazawa, Sergey M. Varlamov

    Progress in Oceanography   222   2024.3

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    Publishing type:Research paper (scientific journal)  

    Tidal mixing in a shelf sea south of Japan (Bungo Channel) plays an important role in modulating the water exchange between the Seto Inland Sea and Pacific Ocean. In this study, based on moored observations and model results from the Japan Coastal Ocean Predictability Experiment—Tides (JCOPE-T), the generation, propagation, and dissipation of semidiurnal internal tides in the Bungo Channel are investigated. Observational results indicate that semidiurnal internal tides induce strong baroclinic currents reaching 0.3 m/s. Their energy shows obvious spring-neap tidal cycles, generally coinciding with the local barotropic tidal forcing. By conducting the empirical orthogonal function analysis, we find that the observed semidiurnal internal tides are mainly dominated by the first two baroclinic modes. The JCOPE-T results suggest two main generation sites for semidiurnal internal tides in the region: one is located at a narrow strait north of the Bungo Channel, while the other is at the shelf break south of the Bungo Channel. The latter makes a major contribution to the observed semidiurnal internal tides. Northward internal tides generated at the shelf break are superposed with those generated at the narrow strait, causing a complex interference pattern in the channel. The temporal variation of semidiurnal internal tides in the Bungo Channel is affected by several factors. The intraseasonal variation of semidiurnal internal tides can be modulated by the Kuroshio warm water intrusion (Kyucho) because the occurrence of Kyucho changes the stratification in the channel and hence affects the energy conversion. The seasonal variation of semidiurnal internal tides in the Bungo Channel is determined mainly by the seasonally varying stratification; while those generated at the shelf break are under the combined influence of seasonal stratification and background currents. Southward internal tides from the shelf break are refracted due to the spatially varying stratification and background currents. The varying Kuroshio path and strength modulate the refraction of internal tides.

    DOI: 10.1016/j.pocean.2024.103229

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  • Seasonal variation in the current field and development of a bottom cold water in Harima-Nada Reviewed

    Tong-u-dom, S, Morimoto, A, Leng, Q, Guo, X

    Journal of Oceanography   80 ( 1 )   1 - 20   2024.1

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  • Contribution of the open ocean to the nutrient and phytoplankton inventory in a semi-enclosed coastal sea

    Qian Leng, Xinyu Guo, Junying Zhu, Akihiko Morimoto

    Biogeosciences   20 ( 20 )   4323 - 4338   2023.10

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    Publishing type:Research paper (scientific journal)   Publisher:Copernicus GmbH  

    Abstract. The semi-enclosed coastal seas serve as a transition zone between land and the open ocean, and their environments are therefore affected by both. The influences of land were noticed but that of the open ocean were usually neglected. The Seto Inland Sea (SIS), which is connected to the Pacific Ocean, is a typical representative of semi-enclosed seas. To quantitatively assess the inventory of nutrients originating from land and the open ocean, as well as their supported phytoplankton in the SIS, we developed a three-dimensional coupled hydrodynamic–biogeochemical model and embedded a tracking technique in it. Model results showed that the open ocean contributes 61 % and 46 % to the annual inventory of dissolved inorganic nitrogen (DIN) and phytoplankton in the SIS, respectively. This proportion has apparent spatial variations, being highest near the boundary with the open ocean, decreasing from there towards the interior area of the SIS, and being lowest in the nearshore areas. The open ocean imports 799 mol s−1 of DIN to the SIS, 25 % of which is consumed by biogeochemical processes and 75 % of which is delivered again to the open ocean. Such a large amount of oceanic nutrient input and its large contribution to the inventory of DIN and phytoplankton suggest the necessity of considering the impact of open-ocean variabilities in the management of the land loading of nutrients for the semi-enclosed seas.

    DOI: 10.5194/bg-20-4323-2023

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  • Year-to-year variations in the third branch of the Tsushima Warm Current in the Japan Sea Reviewed

    Morimoto, A, Ito, M, Takikawa, T

    Coastal altimetry: case studies from Asian shelf seas   215 - 230   2023.7

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    Authorship:Lead author, Corresponding author   Publishing type:Research paper (scientific journal)  

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MISC

  • マクロ沿岸海洋学「沿岸域と黒潮流域の双方向物質輸送と生物生産への影響評価」

    遠藤貴洋, 郭新宇, 小針統, 張勁, 仁科文子, 吉江直樹, 中村啓彦, 森本昭彦, 木田新一郎, 滝川哲太郎

    水産海洋研究   88 ( 2 )   2024

  • Impact of yearly variations in oceanic nutrient input on nutrients inventory in Seto Inland Sea

    LENG Qian, GUO Xinyu, MORIMOTO Akihiko

    日本海洋学会大会講演要旨集(Web)   2023   2023

  • Flux of oceanic nitrogen into and its contribution to nitrogen inventory in the Seto Inland Sea

    LENG Qian, GUO Xinyu, MORIMOTO Akihiko

    日本海洋学会大会講演要旨集(Web)   2022   2022

  • Seasonal variations in currents in the Harima-Nada and occurrence of the Bottom Cold Water

    TONG-U-DOM Siraporn, MORIMOTO Akihiko, GUO Xinyu, LENG Qian

    日本海洋学会大会講演要旨集   2021   2021

  • 沿岸水域差から推定した山口県見島周辺海域を通過する対馬暖流沿岸分枝の流量変動

    橋本涼介, 滝川哲太郎, 渡邉俊輝, 千手智晴, 森本昭彦

    水産海洋研究   83 ( 2 )   137   2019.5

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    Language:Japanese   Publishing type:Research paper, summary (national, other academic conference)  

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Presentations

  • 若狭湾の水温変動と沖合の流動変動の関連性の検討

    大西徹, 兼田淳史, 桂田慶裕, 森本昭彦, 伊藤雅

    2018年度日本海洋学会秋季大会  2018.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 2つの潮流調和定数の差の評価

    滝川哲太郎, 森本昭彦, 千手智晴

    2018年度日本海洋学会秋季大会  2018.9 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 豊後水道の海洋物理現象

    森本昭彦

    愛媛大学沿岸環境科学研究センター共同利用研究集会 豊後水道研究会  2018.8 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 豊後水道の底入り潮

    森本昭彦, 浅原貫太, 前谷佳奈, 滝川哲太郎

    九州大学応用力学研究所共同利用研究集会 日本海及び日本周辺海域における環境急変現象(急潮)のモニタリング、モデリング及びメカニズム解明に関する研究集会  2018.8 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 山口県見島周辺海域を通過する対馬暖流沿岸分枝の流量推定

    橋本涼介, 滝川哲太郎, 渡辺俊輝, 森本昭彦

    北海道大学低温科学研究所研究集会宗谷暖流を始めとした対馬暖流系の変動メカニズム  2018.7 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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Awards

  • 速水論文賞

    2022.9   日本海洋学会沿岸海洋研究会  

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Research Projects

  • A study on the nutrients supply from open ocean to coastal areas with a special attention on the relative position of boundary currents and coastal areas

    2023.4 - 2027.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

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    Grant amount:\18850000 ( Direct Cost: \14500000 、 Indirect Cost:\4350000 )

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  • Understanding of nutrient cycle in the Upper Gulf of Thailand toward resolving eutrophication

    2022.10 - 2025.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

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    Grant amount:\20150000 ( Direct Cost: \15500000 、 Indirect Cost:\4650000 )

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  • Nutrient supply system from the Pacific Ocean to coastal seas; Understanding of bottom intrusion in Bungo Channel

    2020.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)  Grant-in-Aid for Scientific Research (B)

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    Authorship:Principal investigator 

    Grant amount:\18070000 ( Direct Cost: \13900000 、 Indirect Cost:\4170000 )

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  • 播磨灘を例とした瀬戸内海の栄養塩管理のための物理―底質―低次生態系モデルの開発

    2020.4 - 2023.3

    環境再生保全機構  環境研究総合推進費 

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    Authorship:Principal investigator 

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  • 宇和海の漁場環境に影響を及ぼす太平洋からの栄養塩供給メカニズムの解明

    2019.10 - 2020.9

    住友財団  環境研究助成 

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    Authorship:Principal investigator 

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Teaching Experience (On-campus)

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