2023 Fiscal Year Final Research Report
Ocean-atmosphere interaction associated with coastal upwelling along the southern coasts of Sumatra and Java
| Project/Area Number |
18K03753
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17020:Atmospheric and hydrospheric sciences-related
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| Research Institution | Japan Agency for Marine-Earth Science and Technology |
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Principal Investigator |
Horii Takanori 国立研究開発法人海洋研究開発機構, 地球環境部門(大気海洋相互作用研究センター), 主任研究員 (20600430)
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| Project Period (FY) |
2018-04-01 – 2024-03-31
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| Keywords | 沿岸湧昇 / スマトラ・ジャワ島 / インド洋ダイポール現象 / 大気海洋相互作用 / バリアレイヤー / クロロフィルa / インド洋 / 気候変動 |
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| Outline of Final Research Achievements |
The goal of this study was to elucidate cold water upwelling and atmosphere-ocean interaction along the southwestern coasts of Sumatra and Java and to verify the causal relationship with the Indian Ocean Dipole (IOD). Using Argo data and satellite-based observation data, we demonstrated the vertical structure of ocean temperature and salinity associated with coastal upwelling and their temporal variations. We also utilized satellite-based surface chlorophyll-a data as an indicator of the coastal upwelling, identified the onset date of the upwelling south of Java, and clarified the relationship with the large-scale atmosphere-ocean interaction related to the subsequent development of IOD. These results indicate that accurate observation and understanding of the coastal upwelling will improve the predictability of the Indian Ocean climate.
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| Free Research Field |
海洋物理学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究は、全球海洋の沿岸湧昇域の中でほとんど大気や海洋の観測データが得られていなかったスマトラ・ジャワ島南西部の海域を対象として、最新の観測データを活用することで沿岸湧昇発生時の海洋構造を示すことができた。また、この沿岸湧昇がインド洋の大規模な短期気候変動現象であるインド洋ダイポール現象（IOD）発生の引き金になりうることを発見した。IOD は日本の夏季の天候など全世界の気候に影響をおよぼす現象であり、本研究の成果を活用することで、IOD のみならず世界の気候の予測性向上への貢献が期待できる。
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