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Elevated turbulent and double-diffusive nutrient flux in the Kuroshio over the Izu Ridge and in the Kuroshio Extension
https://oacis.repo.nii.ac.jp/records/2217
https://oacis.repo.nii.ac.jp/records/2217c01e08b7-4e08-436a-ba2b-45a9195e826e
Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2021-09-21 | |||||
タイトル | ||||||
タイトル | Elevated turbulent and double-diffusive nutrient flux in the Kuroshio over the Izu Ridge and in the Kuroshio Extension | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題 | The Kuroshio, Turbulence, Double-Diffusion, Izu-Ridge, The Kuroshio Extension | |||||
資源タイプ | ||||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
著者 |
Nagai, Takeyoshi
× Nagai, Takeyoshi× Gandy Maria Rosales Quintana× Gloria Silvana Durán Gómez× Hashihama, Fuminori× Komatsu, Kosei |
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書誌情報 |
Journal of Oceanography 巻 77, p. 55-74, 発行日 2021-01-11 |
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抄録 | ||||||
内容記述 | While the Kuroshio is known to be a nutrient stream, as these nutrients are in dark subsurface layers, they are not immediately available for photosynthesis unless they are supplied to the sunlit surface layers. Recent microstructure observations have revealed that strong diapycnal mixing caused by the Kuroshio flowing over topographic features and double diffusion in the subsurface layers of the Kuroshio. However, it is still unclear how much nutrient flux can be provided by these microscale mixing processes. In this study, using an autonomous microstructure float and nutrient samplings, nutrient flux caused by the Kuroshio over the Izu Ridge, and that caused by double diffusion in the Kuroshio Extension are quantified. The nitrate diffu-sive flux is estimated to be >1mmolNm−2day−1 over a distance, 20–30 km near the Izu Ridge and >0.1mmolNm−2day−1 , which persists further downstream direction over 100 km along the Kuroshio, increasing the subsurface chlorophyll-a concen-tration in the region 200 km downstream. The double-diffusion-induced nitrate flux is estimated to be 1-10mmolNm−2day−1 in the pycnostad 26–26.5kgm−3 of the Kuroshio Extension, suggesting that whether this double-diffusion-induced nutrient flux in the subsurface layers can ultimately contribute to surface primary production depends on additional eddy up- and northward fluxes. |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0916-8370 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1007/s10872-020-00582-2 | |||||
情報源 | ||||||
関連識別子 | https://doi.org/10.1007/s10872-020-00582-2 | |||||
関連名称 | Publisher's Version/PDF (OpenAccess) | |||||
情報源 | ||||||
関連識別子 | https://kaken.nii.ac.jp/ja/search/?kw=19H01965 | |||||
関連名称 | KAKEN研究課題: 二台同時自由落下曳航観測手法を用いたマルチスケール混合現象とその影響に関する研究 | |||||
情報源 | ||||||
関連識別子 | https://kaken.nii.ac.jp/ja/grant/KAKENHI-PUBLICLY-16H01590/ | |||||
関連名称 | KAKEN研究課題: 黒潮源流が陸棚縁で生成する近慣性内部波と躍層における鉛直混合メカニズムの解明 | |||||
情報源 | ||||||
関連識別子 | https://kaken.nii.ac.jp/ja/grant/KAKENHI-PUBLICLY-18H04914/ | |||||
関連名称 | KAKEN研究課題: 沖縄トラフ・トカラ海峡で高鉛直波数近慣性波シアと乱流が卓越するメカニズム | |||||
情報源 | ||||||
関連識別子 | https://nrid.nii.ac.jp/ja/nrid/1000090452044/ | |||||
関連名称 | 研究代表者: 長井 健容 (東京海洋大学) | |||||
情報源 | ||||||
関連識別子 | https://kaiyo-gakkai.jp/jos/ | |||||
関連名称 | The Oceanographic Society of Japan | |||||
件名 | ||||||
主題 | 科学研究費研究成果 | |||||
出版者 | ||||||
出版者 | The Oceanographic Society of Japan | |||||
出版者 | ||||||
出版者 | Springer Nature | |||||
科学研究費研究課題 | ||||||
主題 | 二台同時自由落下曳航観測手法を用いたマルチスケール混合現象とその影響に関する研究 | |||||
科学研究費研究課題 | ||||||
主題 | Resolving multi-scale mixing processes and their impacts using a twin tow-yo microstructure profiling system | |||||
科学研究費研究課題 | ||||||
主題 | 黒潮源流が陸棚縁で生成する近慣性内部波と躍層における鉛直混合メカニズムの解明 | |||||
科学研究費研究課題 | ||||||
主題 | Near-inertial wave generations and diapycnal mixing in the Kuroshio origin regions near the continental shelf | |||||
科学研究費研究課題 | ||||||
主題 | 沖縄トラフ・トカラ海峡で高鉛直波数近慣性波シアと乱流が卓越するメカニズム | |||||
科学研究費研究課題 | ||||||
主題 | Mechanisms of dominant vertical high wavenumber near inertial shear and strong turbulence in the Okinawa Trough and the Tokara Strait | |||||
研究課題番号 | ||||||
内容記述 | 19H01965 | |||||
研究課題番号 | ||||||
内容記述 | 16H01590 | |||||
研究課題番号 | ||||||
内容記述 | 18H04914 |