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東シナ海大陸棚上への黒潮水の進入に関する数値研究
https://fra.repo.nii.ac.jp/records/2010859
https://fra.repo.nii.ac.jp/records/2010859c2e7e2c2-e3b3-4ee6-85a4-ea786ac5d52a
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
fra_k_23_11.pdf (8.0 MB)
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| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||
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| 公開日 | 2024-10-02 | |||||
| タイトル | ||||||
| タイトル | 東シナ海大陸棚上への黒潮水の進入に関する数値研究 | |||||
| 言語 | ja | |||||
| タイトル | ||||||
| タイトル | A numerical study on the intrusion of Kuroshio water onto the continental shelf of the East China Sea | |||||
| 言語 | en | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| キーワード | ||||||
| 言語 | en | |||||
| 主題Scheme | Other | |||||
| 主題 | intrusion of Kuroshio water; East China Sea; outflow from the Taiwan Strait; tide parameterization; bottom Ekman layer flow | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | departmental bulletin paper | |||||
| アクセス権 | ||||||
| アクセス権 | open access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||
| 著者 |
李, 浚銖
× 李, 浚銖 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The Kuroshio, which flows into the East China Sea （ECS） through the east of Taiwan, runs along the continental shelf break, and significantly affects the characteristics of the ECS water in terms of the exchange of heat, salt and nutrients. The main objectives of this study are to evaluate the contribution of the Kuroshio onto the ECS shelf, and to reveal the possible mechanism of the Kuroshio intrusion. In order to investigate the seasonal pattern of the intrusion from the Kuroshio and the behavior of the intruded Kuroshio water, numerical simulation and passive tracer experiment were executed using RIAM Ocean Model （RIAMOM）, which is a 3-dimensional, primitive equation model with a free surface. For the realistic simulation of the ECS circulation, tide effect was considered by parameterization of the M2 tide, enhancing the background turbulence as vertical eddy diffusivity and viscosity, and increasing the bottom friction where the tidal current is strong. Preliminary experiment, which released tracers in the Taiwan Strait and east of Taiwan, showed the tracer from the Taiwan Strait was mainly confined at the surface layer shallower than 80 m in summer and water mass originated from the Kuroshio occupied the lower layer. Based on the vertical profile of the tracer, two vertical sections along the 200 m isobath line were determined for the release of tracers: 0～80 m and 80～200 m. Passive tracer experiment confirmed the region of the main intrusion from the Kuroshio as indicated by previous studies: northeast of Taiwan and west of Kyushu. The total intruded volume transport across the 200 m isobath line was evaluated as 2.74 Sv in winter and 2.47 Sv in summer, while the intruded transport below 80 m was estimated to be 1.32 Sv in winter and 1.64 Sv in summer. The tracer experiments revealed that the east of Taiwan （122 ～ 123°E） is the main entrance of the Kuroshio intrusion onto the ECS shelf, and the intrusion from the Kuroshio to the central part of the shelf area, shallower than 80 m, takes place mainly through the lower layer northeast of Taiwan in summer as well, with a volume transport of 0.19 Sv. Comparative studies showed several components affecting the intrusion of the Kuroshio across the 200 m isobath line. The intrusion of Kuroshio water onto the shelf was less compared with a case without consideration of tide-induced bottom friction, especially northeast of Taiwan. The variations of the transport from the Taiwan Strait and the east of Taiwan have considerable effects on the intrusion of the Kuroshio onto the shelf. Momentum balance analysis along 122.58°E northeast of Taiwan, where the Kuroshio mainly intruded onto the shelf area of the ECS, showed that just north of Taiwan it was highly dominated by a geostrophic balance corresponding to surface elevation. In summer, while the northeastward strong current originated from the Taiwan Strait in geostophic balance passes north of 28°N, northward current occurs in the balance of the geostrophic com-ponents and the vertical friction component near the bottom. The northward current at the bottom layer north of 28°N induces the characteristic intrusion of the Kuroshio water onto the shelf area shallower than 80 m. The passive tracer experiments and the momentum balance analysis revealed that upper water of the Taiwan Warm Current （TWC） is originated from the Taiwan Strait, while deep water of the TWC is derived from the east of Taiwan by means of the bottom Ekman layer flow. Residence time in the Yellow Sea was estimated in both cases with and without consideration of tide effect by the tracer experiments which released the tracer at the inflow open boundaries. In the case with consideration of tide, the residence time was 5.3 years and 4.7 years for inclusion and exclusion of the Bohai Sea, respectively. Meanwhile, in the case without consideration of tide, the results showed remarkable decrease of the residence time to be 2.6 years and 1.7 years, respectively. The results emphasize that the consideration of tide effect is indispensable to the numerical simulation in the Yellow and East China Seas. | |||||
| 言語 | en | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 東シナ海大陸棚上へ進入する黒潮水の季節変動とそのメカニズムを，数値モデル（RIAMOM）を用いて調べた。200m 等深線を横切って陸棚側に輸送される黒潮水の流量は，冬季には2.74Sv，夏季には2.47Sv，そのうち，80m以深からの輸送流量は冬季には1.32Sv，夏季には1.64Sv となり，夏季に下層から進入する黒潮水が多くなることがわかった。また，水深80m より浅い陸棚域への黒潮水の進入は，主として夏季に台湾北東部の下層から供給される（流量0.19Sv）ことが示された。黒潮水の進入には，潮流に伴う海底摩擦の強化，台湾海峡を通過する台湾暖流の流量および台湾東から東シナ海に流入する黒潮自体の流量の変動が大きな影響を及ぼしており，夏季の浅い陸棚域への進入は台湾海峡を通過した流れによるボトムエクマン流が主因であることが示された。 | |||||
| 言語 | ja | |||||
| 書誌情報 |
ja : 水産総合研究センター研究報告 en : Bulletin of Fisheries Research Agency 巻 23, p. 11-90, ページ数 80, 発行日 2008-02 |
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| 出版者 | ||||||
| 出版者 | 水産総合研究センター | |||||
| 言語 | ja | |||||
| ISSN | ||||||
| 収録物識別子タイプ | PISSN | |||||
| 収録物識別子 | 1346-9894 | |||||
| 書誌レコードID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA11589591 | |||||
| 情報源 | ||||||
| 識別子タイプ | Local | |||||
| 関連識別子 | fra_k_23_11 | |||||
| 関連サイト | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010751352 | |||||
| 関連名称 | 日本農学文献記事索引（AgriKnowledge） | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
