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東北海区における暖水塊の消長(1)
https://fra.repo.nii.ac.jp/records/2007228
https://fra.repo.nii.ac.jp/records/2007228155909ef-90e8-4d70-8384-0ed8301a0aaf
| Item type | 紀要論文 / Departmental Bulletin Paper(1) | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2024-06-10 | |||||||||||
| タイトル | ||||||||||||
| タイトル | 東北海区における暖水塊の消長(1) | |||||||||||
| 言語 | ja | |||||||||||
| 言語 | ||||||||||||
| 言語 | jpn | |||||||||||
| 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 | metadata only access | |||||||||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||||||||
| 著者 |
武藤, 清一郎
× 武藤, 清一郎× 黒田, 隆哉× 荒井, 永平
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | The sea condition in the North-eastern sea of Japan depends mainly on the trends of the Kuroshio, Oyashio and the Tsugaru warm current systems. Especially the transition area east of Sanriku or so-called polar frontal zone between the Oyashio and Kuroshio area, is characterized by the distribution of large and small warm and cold water masses (eddies) derived from the three current systems mentioned above. From the accumulation of the results obtained by oceanographical surveys in recent years, their structures and movements can be analized oceanographically to some extent. However the mechanism of their formation and the process of their decay are not yet thoroughly clear. So a study on the life cycles-the processes from birth to death-of warm water masses is needed. In the present paper the hydrographic states of the warm water masses are investigated from the results obtained by the Oceanographic Division of the Tohoku Regional Fisheries Research Laboratory and also by other oceanographic offices. 1) In 1970, '71 and '72 the large scale warm water masses were separated (cut off) from the Kuroshio area (south side of the Kuroshio front or the Kuroshio Extention) and from the Kuroshio Branch (northward stretch of high temperature and salinity water from the Kuroshio current). They remained off Sanriku for half a year, one year or more. On the contrary in 1973 and '74 the formation of warm water masses were seen only from the Kuroshio Branch and they lasted for only three or four months. 2) The separation from the Kuroshio area occurs when the amplitude of meander of the current path exceeds 120 sea miles. If the formation occurs near the parting area of the current, the mechanism of separation from the Kuroshio Branch seems to be the same as that from the Kuroshio area. However if the formation occurs near the point area of the Kuroshio Branch which intrude into the Oyashio area, it seems that the warm water mass is formed by a cutting off process by the strong meander of the Oyashio front. This type (of warm water mass) is sometimes called the warm water mass off Kushiro. 3) The structure of warm water mass corresponds to its origin (the Kuroshio area and the Kuroshio Branch) and it gradually varies as time passes. After a certain duration a homogeneous layer (in temperature and in salinity) appears within the mass and it lasts for a long period. When the mass is not changing its position, sometimes there seems to be a new supply of water from the Kuroshio area or the Kuroshio Branch and in that case the inner structure of the mass changes with a rise of both temperature and salinity. Sometimes a formation of piled up homogeneous layers is seen. 4) The size of large warm water masses separated from the Kuroshio area is over 120 seamiles in diameter and 600 to 700 meters in depth respectively. It lasts for half a year to more than a year. The mass formed on November 1969 lasted for more than twenty months. The change in quality of the mass gradually advances by mixing with surrounding water. The heat exchange with the atmosphere through the surface layer of the mass is remarkable in winter. Cooling by the atmosphere hastens the decay of a mass. The separation of small water masses from the main water mass also markedly hastens the decay. 5) The size of water masses formed near the parting area of the current of the Kuroshio Branch are almost all 100 sea miles in diameter and nearly 500 meters in depth. The size of water masses formed near the point area of the Kuroshio Branch are less than ten sea miles in diameter and less than 300 meters in depth. The maximum water temperature of the 100 meter deep layer of the former water mass is 15°or 16˚C which is nearly the same as the Kuroshio. The latter is 10˚C. Also, the temperature of the separated water mass depends on the position from where it was separated. These types of water masses generally decay within six months and the process of decay seems to be foundamentally the same as that of the large water mass separated from the Kuroshio area but the mixing with the Oyashio water is remarkable. 6) Very few oceanographical surveys have been done on the process of the decay of warm water masses, so the mechanism of decay still remains to be solved. | |||||||||||
| 言語 | en | |||||||||||
| bibliographic_information |
ja : 東北区水産研究所研究報告 en : Bulletin of Tohoku Regional Fisheries Research Laboratory 巻 35, 号 tnf_k_35_31, p. 31-71, ページ数 41, 発行日 1975-12 |
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| 出版者 | ||||||||||||
| 出版者 | 東北海区水産研究所 | |||||||||||
| 言語 | ja | |||||||||||
| 出版者 | ||||||||||||
| 出版者 | Tohoku Regional Fisheries Research Laboratory | |||||||||||
| 言語 | en | |||||||||||
| item_10002_source_id_9 | ||||||||||||
| 収録物識別子タイプ | PISSN | |||||||||||
| 収録物識別子 | 0049-402X | |||||||||||
| item_10002_source_id_11 | ||||||||||||
| 収録物識別子タイプ | NCID | |||||||||||
| 収録物識別子 | AN00167637 | |||||||||||
| 情報源 | ||||||||||||
| 識別子タイプ | Local | |||||||||||
| 関連識別子 | tnf_k_35_31 | |||||||||||
| 関連サイト | ||||||||||||
| 識別子タイプ | URI | |||||||||||
| 関連識別子 | https://agriknowledge.affrc.go.jp/RN/2010131560 | |||||||||||
| 言語 | ja | |||||||||||
| 関連名称 | 日本農学文献記事索引(agriknowledge) | |||||||||||
