{"created":"2024-04-25T05:12:29.539172+00:00","id":2003383,"links":{},"metadata":{"_buckets":{"deposit":"bc4e47b1-d180-4415-9eed-7e1e339b3807"},"_deposit":{"created_by":10,"id":"2003383","owners":[10],"pid":{"revision_id":0,"type":"depid","value":"2003383"},"status":"published"},"_oai":{"id":"oai:fra.repo.nii.ac.jp:02003383","sets":["12:14:1716951205920"]},"author_link":[],"control_number":"2003383","item_10002_alternative_title_1":{"attribute_name":"その他（別言語等）のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"海面における収束発散の実測とその解釈","subitem_alternative_title_language":"ja"}]},"item_10002_biblio_info_7":{"attribute_name":"bibliographic_information","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1969-03","bibliographicIssueDateType":"Issued"},"bibliographicNumberOfPages":"14","bibliographicPageEnd":"14","bibliographicPageStart":"1","bibliographicVolumeNumber":"1","bibliographic_titles":[{"bibliographic_title":"南西海区水産研究所研究報告","bibliographic_titleLang":"ja"},{"bibliographic_title":"Bulletin of the Nansei Regional Fisheries Research Laboratory","bibliographic_titleLang":"en"}]}]},"item_10002_description_5":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"The horizontal convergence or divergence of sea water is one of the important factors governing the distribution of floating matters such as fish eggs, juveniles, drifting seaweeds, minute living foods for fish and various contaminations. The measurements are, however, very difficult with such current meters as GEK, owing to indefiniteness of position of the fix, limit of accuracy in the current velocity and difference in time between adjacent fixes. On use of the current drogue with a radar target and a big wooden cross as shown in Fig. 1, we succeeded in direct measurement of the horizontal convergence or divergence in the Kuroshio south of Shikoku in August 1967 on board the Shun' yo Maru. At the begenning of the measurement, four drogues were released at four apexes of a square with sides a quarter of a mile long (Fig. 2). Analyzing photographs of blips of the drogues taken every two hours from early morning to sunset, the area S of the quadrilateral ABCD were calculated based on eq. (2). The horizontal divergence Q were calculated from the time change in S based on eq. (1). When wind force is below 2 in the Beaufort scale, noise of reflection from wind waves aroundthe ship is limited within a small area on the radarscope (Fig. 3a). When wind force exceeds 3 in  the scale, the wind wave noise on the scope expands to some extent (Fig. 3b). The shape of the noise is not circular but oval as shown in Fig. 4. The best position of the ship to separate the blip of drogues from the noise is at a lccation 1/2 to 1 mile leeward from the drogues. When wind force exceeds 4 in the scale, the range of the noise becomes quite large, and this kind of measurement encounters an insuperable obstacle partly because of the increase in drifting speed of the drogues by the wind. The actual measurements were made three times, each of them starting on a traverse of the Kuroshio SSE of Cape Ashizuri, Shikoku. The hydrographic conditions before and during the measurements are shown in Figs. 5-9. The drogues were released at three points 5 miles offshore from the current maximum on August 24th, 2 or 3 miles inshore from the maximum on 25th and 5 miles inshore from the maximum on 26th (Fig. 10). The results are shown in Figs. 11-13. There is strong horizontal convergence along the streamline 2 or 3 miles inshore from the current maximum. On either side of the current maximum, 5 miles offshore or inshore, there is strong divergence. The order of the magnitude amounts to 10-4 sec-1 (Fig. 13). If the horizontal divergence or convergence of this magnitude would be vertically uniform within the surface mixed layer, the layer would change in thickness by an unreal rate as shown in Table 1 calculated based on eq. (3). Accordingly, the assumption of uniform divergence or convergence should be given away. The actual feature might be in such ways that the divergence or convergence in the upper layer of the surface mixed layer be mostly compensated by the convergence or divergence in the lower layer, and that there be two systems of helical motion facing each other, forming a convergent zone lccated a few miles. inshore from the current maximum (Fig. 14).","subitem_description_language":"en","subitem_description_type":"Abstract"}]},"item_10002_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"南西海区水産研究所","subitem_publisher_language":"ja"},{"subitem_publisher":"Nansei Regional Fisheries Research Laboratory","subitem_publisher_language":"en"}]},"item_10002_radio_30":{"attribute_name":"item_10002_radio_30","attribute_value_mlt":[{"subitem_radio_item":"吉田","subitem_radio_language":"ja"}]},"item_10002_relation_16":{"attribute_name":"情報源","attribute_value_mlt":[{"subitem_relation_type_id":{"subitem_relation_type_id_text":"nnf_k_1_1","subitem_relation_type_select":"Local"}}]},"item_10002_relation_17":{"attribute_name":"関連サイト","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_language":"ja","subitem_relation_name_text":"日本農学文献記事索引(agriknowledge)"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://agriknowledge.affrc.go.jp/RN/2010841375","subitem_relation_type_select":"URI"}}]},"item_10002_source_id_11":{"attribute_name":"item_10002_source_id_11","attribute_value_mlt":[{"subitem_source_identifier":"AN00181988","subitem_source_identifier_type":"NCID"}]},"item_10002_source_id_9":{"attribute_name":"item_10002_source_id_9","attribute_value_mlt":[{"subitem_source_identifier":"0388-841X","subitem_source_identifier_type":"PISSN"}]},"item_access_right":{"attribute_name":"アクセス権","attribute_value_mlt":[{"subitem_access_right":"metadata only access","subitem_access_right_uri":"http://purl.org/coar/access_right/c_14cb"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"川合, 英夫","creatorNameLang":"ja"}],"familyNames":[{"familyName":"川合","familyNameLang":"ja"}],"givenNames":[{"givenName":"英夫","givenNameLang":"ja"}]},{"creatorNames":[{"creatorName":"坂本, 久雄","creatorNameLang":"ja"}],"familyNames":[{"familyName":"坂本","familyNameLang":"ja"}],"givenNames":[{"givenName":"久雄","givenNameLang":"ja"}]},{"creatorNames":[{"creatorName":"百田, 方子","creatorNameLang":"ja"}],"familyNames":[{"familyName":"百田","familyNameLang":"ja"}],"givenNames":[{"givenName":"方子","givenNameLang":"ja"}]}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"item_resource_type","attribute_value_mlt":[{"resourcetype":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"黒潮表層水の収束発散に関する研究(1)","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"黒潮表層水の収束発散に関する研究(1)","subitem_title_language":"ja"},{"subitem_title":"A STUDY ON CONVERGENCE AND DIVERGENCE IN SURFACE LAYER OF THE KUROSHIO – I DIRECT MEASUREMENT AND INTERPRETATION OF CONVERGENCE AND DIVERGENCE AT THE SURFACE","subitem_title_language":"en"}]},"item_type_id":"10002","owner":"10","path":["1716951205920"],"pubdate":{"attribute_name":"PubDate","attribute_value":"2024-04-25"},"publish_date":"2024-04-25","publish_status":"0","recid":"2003383","relation_version_is_last":true,"title":["黒潮表層水の収束発散に関する研究(1)"],"weko_creator_id":"10","weko_shared_id":-1},"updated":"2025-04-25T02:27:31.846502+00:00"}