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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第65巻 第1号 >


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タイトル: 日本海深層循環における底層水の形成
その他のタイトル: Formation of the Bottom Water in the Abyssal Circulation in the Japan Sea
著者: 荘司, 堅也 著作を一覧する
磯田, 豊 著作を一覧する
久万, 健志 著作を一覧する
荒巻, 能史 著作を一覧する
キーワード: Japan Sea
abyssal circulation
geothermal heating
density current
発行日: 2015年 3月16日
出版者: 北海道大学大学院水産科学研究院
誌名: 北海道大学水産科学研究彙報
巻: 65
号: 1
開始ページ: 17
終了ページ: 29
抄録: The abyssal waters in the Japan Sea vertically consist of the homogeneous Bottom Water (BW) and the weak-stratified Deep Water (DW). The formation of BW was inferred based on the spatial difference of their recent warming trends in potential temperature from 2000 to 2007 and the snapshot hydrographic observation in 2007 around a benthic front on the shallower sill region between the Yamato Basin (YB) and the Japan Basin (JB). It is found that there is no significant change in the thickness of BW, but both BW and DW showed clear warming trends. Geothermal heating from the seabed with order of 102 mW m-2 is plausible candidate having potential to cause the vertical mixing of BW and its reasonable warming trend with order of 10-3 °C yr-1. Considering upward advection of such heating from BW, the warming trends of DW at YB and JB are respectively examined using the one-dimensional advection-diffusive equation. The results suggest the existence of horizontal abyssal density current between both basins, i.e., on the sill, which was consistent with the snapshot spatial distributions of salinity and dissolved oxygen. If this local abyssal circulation may be continuously generated by the horizontal density gradient between both basins, the thickness of warming and vertical mixed BW will be always restricted by the sill depth.
資料タイプ: bulletin (article)
出現コレクション:第65巻 第1号


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