Tetsuo Yanagi's research while affiliated with Ehime University and other places

Publications (5)

Article
大阪湾と紀伊水道における水質観測結果に基づいて, 大阪湾における懸濁・溶存態物質の収支をボックスモデルにより解析した。その結果, 夏季, 冬季ともに表層では懸濁物質(TSM), 懸濁態有機炭素(POC), 懸濁態有機窒素(PON)および懸濁態リン(PP)の生成量は分解を上回り, 中層と底層では分解が生成を上回っていた。表層におけるPOC, PONおよびPPの生成量の夏季と冬季の平均はそれぞれ1, 300, 175および27td-1であり, 河川等からの負荷量と比較してそれぞれ約10, 8および16倍大きい。表層で多量の懸濁態有機物が生成されるにもかかわらず, これらのうち約60%は大阪湾内で分解され, 湾外への流出は20~30%であった。一方, 溶存態無機窒素(DIN)と溶存態無機リン(DI...
Article
Seasonal variation in the transport of suspended matter across the East China Sea is investigated with the use of results of field observations and diagnostic numerical experiments. Suspended matter is transported from the shelf edge to the inner shelf in summer and from the inner shelf to the shelf edge in autumn and winter due to the vertical cir...
Article
In the Yellow Sea, the north-westerly wind dominates in winter and the existence of horizontal clockwise circulation has been suggested (Yanagi and Takahashi, 1993). The formation and variation mechanisms of this clockwise circulation is investigated using the wind forced numerical model which has a simplified basin configuration of the Yellow Sea....
Article
Seasonal variation of the water circulations in the East China Sea and the Yellow Sea is investigated with use of a robust diagnostic numerical model. Water circulations in four season are calculated diagnostically from the observed water temperature and salinity data from JODC (Japan Oceanographic Data Center) and wind data from COADS (Comprehensi...
Article
Daily mean sea-level data obtained along the southwestern Japan Sea coast (the San'In coast of Japan and the east coast of Korea) are analysed using a spectral analysis technique. It is found that a prominent peak period of sea-level variations exists at 3–5 days from January to April. These sea-level variations disappear from May to August. The re...

Citations

... Several pertinent hypotheses have been proposed. Oceanographic studies have suggested that transport of terrigenous material, mainly made up of fine particles, from the ECS shelf to the SOT takes place via strong wind-driven bottom flows and other current flows (Hu, 1994;Yanagi et al., 1996;Tang et al., 1999;Iseki et al., 2003;Tseng and Shen, 2003). For example, Tang et al. (1999) found intruded Kuroshio water, upwelled water, and shelf water mixed in the Mienhua Canyon head areas with outflow through the canyon, possibly facilitating transportation of particles as well. ...
... A large number of oceanographers have been paying great attention to the YSWC since it was proposed, as the YSWC is one of the most important hydrographic phenomena in the YS. The formation mechanism, characteristics, and the westward shift of the flow axis of the YSWC have been intensively studied based on temperature and salinity measurements (Chen et al., 1994;Lie et al., 2009Lie et al., , 2015, satellite observations (Wang and Liu, 2009;Wang et al., 2012;Guo et al., 2016;Hu et al., 2017), direct current measurements (Teague and Jacobs, 2000;Yu et al., 2010; and also numerical models (Takahashi et al., 1995;Mask et al., 1998;Riedlinger and Jacobs, 2000;Qiao et al., 2001;Huang et al., 2005;Ma et al., 2006;Tak et al., 2016). ...
... The tidal mixing front has a great impact on the three-dimensional circulation in summer. On the one hand, the tidal mixing front generates a basin-scale cyclonic circulation in the upper layer of the YS, which is known as the Yellow Sea Cold Water Mass circulation (YSCWMC) and has been reported in many observational and numerical studies (Beardsley et al., 1992;Feng et al., 1992;Yanagi and Takahashi, 1993;Naimie et al., 2001;Xu et al., 2003;Xia et al., 2006;Zhou et al., 2015;Lie and Cho, 2016). On the other hand, it triggers frontal upwelling over the slope in the YS (Lü et al., 2010). ...
... The Japan Sea is also one of the most eddy-rich areas in the world. The typical horizontal scale of eddies in the Japan Sea is about 100 to 150 km (Isoda et al. 1991;Park and Chung 1999). Based on the TOPEX/POSEIDON and ERS-2 altimetric data, Morimoto et al. (2000) found that the Yamato Basin and Tsushima Strait are the most energetic regions with high RMS variability of about 10 cm. ...