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本州東岸水域の定点における水温変動の相関性 70371789 Hirai, Mitsuyuki 平井, 光行 ヒライ, ミツユキ Hirai 平井 ヒライ Mitsuyuki 光行 ミツユキ metadata only access In order to study thermal factors and their effects on the fluctuation of the oceanographic condition in the waters off the east coast of the Mainland of Japan, the temperature data were analyzed by the methods of the time series analysis for two fixed stations (northern statation IT and southern station IG; see Fig. 1) and of time section (isopleth) for five stations (see Fig. 1). The temperature data were obtained approximately at one month interval from April 1963 to December 1980. (1) In the upper 200 m layer, seasonal variation of water temperature was recognized and was more marked at shallower than deeper layers. (2) The phase of the fluctuation of water temperature in sub-surface layer was delayed from that in the surface layer and the lag time increased with depth. (3) Bellow a depth of 75 m layer the fluctuation of water temperature at southern station was delayed more than that at northern station and the cross correlation of coefficient showed that lag time was one month between IT and IG. Based on the above described results, some features of the fluctuation of water temperature were discussed as followed. (1) It is suggested that in the upper 50 m layer the seasonal variation of water temperature is mainly affected by the conduction and convection of heat. (2) It is suggested that bellow a depth of 75 m layer the seasonal variation of water temperature is affected by the advection of cold water related the Oyashio, however, the further consideration is needed on the fluctuation of salinity and the structure environment in this region. 距岸約30海里の本州東方沿岸水域で南北に5定点を選び1963年から1980年までの18年間ほは毎月1回の水温資料を,2定点(IT:39°15'N 142°37'E,IG:36°19'N 141°06'E)について時系列解析法,5定点について固定位置平均法を用いて解析し以下の結果を得た. (1) 各定点の200m以浅の水温は季節変動を示し浅いほどその傾向が顕者である.(2) 表面下の各層の水温変動は表面に対して遅れを示し深いほど遅れが大きい(200m深で3~4か月),50m以浅ではその遅れの程度は定点間で差がない.(3) 75m 以深では南側の定点の各層の水温変動は北側に対して遅れる(定点ITとIGでは1か月).これらのことから水温変動の特徴について以下のように考察した.(1) 50m以浅では水温の季節変動は熱伝導あるいは対流によるところが大きいと考える.(2) 75m以深では水温の季節変動は親潮系冷水の出現による効果が大きいと考えるが,水平·鉛直方向の移流を考慮するために塩分の季節変動,構造環境の検討が必要である. 東北区水産研究所 Tohoku Regional Fisheries Research Laboratory 1982-03-20 jpn departmental bulletin paper https://fra.repo.nii.ac.jp/records/2007284 tnf_k_44_53 https://agriknowledge.affrc.go.jp/RN/2010252134 日本農学文献記事索引(agriknowledge) AN00167637 0049-402X 東北区水産研究所研究報告 Bulletin of Tohoku Regional Fisheries Research Laboratory 44 7 53 59