著者

三宅 誠音 磯田 豊 今井 圭理 小熊 健治 澤田 光希

出版者

北海道大学大学院水産科学研究院

雑誌

北海道大学水産科学研究彙報 (ISSN:24353353)

巻号頁・発行日

vol.70, no.1, pp.1-11, 2020-08-24

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The shelf slope off Cape Erimo is very steep, and its slope width (L~30 km) is smaller than the internal radius deformation (λi~50 km). A simple model is used to investigate the dynamic response of Oyashio barotropic flow passing through this local steep slope area. Model results suggest that near-bottom Oyashio water cannot intrude from shelf area off Cape Erimo to Hidaka Trough, because inverse flow accompanied by the bottom trapped shelf wave is generated over the steep slope under the physical condition of L <λi. To confirm the existence of such inverse flow, hydrographic data at upstream and downstream both sides of shelf area off Cape Erimo were examined.