Periodic Intrusion of Cold Water from the Pacific Ocean into the Bottom Layer of the Bungo Channel in Japan |
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| Authors: | Atsushi Kaneda Hidetaka Takeoka Eiji Nagaura Yoshitsugu Koizumi |
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| Institution: | (1) Center for Marine Environmental Studies, Ehime University, Bunkyo, Matsuyama 790-8577, Japan;(2) Konoike Construction Co., Ltd, 3-6-1 Kita Kyuhouji, Chuo, Osaka 541-0057, Japan;(3) Ehime Prefectural Fisheries Experimental Station, Shitaba, Uwajima 798-0104, Japan |
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| Abstract: | A cold-water intrusion, called a “bottom intrusion”, occurs in the lower layer of the Bungo Channel in Japan. It is an intrusion
from the shelf slope region of the Pacific Ocean margin in the south of the channel. In order to reveal the fundamental characteristics
of the bottom intrusion, we conducted long-term observations of water temperature at the surface and bottom layers of the
channel and 15-day current observations at the bottom of the shelf-break region. The long-term water temperature data indicated
that the bottom intrusion occurs repeatedly between early summer and late autumn, and its reiteration between early and mid-summer
causes a local minimum of water temperature in the lower layer in mid-summer. Moreover, the data revealed that most of the
bottom intrusions occurred in neap tidal periods. The current meter recorded a bottom intrusion with a speed of approximately
15 cm⋅s−1. The current meter also revealed that the intruded cold water slowly retreated back to the shelf slope region after the intrusion.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | Bottom intrusion shelf slope kyucho spring-neap modulation Bungo Channel |
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