Fig.8．Temperature distributions at 200 m depth at four periods south of Japan. (1)December1-14, 1993, (2)December 15, 1993 to Jamary 5, 1994,(3)January 6-19, 1994, (4)January 19 to February 2, 1994.
5．Summary
On Jamary 9．1994, the Kyucho, the strong current with warm water entered Sagami Bay and destroyed the fishing set-net off the western corner of the bay head．The current, 2℃ warmer than the coastal water, moved cyclonically along the bay coast with the speed of 0.6-0.7ms-1．This speed agreed well with the maximum velocity of 0.65ms-1 observed at 10 m depth at the western coast of the bay head．The warm water intrusion is considered to be density current in a rotating field．The NOAA-IR images obtained before the Kyucho indicated the Kuroshio water intrusion through the Oshima west channel．The CTD observations showed that the region of high temperature and high saline water had the thickness of about 70 m and width of 15 km．The characteristics of the Kyucho are similar to those of the density current in a rotating fluid, theoretically derived by Kubokawa and Hanawa(1984b). The Kyucho in Sagami Bay was speculated to occur in relation to the change of the Kuroshio path from the nearshore non-large-meander path to the off shore non large-meander path.
