Kyucho in Suruga Bay in Early March 1992.

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  • １９９２年３月上旬に発生した駿河湾の急潮
  • 1992ネン 3ガツ ジョウジュン ニ ハッセイ シタ スルガワン ノ キュウチョウ

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Abstract

In early March 1992, a steep temperature rise of about 5.5°C for 5.5 days was observed in the eastern part of the mouth of Suruga Bay and the western part of the bay head. The warm water in the eastern part of the bay mouth was influenced by an intrusion of the Kuroshio warm water. The intruded warm water moved cyclonically along the bay coast. The propagation speed of the warm water estimated from the time lag of the steep temperature rise and the distance between two mooring stations is about 0.79 m s-1. The estimated speed is similar to that of the coastal density current in a rotating fluid, 0.93 m s-1, theoretically derived by the same method as Kubokawa and Hanawa (1984). As a similar event that previously occurred in Sagami Bay was called kyucho, the steep temperature rise in this case is also called kyucho. The intrusion of the Kuroshio warm water into Suruga Bay as kyucho is related to a northward shift of the Kuroshio path. This northward shift seems to be related to the occurrence of a small scale meander of the Kuroshio off Irosaki. The temperature change induced by kyucho, has a little effect on the sea level change in the bay.

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