黒潮の3つの代表的流路間における遷移過程

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  • Transition processes between the three typical paths of the Kuroshio.

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Transitions between the three typical paths of the Kuroshio south of Japan (the nearshore and offshore non-large-meander paths and the large-meander path) are described using sea level data at Miyake-jima and Hachijô-jima in the Izu Islands and temperature data at a depth of 200m observed from 1964 to 1975 and in 1980.<BR>In transitions between the nearshore and offshore non-large-meander paths the variation of the Kuroshio path occurs first in the region off Enshu-nada between the Kii Peninsula and the Izu Ridge and subsequently over the ridge. In the nearshore to offshore transition the offshore displacement of the path occurs first off Enshu-nada and then develops southeastwardly in the direction of Hachijo-jima. In the reverse transition shoreward displacement occurs first off Enshu-nada and then throughout the region west and east of the Izu Ridge. The position of the Kuroshio south of Cape Shiono-misaki (the southernmost tip of the Kii Peninsula) is almost fixed near the coast throughout these transition periods, and significant variations of the Kuroshio path only occur east of the cape. The nearshore to offshore and offshore to nearshore transitions can be estimated to take about 25 and 35 days, respectively, during which the, variation of the Kuroshio path over the Izu Ridge occurs for the last 11 and 25 days.<BR>The transitions between the non-large-meander and large-meander paths show that the large-meander path is mostly formed from the nearshore non-large-meander path and always changes to the offshore non-large-meander path.

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