Two processes by which short-period fluctuations in the meander of the Kuroshio affect its countercurrent |
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| Institution: | 1. Bamfield Marine Science Centre, 100 Pachena Road, Bamfield, BC V0R 1B0, Canada;2. School of Aquatic and Fishery Sciences, Box 355020, University of Washington, Seattle, WA 98195, United States;1. Division of Infectious Diseases, Department of Medicine;2. Department of Entomology;3. Arizona Poison and Drug Information Center, University of Arizona, Tucson;1. Fisheries Research, NSW Department of Primary Industries, 32 Marina Drive Coffs Harbour, NSW 2450, Australia;2. University of Sydney, School of Life and Environmental Sciences, Edgeworth David Bld, Science Road, NSW 2006, Australia;3. Australian Institute of Marine Science, Townsville, QLD 4810, Australia |
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| Abstract: | Direct current velocity measurements in the countercurrent of the Kuroshio, south of Japan, were carried out to investigate the influence of short-period fluctuations in the small-scale meander of the Kuroshio on its countercurrent. When the Kuroshio took a path having a meander west of the Izu Ridge and approaching the Izu Peninsula, the countercurrent freely intruded into coastal seas with a period of 17 d and a phase velocity almost equal to that of the Kuroshio itself. However, when the Kuroshio did not significantly bend and deflect off the Izu Peninsula, even when taking the same path, the velocity of the countercurrent was considerably reduced and the periodic fluctuations propagated into the coastal seas as a continental shelf wave. The results indicate that a small change in the Kuroshio's path can cause a different process of propagation of the small-scale meandering; this difference probably explains why there are two kinds of phase velocity in coastal temperature fluctuations. |
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