We thank Yuji Hasibe, Motohiko Kashima and Katsuhisa Yamada for processing and analyzing the current meter data. We also thank Mark Wimbush for valuable discussions. For TOPEX/POSEIDON altimetry data, we used products of the Ocean Altimeter Pathfinder Project provided by Goddard Space Flight Center of the National Aeronautics and Space Administration, U.S.A. Sea level data at Cape Ashizuri were provided by Japan Meteorological Agency. This study was a part of activities of the International Cooperative Research Programme on Global Ocean Observing System sponsored by the Ministry of Education, Science, Sports and Culture, Japan. It was also partly supported by the Core Research for Evolutional Science and Technology of Japan Science and Technology Corporation.
REFERENCES
1. A.M. Macdonald and C. Wunsch, Nature 382, 436 (1996).
2. H.L. Bryden, D.H. Roemmich and J.A. Church, Deep-Sea Res. 38, 297 (1991).
3. L.V. Worthington and H. Kawai, p.371-385 in Kuroshio-Its Physical Aspects, eds. H. Stommel and K. Yoshida; University of Tokyo Press (1972).
4. B.A. Taft, J. Mar. Res. 36, 77 (1978).
5. M. Takematsu, K. Kawatate, W. Koterayama, T. Suhara and H. Mitsuyasu, J. Oceanogr. Soc. Japan 42, 201 (1986).
6. S. Mizuno, K. Kawatate, A. Kaneko and T. Nagahama, Bull. Res. Inst. for Applied Mechanics, Kyushu Univ. 71, 1 (1991).
7. L.-L. Fu, E.J. Christensen, C.A. Yamarone Jr., M. Lefebvre, Y. Menard, M. Dorrer and P. Escudier, J. Geophys. Res. 99(C12), 24369 (1994).
8. K. Hasunuma and K. Yoshida, J. Oceanogr. Soc. Japan 34, 160 (1978).
9. C.-T. Liu, S.-P. Cheng, W.-S. Chuang, Y. Yang, T.N. Lee, W.E. Johns and H.-W. Li, Acta Oceanographica Taiwanica 36, 159 (1998).
10. H. Ichikawa and R.C. Beardsley, Deep-Sea Res. 40, 583 (1993).
11. Y. Sekine and K. Kutsuwada, J. Phys. Oceanogr. 24, 261 (1994).
12. M. Kawabe, J. Oceanogr. Soc. Japan 44, 293 (1988).
13. V. Zlotnicki, J. Phys. Oceanogr. 21, 599 (1991).
14. D.B. Chelton and A.M. Mestas-Nunez, Intl. WOCE Newsletter 25, 3 (1997).
15. B. Qiu, J. Phys. Oceanogr. 25, 1827 (1995).
16. T. Sakamoto and T. Yamagata, J. Mar. Res. 54, 261 (1996).
