Variations of Kuroshio geostrophic transport south of Japan estimated from long-term IES observations
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Two inverted echo sounders were maintained on coastal and offshore sides of the Kuroshio south of Japan from October 1993 to July 2004. Applying the gravest empirical mode method, we obtained a time series of geostrophic transport. Estimated transports generally agree well with geostrophic transports estimated from hydrography. Their agreement with the hydrographic transports is better than that of transports estimated from satellite altimetry data. The geostrophic transport is expressed as the surface transport per unit depth multiplied by the equivalent depth. The geostrophic transport varies mostly with the surface transport and fractionally with the equivalent depth. Seasonal variation of the geostrophic transport has a minimum in March and a maximum in September, with a range of about one fifth of the total transport.
KeywordsInverted echo sounder geostrophic transport steric height seasonal variation satellite altimetry ASUKA Kuroshio
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- AVISO (2004): SSALTO/DUACS User Handbook. SALP-MUP-EA-21065-CLS.Google Scholar
- Chatterjee, S. and B. Price (1977): Regression Analysis by Example. John Wiley & Sons Inc., 228 pp.Google Scholar
- Fields, E., K. L. Tracey and D. R. Watts (1991): Inverted echo sounder data processing report. Tech. Rep. 91-3, Grad. Sch. of Oceanogr., Univ. of R.I., U.S.A.Google Scholar
- Imawaki, S., S. Aoki, Y. Fukuda, K. Ichikawa, S. Ito, H. Kawamura, M. Kubota, T. Kuragano, K. Matsumoto, T. Nagai, A. Sengoku and H. Yoritaka (2001b): Mass, heat and salt transports in the western North Pacific. Aviso News Lett., 8, 62–64.Google Scholar
- Kakinoki K., S. Imawaki, H. Uchida, H. Nakamura, S. Umatani, A. Nishina, H. Ichikawa and M. Wimbush (2006): Sea-surface dynamic height of the Kuroshio south of Japan estimated from inverted echo sounders and its error estimation. Rep. Res. Inst. for Applied Mechanics, Kyushu Univ., 130, 11–20 (in Japanese with English abstract).Google Scholar
- Kakinoki K., S. Imawaki, K. Ichikawa and S. Umatani (2007): Comparison of sea surface dynamic heights estimated from inverted echo sounder data and satellite altimeter data. Eng. Sci. Rep., Kyushu Univ., 29(1), 13–17.Google Scholar
- Park, J.-H., D. R. Watts, K. L. Tracey and D. A. Mitchell (2005): A multi-index GEM technique and its application to the southwestern Japan/East Sea. J. Atmos. Oceanic Technol., 22, 1282–1293.Google Scholar