TERRAPUB Journal of Oceanography

Journal of Oceanography, Vol. 56 (No. 1), pp. 31-41, 2000

Tidal Correction of Altimetric Data in the Japan Sea

Akihiko Morimoto1*, Tetsuo Yanagi2 and Akio Kaneko1

1Department of Civil and Environmental Engineering, Ehime University, Matsuyama 790-8577, Japan
2Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

(Received 3 February 1999; in revised form 23 April 1999; accepted 27 April 1999)

Abstract: Satellite altimetric data have been very useful in the study of variation in the eddy field of the ocean. In order to investigate the variation in the eddy field, we have to remove tidal signals from altimetric data. However, global tidal models do not have sufficient accuracy in marginal seas such as the Japan Sea. In this study, we carried out harmonic analysis of temporal fluctuations of sea surface height data in the Japan Sea measured by TOPEX/POSEIDON. We could eliminate the tidal signals from altimetric data of TOPEX/POSEIDON and also from ERS-2 altimetric data with use of the harmonic constants derived from TOPEX/POSEIDON and tide gauge data along the coast. We draw co-tidal and co-range charts in the Japan Sea using the result of the harmonic analysis of TOPEX/POSEIDON altimetric data and tide gauge data along the coast. The results obtained turn out to be very useful for the tidal correction of altimetric data from satellite in the Japan Sea.

*Corresponding author E-mail: amorimo@dpc.ehime-u.ac.jp

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