Advertisement

Journal of Oceanography

, Volume 48, Issue 2, pp 155–177 | Cite as

Fluctuation of the sea surface dynamic topography southeast of Japan as estimated from Seasat altimetry data

  • Kaoru Ichikawa
  • Shiro Imawaki
Article

Abstract

The sea surface dynamic topography (the sea surface height relative to the geoid; hereafter abbreviated SSDT) can be divided into the temporal mean SSDT and the fluctuation SSDT around the mean. We use the optimal interpolation method to reduce the satellite radial orbit error and estimate the fluctuation SSDT southeast of Japan from Seasat altimetry data during the 17-day near-repeat mission. The fluctuation SSDT is further combined with the mean geopotential anomalies estimated from hydrographic data during the Seasat mission in order to give the approximated total SSDT, called here the composite SSDT (the approximated mean plus fluctuation SSDT's). The fluctuation SSDT is in accord with the low-frequency sea-level fluctuation recorded at tide gauge stations in the Japanese islands. The composite SSDT describes thoroughly variations of the location of the Kuroshio axis south of Japan determined on the basis of the GEK (Geomagnetic Electro-Kinematograph) surface velocities and the horizontal temperature distribution. The composite SSDT also agrees with oceanic variations east of Japan found in the temperature distribution at the depth of 200 m. These results confirm that the SSDT derived from altimetry data can provide fairly precise synoptic views of low-frequency oceanic phenomena.

Keywords

Interpolation Method Tide Gauge Japanese Island Altimetry Data Hydrographic Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bernstein, R. L., G. H. Born and R. H. Whritner (1982): SEASAT altimeter determination of ocean current variability.J. Geophys. Res. 87(C5), 3261–3268.Google Scholar
  2. Bretherton, F. P., R. E. Davis and C. B. Fandry (1976): A technique for objective analysis and design of oceanographic experiments applied to MODE-73.Deep-Sea Res.,23, 559–582.Google Scholar
  3. Byrne, H. M. and P. E. Pullen (1983): SEASAT-derived ocean surface topography: Comparison with coincident Kuroshio hydrographic data.J. Geophys. Res.,88(C4), 2621–2625.Google Scholar
  4. Cheney, R. E., J. G. Marsh and B. D. Beckley (1983): Global mesoscale variability from collinear tracks of SEASAT altimeter data.J. Geophys. Res.,88(C7), 4343–4354.Google Scholar
  5. De Mey, P. and Y. Menard (1989): Synoptic analysis and dynamical adjustment of GEOS 3 and SEASAT altimeter eddy fields in the Northwest Atlantic.J. Geophys. Res.,94(C5), 6221–6230.Google Scholar
  6. De Mey, P. and A. R. Robinson (1987): Assimilation of altimeter eddy fields in a limited-area quasi-geostrophic model.J. Phys. Oceanogr.,17, 2280–2293.Google Scholar
  7. Fu, L.-L. (1983): On the wave number spectrum of oceanic mesoscale variability observed by the SEASAT altimeter.J. Geophys. Res.,88(C7), 4331–4341.Google Scholar
  8. Fu, L.-L. and D. B. Chelton (1985): Observing large-scale temporal variability of ocean currents by satellite altimetry: With application to the Antarctic Circumpolar Current.J. Geophys. Res.,90(C3), 4721–4739.Google Scholar
  9. Glenn, S. M., D. L. Porter and A. R. Robinson (1991): A synthetic geoid validation of Geosat mesoscale dynamic topography in the Gulf Stream region.J. Geophys. Res.,96(C4), 7145–7166.Google Scholar
  10. Imawaki S, K. Ichikawa and S. Nishigaki (1992): Mapping the mean sea surface elevation field from satellite altimetry data using optimal interpolation,Marine Geodesy,15, 31–46.Google Scholar
  11. Japan Oceanographic Data Center (1980):Oceanographic Atlas of KER, Vol. 2, Tokyo, 48 pp.Google Scholar
  12. Lerch, F. J., J. G. Marsh, S. M. Klosko and R. G. Williamson (1982): Gravity model improvement for SEASAT.J. Geophys. Res.,87(C5), 3281–3296.Google Scholar
  13. Marsh, J. G., R. E. Cheney, T. V. Martin and J. J. McCarthy (1982): Computation of a precise mean sea surface in the eastern North Pacific using SEASAT altimetry.EOS Trans. AGU,63,No. 9, 178–179.Google Scholar
  14. Mazzega, P. and S. Houry (1989): An experiment to invertSeasat altimetry for the Mediterranean and Black Sea mean surfaces.Geophys. J.,96, 259–272.Google Scholar
  15. Menard, Y. (1983): Observations of eddy fields in the northwest Atlantic and northwest Pacific by SEASAT altimeter data.J. Geophys. Res.,88(C3), 1853–1866.Google Scholar
  16. Pattullo, J., W. Munk, R. Revelle, and E. Strong (1955): The seasonal oscillation in sea levelJ. Marine Res.,14, 88–156.Google Scholar
  17. Rapp, R. H. (1983): The determination of geoid undulations and gravity anomalies from SEASAT altimeter data.J. Geophys. Res.,88(C3), 1552–1562.Google Scholar
  18. Tai, C.-K. (1988): Geosat crossover analysis in the tropical Pacific. Part 1: Constrained sinusoidal crossover adjustment.J. Geophys. Res.,93(C9), 10621–10629.Google Scholar
  19. Tapley, B. D. and G. W. Rosborough (1985): Geographically correlated orbit error and its effect on satellite altimetry missions.J. Geophys. Res.,90(C6), 11817–11831.Google Scholar
  20. Tapley, B. D., G. H. Born and M. E. Parke (1982): The SEASAT altimeter data and its accuracy assessment.J. Geophys. Res.,87(C5), 3179–3188.Google Scholar
  21. Thiébaux, H. J. and M. A. Pedder (1987):Spatial Objective Analysis: With Applications in Atmospheric Science. Academic Press, London, 299 pp.Google Scholar
  22. Thompson, P. D. (1956): Optimum smoothing of two-dimensional fields.Tellus,8, 384–393.Google Scholar
  23. Willebrand, J., R. H. Käse, D. Stammer, H.-H. Hinrichsen and W. Krauss (1990): Verification of Geosat sea surface topography in the Gulf Stream extension with surface drifting buoys and hydrographic measurements.J. Geophys. Res.,95(C3), 3007–3014.Google Scholar
  24. Wunsch, C. (1986): Calibrating an altimeter: How many tide gauges is enough?J. Atmos. and Oceanic Tech.,3, 746–754.Google Scholar
  25. Wunsch, C. and V. Zlotnicki (1984): The accuracy of altimetric surfaces.Geophys. J. Roy. Astron. Soc.,78, 795–808.Google Scholar

Copyright information

© Journal of the Oceanographic Society of Japan 1992

Authors and Affiliations

  • Kaoru Ichikawa
    • 1
  • Shiro Imawaki
    • 2
  1. 1.Department of Geophysics, Faculty of ScienceKyoto UniversityKyotoJapan
  2. 2.Faculty of FisheriesKagoshima UniversityKagoshimaJapan

Personalised recommendations