Variability of current structure due to meso-scale eddies on the bottom slope southeast of Okinawa Island

Masanori Konda, Hiroshi Ichikawa, In Seong Han, Xiao Hua Zhu, Kaoru Ichikawa

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The relationship between the vertical profile of current on the bottom slope southeast of Okinawa Island and the offshore meso-scale eddy propagated from the east was examined by combined use of the data obtained by a moored upward-looking ADCP (Acoustic Doppler Current Profiler), PIES (Inverted Echo Sounder with Pressure gauge), hydrographic surveys and satellite altimetry during a period from November 2000 to August 2001. The variability of current component parallel to the isobath in the layer over 600 m is found to be markedly different from that in the layer below 600 m. The current variability in the upper and the lower layer can be well explained by the first and second modes of the EOF (Empirical Orthogonal Function) decomposition. The PIES and the sea surface height anomaly data suggest that the first mode represents the surface-trapped current associated with the approach of the offshore meso-scale eddy from the east, whereas the second mode has a bottom-intensified structure. The second mode velocity tends to delay to the first mode. The hydrographic data derived from CTD (Conductivity-Temperature-Depth meter) and PIES data along the line across the isobath suggest that the second mode component is generated by the interaction between the meso-scale eddy and the bottom topography.

Original languageEnglish
Pages (from-to)1089-1099
Number of pages11
JournalJournal of Oceanography
Issue number6
Publication statusPublished - Dec 2005

All Science Journal Classification (ASJC) codes

  • Oceanography


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