TY - JOUR
T1 - Variability of current structure due to meso-scale eddies on the bottom slope southeast of Okinawa Island
AU - Konda, Masanori
AU - Ichikawa, Hiroshi
AU - Han, In Seong
AU - Zhu, Xiao Hua
AU - Ichikawa, Kaoru
N1 - Funding Information:
We wish to thank Captain, Prof. Y. Akishige and his officers and crewmembers of the training vessel, Kakuyo-maru of the Faculty of Fisheries, Nagasaki University for their professional support in the recovery of instruments. Mr. G. Chaplin kindly visited us and helped to maintain the PIESs. Drs. A. Ostrovskii, A. Kaneko, N. Gohda, S. Umatani, J.-H. Park devoted much of their valuable time to the deployment operations. Nagasaki Marine Observatory provided the hydrographic data on the OK line. Finally, special thanks are addressed to Drs. K. Takeuchi, T. Miura and T. Takigawa for their helpful comments on this study.
PY - 2005/12
Y1 - 2005/12
N2 - 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.
AB - 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.
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U2 - 10.1007/s10872-006-0024-z
DO - 10.1007/s10872-006-0024-z
M3 - Article
AN - SCOPUS:31444450357
SN - 0916-8370
VL - 61
SP - 1089
EP - 1099
JO - Journal of Oceanography
JF - Journal of Oceanography
IS - 6
ER -