Rapid Variability in the Japan/East Sea. Basin Oscillations, Internal Tides, and Near-Inertial Oscillations
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
Pagination or Media Count:
Many processes contribute to the variations of currents, sea surface height SSH, and thermocline depth in marginal seas. Energetic examples range broadly over time scales from slow mesoscale and interannual variations to rapid basin oscillations, internal tides, and near-inertial oscillations. Our measurement array in the JapanEast Sea JES offered a special opportunity to study these processes simultaneously, revealing important interconnections among them. The PIES pressure- guage-equipped inverted echo sounder experiment in the Ulleung Basin of the southwestern JES was originally designed to investigate the dynamics of meandering currents and eddies in the upper and deep ocean. For those purposes, we low-pass filtered the measurements to examine mesoscale variability. The companion papers by Watt et al.this issue and Mitchell et al. 2OO5a describe the mesoscale circulation patterns, including evolution and propagation of warm and cold eddies. The acoustic-echo-time records also included energetic short period signals. which dominated the bottom pressure record. Within the JES the barotropic or surface tidal amplitudes are so small 10cm, compared to I m typically in mid-ocean that these energetic short-period signals stood out and demanded our attention. We present here an overview of three aspects of short-period variability less than about 10 days observed in the JES, even though short-period phenomena were originally outside our main objective.
- Physical and Dynamic Oceanography