Acoustic Tomography Measurement of Internal Tides in Bali Strait
Abstract
A reciprocal sound transmission experiment was carried out during June 10-13, 2015 along a cross-strait line in the Bali Strait with strong tidal currents to measure the vertical section structures of the range-averaged current and temperature at a 3 min interval. The five-layer structures of the range-averaged current and temperature in the vertical section were reconstructed by regularized inversion of the travel time data for two rays. The hourly-mean current showed the generation of nonlinear internal tides with amplitudes of 1.0-1.5 ms-1 and periods of 6 h superimposed on semidiurnal internal tides with amplitudes decreasing from the upper to lower layer. The hourly-mean temperature was characterized by variations with amplitudes of 1.0-1.5 oC and periods of 6 and 8 h. The current variations showed an out-of-phase relation between the upper and lower layers while the temperature data varied in-phase for all five layers. The two-day-mean current and temperature showed a stratified structure, varying from -0.6 to -0.1 ms-1 and from 23.8 to 28.0 oC, respectively. The five-layer current and temperature were significantly above the inversion errors. This study was supported by the National Program on Global Change and Air-Sea Interaction (GASI-IPOVAI-01-02) and the National Natural Science Foundation of China (grant numbers 41606113 and 41776107).
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMOS41E2056Z
- Keywords:
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- 3305 Climate change and variability;
- ATMOSPHERIC PROCESSESDE: 4522 ENSO;
- OCEANOGRAPHY: PHYSICALDE: 4532 General circulation;
- OCEANOGRAPHY: PHYSICALDE: 4576 Western boundary currents;
- OCEANOGRAPHY: PHYSICAL