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A new drifting device to measure internal waves in the upper ocean by Luca Centurioni and Peter Niiler lcenturioni@ucsd.edu Scripps Institution of Oceanography, La Jolla, CA,USA DBCP Scientific and Technical Workshop, 10/17/2005.

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  1. A new drifting device to measure internal waves in the upper oceanbyLuca Centurioni and Peter Niilerlcenturioni@ucsd.eduScripps Institution of Oceanography, La Jolla, CA,USADBCP Scientific and Technical Workshop, 10/17/2005 In collaboration with Vitalii Sheremet (GSO-URI), Ruo-Shan Tseng (National Sun Yat-sen University) and Jian-Hwa Hu (National Taiwan Ocean University)

  2. Outline • Instruments; • Experiment design; • Summary of observations; • Non-linearity; • Summary (and future plans).

  3. INSTRUMENTS FOR NLIW EXPERIMENT: 4 drifters with thermistor and pressure chain (20 sensors) , ADCPs, GPS and ARGOS

  4. Summary of observations First deployment, leg1,05/02/2005 Second deployment, leg 2, 05/07/2005 Taiwan South China Sea x x x x Luzon

  5. Summary of observations: trajectories of SVP drifters and absolute sea level

  6. Summary of observations: trajectories of SVP drifters (blue) and T-chains (red).

  7. Summary of observations T chain record, legs 1 & 2

  8. Summary of observations: wave packet and lift of chain 38 kHz Echo Sounder att. and T contour (T-Chain)

  9. Nonlinearity. Acoustic current meters profiles: buoy 56415, leg2 u v w

  10. Nonlinearity. Acoustic current meters profiles: buoy 56415, leg2 u v w

  11. Summary • Maps of absolute sea-level are helpful in planning the experiment; • Acceleration: vertical advection terms in horizontal momentum equations are of same order of the linear terms; • Future plans. Next experiment should try to address the following issues: a) modification of waves along their path; b) measure of horizontal advective terms (closely spaced array);

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