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Area of Science:

  • Oceanography
  • Fluid Dynamics
  • Instrumental Science

Background:

  • The oceanic surface boundary layer (OSBL) is crucial for air-sea interaction and climate.
  • Previous limitations in autonomous platforms hindered detailed OSBL velocity structure observation.
  • Advancements in acoustic Doppler current profilers (ADCPs) offer new possibilities.

Purpose of the Study:

  • To present instrumentation and techniques for long-term, targeted OSBL velocity structure observation.
  • To detail algorithms for ambiguity resolution in pulse-coherent Doppler measurements.
  • To evaluate statistical uncertainties in measured velocities.

Main Methods:

  • Utilizing autonomous platforms equipped with self-contained pulse-coherent ADCPs.
  • Implementing and demonstrating novel algorithms for Doppler velocity "unwrapping".
  • Employing the Nortek Signature1000 ADCP on a Lagrangian float for data acquisition.

Main Results:

  • Demonstrated capability for centimeter-scale velocity structure observation in the OSBL.
  • Validated techniques for accurate pulse-coherent Doppler velocity measurements.
  • Evaluated statistical uncertainty related to ADCP configuration.

Conclusions:

  • The developed instrumentation and techniques are effective for long-term OSBL observation.
  • The methods are broadly applicable to various autonomous and towed pulse-coherent ADCP applications.
  • This work advances the study of ocean turbulence and dynamics.