Direct measurements of 4-dimensional variability in oceanic flow structures with a new towed phased array Doppler sonar

Abstract from the manuscript associated with this submission (Direct measurements of 4-dimensional variability in oceanic flow structures with a new towed phased array Doppler sonar): 
A Towed, Phased-Array Doppler Sonar (TPADS) has been developed. Using a phased array approach we form a fan of beams over a ~110 degree aperture that allows us to measure radial ocean velocities in three dimensions. The use of modern analog to digital converters developed for medical ultrasound enables a compact instrument that can be mounted on a small towed body, which allows us to isolate the instrument from the motion of the ship. The compact nature of the instrument also enables significant flexibility in deployment parameters. Here we describe this instrument and show two case studies from early deployments. The first shows the three dimensional shear field near the bottom in a region of complex bathymetry with slopes near-critical to the internal tide. We capture the three dimensional structur..., , , # Direct measurements of 4-dimensional variability in oceanic flow structures with a new towed phased array Doppler sonar

\[[https://doi.org/10.5061/dryad.k3j9kd5k7](https://doi.org/10.5061/dryad.k3j9kd5k7)]

## Description of the data and file structure

This set of data and scripts is provided alongside the manuscript \"Direct measurements of 4-dimensional variability in oceanic flow structures with a new towed phased array Doppler sonar\" to fulfill data availability requirements. Any data used to generate figures in that manuscript are included, as well as code to process data from raw, depth binned velocity estimates for each of the two main modes of operation discussed in the manuscript, normal-scan and surface scan. All code written by Devon Northcott ([[e-mail]](mailto:[e-mail])) and Austin Green ([[e-mail]](mailto:[e-mail])). Data is from the towed phased array Doppler sonar (TPADS) and auxiliary sensors. Most data is full rate depth-binned ve...,