Validation of surface wave spectral measurements from velocity profiling floats

EM-APEX floats have primarily been used to measure subsurface ocean velocities for the purpose of studying ocean dynamics and the vertical structure and shear of currents. However, the motionally-induced voltage sensed by the EM-APEX also contains signals from surface wave orbital velocities, and the time taken to pass through the top ∼100 m of the water column is sufficient to estimate a full spectrum of surface wave amplitudes with periods from 3–25 seconds (i.e., including both wind seas and long swell) with each profile. The addition of surface wave measurements expands the abilities of the EM-APEX to include measuring the dynamics of waves and their interactions with surface and sub-surface currents. Following procedures developed by Hsu (2021) and D’Asaro (2015), we tested and analyzed the performance of EM-APEX floats as surface wave measuring instruments against other in-situ wave-measuring platforms. Data from a 2017 field study..., , , # Data from: Validation of surface wave spectral measurements from velocity profiling floats

[https://doi.org/10.5061/dryad.4qrfj6qhr](https://doi.org/10.5061/dryad.4qrfj6qhr)

This repository contains all the necessary data for reproducing the results and figures from Stadler, et al. 2025, Validation of Surface Wave Spectral Measurements from Velocity Profiling Floats.

## Description of the data and file structure

The all the data is contained within the FigureData.zip. When uncompressed, this contains nine folders, labelled Fig1 -> Fig9. The \".npz\" file containing the data used to make each figure. The \".npz\" file format is a compressed python numpy data format, which can then be loaded in python using the numpy command np.load(). The data in each \".npz\" file is structured as a dictionary, and the data in each file is described below:

Fig1/fig1_data.npz:

* \"apex_locs\": Python dictionary containing lat/lon positions for each float during the deployment. Dictionary keys are float ...,