Processed EK60 acoustics data associated with the manuscript: "Epipelagic to mesopelagic variability of acoustic backscatter in the California Current"

Filtered, cleaned and binned EK60 acoustic transects used in the analysis "Epipelagic to mesopelagic variability of acoustic backscatter in the California Current", Guiet J., Wall C., Srinivasan K. and Bianchi D. (2026). The original raw transects, accessible at https://www.ncei.noaa.gov/maps/water-column-sonar/ (see also source_raw_dataset_citation in each netCDF file), have undergone a suite of filters and have been binned (1m range x 30s). We removed impulsive noise, amplification and attenuation noise, background noise, echoes from the seafloor, and corrected for sound absorption and, when possible, transducer motion. The same set of processing parameters is applied to all transects (see manuscript). Each processed echogram includes the following: Sv : Multi-frequency Volume Backscattering Strength (dB re 1 m2/m3). Sv_mask : Mask of bottom, false bottom and other noises identified through manual inspection. frequency : Frequency of each sample (Hz). time : Time of each sample (days since 0001-01-01 00:00:01). range : Range of each sample (m). longitude : Mean longitude for each sample (degree). latitude : Mean latitude for each sample (degree). The echogram parameters used for the analysis (either pre-recorded on the echograms or updated based on calibration information) are also provided: Gain : Applied transducer gain (dB). Sa_corr : Applied Sa correction (dB). EBA : Applied equivalent beam angle (dB). Abs_coeff : Applied absorption coefficient (dB/km). Beam_angl_along : Applied beam angle alongship (degree). Beam_angl_athw : Applied beam angle athwartship (degree). Transmit_power : Applied transmit power (W). Pulse_length : Applied pulse duration (mu s). For more details see https://doi.org/10.1016/j.pocean.2026.103807.