Acoustic backscatter profile data for Mixed Layer Depth for the Peltic surveys in the eastern Celtic Seas and English Channel from 2012 to 2019

Backscatter data at 200 kHz recorded with a calibrated multifrequency Simrad EK60 system (additional frequencies, 38, 120 and 333 kHz) as part of fisheries survey Peltic designed to map and quantify the pelagic fish community. Peltic is an ongoing annual autumn pelagic survey on the research vessel Cefas Endeavour in the English Channel, Celtic Sea and Bristol Channel running from 2012-present. This data includes October surveys from 2012-2019. Also included are survey strata to show sampling locations.

Mean volume backscattering strength profiles (Sv) at 200kHz exported ping by ping. The export was done on the Sv after resampling (10 pings horizontally and 0.3 m vertically) and median filtering. The profiles are organized in rows with one row representing one ping. No Sv threshold was applied.

Strata are defined based on ecologically coherent areas each of which is acoustically sampled by a series of transects.
Please see paper for more information; [Relationships between acoustic scattering layers and ocean stratification: An acoustic approach to estimate mixed layer depth