CEFASde86e821-2cc7-444e-b720-3a5214e54840 English dataset Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk pointOfContact 2026-02-11T02:45:51 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Acoustic backscatter profile data for Mixed Layer Depth for the Peltic surveys in the eastern Celtic Seas and English Channel from 2012 to 2019 2025-10-24 publication 2026-02-11 revision 2025-10-21 creation CEFAS22352 https://data.cefas.co.uk 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. Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk originator Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk custodian Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) Cefas Lowestoft Laboratory Pakefield Road Lowestoft Suffolk NR33 0HT UK data.manager@cefas.co.uk distributor Centre for Environment, Fisheries and Aquaculture Science, Lowestoft Laboratory (CEFAS) data.manager@cefas.co.uk owner Department for Environment, Food and Rural Affairs (DEFRA) defra.helpline@defra.gov.uk owner notPlanned Acoustic backscatter in the water column SeaDataNet P02 parameter discovery vocabulary 2011-03-25 revision Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Water column SeaVoX Vertical Co-ordinate Coverages 2010-05-18 revision Marine Environmental Data and Information Network MEDIN metadata record availability 2012-01-11 publication data.gov.uk MEDIN metadata record availability 2012-01-11 publication otherRestrictions noLimitations otherRestrictions Publicly available data licensed under the Open Government Licence v3.0 ( `https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/`_ ) – Please note the applicable attribution statement is as follows: ‘includes Crown copyright, Cefas 2025' .. _`https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/`: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ English oceans -7.50 -1.50 48.00 53.00 2012-10-23 2019-10-28 Binary Delimited Geographic Information System Unknown https://data.cefas.co.uk/view/22352 Cefas Data Portal download The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. Data is available in the following formats: Binary download, CSV, ESRI Shapefile. The data can also be accessed via the WFS and WMS protocols. dataset INSPIRE Data Specification on Oceanographic geographical features – Technical Guidelines 2013-12-10 publication false See the referenced specification Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 publication true See the referenced specification 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`_ .. _`relationships between acoustic scattering layers and ocean stratification: an acoustic approach to estimate mixed layer depth`: https://doi.org/10.1002/lom3.70010 MEDIN 3.1.1