CEFAS53859956-4b65-4dff-b4cd-665fa97f73aa 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 2025-09-11T12:41:24 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Particle size analysis data from sediment cores collected in the North Sea between 2023 and 2024 and the Celtic Sea during 2023 2025-09-11 publication 2025-09-11 revision 2025-04-16 creation CEFAS22177 https://data.cefas.co.uk These sample data are from sediment cores collected in the North Sea and the Celtic Seas on three surveys undertaken between 2023 and 2024 using a NIOZ (Royal Netherlands Institute for Sea Research design) Box Corer during 3 surveys conducted by the Research Vessel (RV) Cefas Endeavour. Sample were analysed for and data presented for Particle Size Analysis (PSA). 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 Department for Environment, Food and Rural Affairs (DEFRA) defra.helpline@defra.gov.uk owner notPlanned Sea bed Analysis Ecosystem Sediment GEMET, version 1.0 2008-06-01 publication Sediment grain size parameters SeaDataNet P02 parameter discovery vocabulary 2011-03-25 revision Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Sediment 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 These data are currently pending release and may be made available on request to Cefas at present. 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 environment 1.73881 1.74086 52.4581 52.4595 2023-05-20 2024-06-09 Unknown https://data.cefas.co.uk/view/22177 Cefas Data Portal information The Cefas Data Portal contains metadata records and data sets available to download and connect to in support of our commitment to open science. dataset INSPIRE Data Specification on Habitats and Biotopes – 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 These data are from the following areas and surveys. - CEND072023 – North Sea (Farnes Deep, Fulmar, & Dogger Bank) – May 20- th- to June 10- th- , 2023. - CEND172023 – Celtic Sea – November 9- th- to November 28- th- , 2023. - CEND092024 – North Sea (Farnes Deep, Fulmar, & Dogger Bank) - May 24- th- to June 9- th- , 2024. At each station within a survey a NIOZ Box Corer was deployed collecting up to 5 individual cores to a maximum sediment depth of 30cm. A 10cm diameter sub core was taken from cores designated for lead-210 and organic carbon & nitrogen (OCN), as well as the core for contaminants. The lead-210 ( 210Pb) and OCN core was sliced at 2cm intervals for CEND072023 and CEND172023, and 1cm for CEND092024. The contaminants core was sliced a 5cm intervals for all surveys. Full PSA was performed on slices from the lead-210 ( 210Pb), and the OCN cores, and a 63µm split on slices from the contaminant cores. Additional Day Grab samples were taken on CEND072023. Full PSA was performed on these samples. Full PSA sediment samples were defrosted prior to analysis, and a representative subsample was taken. The sediment samples were processed following the PSA methodology recommended by the National Marine Biological Analytical Quality Control (NMBAQC) Scheme (Mason, 2022).Laser diffraction is carried out on the <2mm sediment. The remainder of the subsample is wet split using a 1mm sieve. The >1mm sediment is oven dried then dry sieved at half phi intervals. The <1mm sediment is oven dried and the weight recorded. The sieve and laser data are then merged to produce a full Particle Size Distribution (PSD) at half phi intervals. Gradistat software (Blott and Pye, 2001) was used to produce all sediment statistics (e.g., mean, mode, skewness). Each sample was classified using modified Folk description as defined by Long (2006). 63 split sediment samples were defrosted prior to analysis and then wet split using a 63 μm sieve. The >63 μm sediment fraction is then oven-dried and the weight is recorded. The <63 μm sediment fraction is freeze-dried, the weight is recorded and then sent for metals analysis. The percentage mud is then calculated by ( <63 μm / >63 μm + <63 μm )*100. A data point can potentially have multiple Quality Flags (QFlags) which will be semicolon separated. Definition of each QFlag can be found in the QFlag text file attached to this record. This dataset was produced by work supported jointly by the Joint Nature Conservation Committee (JNCC) lead NC40 Offshore Marine Monitoring project funded by Department of Environment, Food, & Rural Affairs (Defra) under its flagship marine Natural Capital and Ecosystem Assessment (mNCEA) programme and by the Defra funded Carbon Management Project (project number MRD333). Find out more about mNCEA at `https://www.gov.uk/government/publications/natural-capital-and-ecosystem-assessment-programme`_ . References: Blott, S.J. and Pye, K. (2001) GRADISTAT: a grain size distribution and statistics package for the analysis of unconsolidated sediments. Earth Surface Processes and Landforms 26, 1237-1248. Long, D. ,2006. BGS detailed explanation of seabed sediment modified Folk classification. `http://www.searchmesh.net/PDF/GMHM3_Detailed_explanation_of_seabed_sediment_classification.pdf`_ Mason, C. 2022. NMBAQC's Best Practice Guidance. Particle Size Analysis (PSA) for Supporting Biological Analysis. National Marine Biological AQC Coordinating Committee, 84pp, First published 2011, updated January 2016 and 2022. `https://www.nmbaqcs.org/media/ibzlxdej/psa-guidance_update2022.pdf`_ .. _`https://www.gov.uk/government/publications/natural-capital-and-ecosystem-assessment-programme`: https://www.gov.uk/government/publications/natural-capital-and-ecosystem-assessment-programme .. _`http://www.searchmesh.net/pdf/gmhm3_detailed_explanation_of_seabed_sediment_classification.pdf`: https://eur02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.searchmesh.net%2FPDF%2FGMHM3_Detailed_explanation_of_seabed_sediment_classification.pdf&data=05%7C02%7Cpaul.nelson%40cefas.gov.uk%7Ca84ce48a64f34fbb046408dda41f2f09%7Ceeea3199afa041ebbbf2f6e42c3da7cf%7C0%7C0%7C638847176020933142%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=FNdMrL85U%2BucrrFlk1slM%2F50UUZultcnLF3lSCGKeWE%3D&reserved=0 .. _`https://www.nmbaqcs.org/media/ibzlxdej/psa-guidance_update2022.pdf`: https://eur02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.nmbaqcs.org%2Fmedia%2Fibzlxdej%2Fpsa-guidance_update2022.pdf&data=05%7C02%7Cpaul.nelson%40cefas.gov.uk%7C322946e850b54f4043e908ddeb87034b%7Ceeea3199afa041ebbbf2f6e42c3da7cf%7C0%7C0%7C638925687302866803%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=WBRcuhF83NsC4GaNcjs%2BvcGOM5alvccqov3NpKcMYEs%3D&reserved=0 MEDIN 3.1.1