CEFAS9931ace6-76fb-49ae-a12e-e9e29048841a 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 2025-04-29T12:43:03 EPSG Geodetic Parameter Registry 2022-01-07 revision WGS 84 Copernicus Chlorophyll for the UK shelf 1998 to 2014 2025-04-29 publication 2025-04-29 revision 2019-01-31 creation CEFAS19628 https://data.cefas.co.uk This is a chlorophyll product developed from CMEMS product OCEANCOLOUR_ATL_CHL_L3_REP_OBSERVATIONS_009_067: DATASET-OC-ATL-CHL-MULTI-CCI-L3-CHL_1KM_DAILY-REP-V02. There are two gridded products, yearly growing season (March-October) mean chlorophyll concentrations, and yearly growing season 90th percentile chlorophyll concentrations. The data covers the period 1998 - 2014 and is at 1km resolution. Means and 90th percentiles are also provided for a set of regions used for eutrophication assessments: MSFD regions, regional seas, WFD coastal areas, and Ecohydrodynamic regions. Files: *grseason_chl_mean_98_14_v2.nc and grseason_chl_90pc_98_14_v3.nc* contain gridded growing season means and 90th percentiles for the years 1998 to 2014, at approximately 1km resolution. *grseason_chl_mean_98_14_v2_5km.nc and grseason_chl_90pc_98_14_v3_5km.nc* contain gridded growing season means and 90th percentiles for the years 1998 to 2014, at approximately 5km resolution. *chl_MSFD_grseasonstats_1998_2014.csv *contains growing season chlorophyll means and 90th percentiles for each of the MSFD regions: Greater North Sea and Celtic Seas for the years 1990 - 2014. *chl_RegionalSeas_grseasonstats_1998_2014.csv *contains growing season chlorophyll means and 90th percentiles for each of the regional seas (1-8, also known as charting progress 2 regions) for the years 1990 - 2014. *chl_WFD_coastal_grseasonstats_1990_2014_v1b.csv* contains growing season chlorophyll means and 90th percentiles for each of the WFD coastal assessment regions, for the years 1990 - 2014. *chl_Ecohydro_grseasonstats_1998_2014.csv *contains growing season chlorophyll means and 90th percentiles for Ecohydrodynamic regions (cropped to the MSFD region extent). Corresponding shapefiles for all of these regions are also available ( *MSFD_regions.zip*, *Regional_seas.zip*, *WFD_coastal.zip*, *Ecohydrodynamic_regions_cropped.zip*) 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 European Commission info@publications.europa.eu owner notPlanned Chlorophyll pigment concentrations in the water column SeaDataNet P02 parameter discovery vocabulary 2011-03-25 revision Remote Sensing GEMET, version 1.0 2008-06-01 publication Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Unknown 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 2024' .. _`https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/`: https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ English environment -15.00 3.50 48.00 64.00 1998-03-01 2014-10-31 Delimited Geographic Information System Unknown https://data.cefas.co.uk/view/19628 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: CSV, ESRI Shapefile. The data can also be accessed via the WFS and WMS protocols. 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 This product was generated using E.U. Copernicus Marine Service Information. Daily values from remote sensing data (CMEMS product 009_067 DATASET-OC-ATL-CHL-MULTI-CCI-L3-CHL_1KM_DAILY-REP-V02) were used to obtain growing season 90th percentile values and means of chlorophyll concentrations to plot time series from 1998 to 2014. Processing was done in python (part A): 1. Load netcdfs 2. Subset to the area of interest (15°W to 4°E, 48°N to 64°N). 3. Export netcdf of subsetted data layer (for part B) 4. Calculate the 90th percentile over March-October for each year 5. Export netcdf of growing season 90th percentiles ( chl_grseason_90pc_1998_2014.nc) 6. Calculate the mean over March-October for each year 7. Export netcdf of growing season mean (chl_grseason_mean_1998_2014.nc) And R (part B) 1. Load netcdfs (from step 3 above) 2. Reshape data arrays to long data table format 3. Spatial overlay with regions 4. Calculate 90th percentile and mean over regions and growing season months for each year 5. Export csvs Additionally, to facilitate fast display in browsers the gridded netcdfs were resampled in R using bilinear interpolation to approximately 5km resolution. MEDIN 3.1.1