15dee14e-7afc-41e0-9a9c-e5e9de0fb1e7 CERSAT Exploitation fpaf@ifremer.fr editor 2026-10-08T13:19:24.257618Z ISO 19115-3:2018 - Remote Sensing http://www.opengis.net/def/crs/EPSG/0/4326 ODYSSEA North-East Atlantic Sea Surface Temperature Gridded Level 3S Daily Multi-Sensor Observations, version 3, for the Copernicus Marine Service 2021-01-01 publication 3.0 IFR-L3S-ATL-ODYSSEA This dataset provide a times series of daily multi-sensor composite fields of Sea Surface Temperature (SST) foundation at ultra high resolution (UHR) on a 0.02 x 0.02 degree grid (approximately 2 x 2 km) for the North-East Atlantic (European North West shelf, Iberia, Bay of Biscay, Irish Sea down to Canary upwelling), every 24 hours. Whereas along swath observation data essentially represent the skin or sub-skin SST, the L3S SST product is defined to represent the SST foundation (SSTfnd). SSTfnd is defined within GHRSST as the temperature at the base of the diurnal thermocline. It is so named because it represents the foundation temperature on which the diurnal thermocline develops during the day. SSTfnd changes only gradually along with the upper layer of the ocean, and by definition it is independent of skin SST fluctuations due to wind- and radiation-dependent diurnal stratification or skin layer response. It is therefore updated at intervals of 24 hrs. SSTfnd corresponds to the temperature of the upper mixed layer which is the part of the ocean represented by the top-most layer of grid cells in most numerical ocean models. It is never observed directly by satellites, but it comes closest to being detected by infrared and microwave radiometers during the night, when the previous day's diurnal stratification can be assumed to have decayed. The processing combines the observations of multiple polar orbiting and geostationary satellites, embedding infrared of microwave radiometers. All these sources are intercalibrated with each other before merging. A ranking procedure is used to select the best sensor observation for each grid point. The processing is described on Copernicus Marine Service [SST_ATL_PHY_L3S_NRT_010_037 dataset] and users can refer to the user manual and quality documents available there for more details. This dataset is generated daily within a 24 delay and is therefore suitable for assimilation into operational models. It is produced in the frame of Copernicus Marine Service and the data available through various tools and protocols with a simple user registration from this service (product identifier: SST_ATL_PHY_L3S_NRT_010_037) at: https://data.marine.copernicus.eu/product/SST_ATL_PHY_L3S_NRT_010_037/ onGoing Helpdesk CERSAT cersat@ifremer.fr pointOfContact Ifremer / CERSAT > Satellite Data Processing and Distribution Center of the French Research Institute for Exploitation of the Sea cersat@ifremer.fr originator Ifremer / CERSAT > Satellite Data Processing and Distribution Center of the French Research Institute for Exploitation of the Sea distributor Jean-François Piollé Ifremer / LOPS >Laboratory for Ocean Physics and Satellite remote sensing jfpiolle@ifremer.fr author Emmanuelle Autret Ifremer / LOPS >Laboratory for Ocean Physics and Satellite remote sensing eautret@ifremer.fr author https://sextant.ifremer.fr/geonetwork/srv/api/records/15dee14e-7afc-41e0-9a9c-e5e9de0fb1e7/attachments/L3S%20ATL%20SST.png L3S%20ATL%20SST.png Oceanographic geographical features GEMET - INSPIRE themes, version 1.0 2018-01-01 publication 2018-07-27T14:39:48 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Ocean Temperature Cersat - Parameter 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_parameter CMEMS GHRSST Cersat - Project 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_project Less than 24 hours Cersat - Latency 2025-12-09 publication geonetwork.thesaurus.local.theme.cersat_latency /Ocean Temperature/Sea Surface Temperature Cersat - GCMD parameter 2024-01-04 publication geonetwork.thesaurus.external.theme.GCMDparameter CDS-CERSAT Centre de données ODATIS 2026-01-19 publication geonetwork.thesaurus.local.theme.odatis_centre_donnees Variables ODATIS 2023-10-13 publication 2023-10-13 publication geonetwork.thesaurus.local.theme.odatis_variables /Observational data/satellite Type de jeux de donnée ODATIS 2025-12-09 publication geonetwork.thesaurus.local.theme.type_jeux_donnee Sea temperature ODATIS aggregation parameters and Essential Variable names 2023-11-27 publication 2023-11-27 publication geonetwork.thesaurus.external.theme.NVS.OD1 free and open Piollé J.-F., Autret, E. (2018). ODYSSEA North East Atlantic Sea Surface Temperature Multi-sensor L3S Observations (CMEMS/SST_ATL_PHY_L3S_NRT_010_037) (Version 3) set. Copernicus Marine Service. Dataset accessed [YYYY-MM-DD]. DOI: 10.48670/moi-00310 grid 0.02 -21.00 13.00 9.00 62.00 East Atlantic 2021-01-01 composite L3S NetCDF 4 /home/ref-cersat-public/sea-surface-temperature/odyssea/l3s/atl/nrt/data/v3.0/ NETWORK:LINK Local path on Ifremer / Datarmor Data access https://catalogue.marine.copernicus.eu/documents/PUM/CMEMS-SST-PUM-010-037.pdf WWW:LINK User guide Product User Manual (PUM) https://data-cersat.ifremer.fr/data/sea-surface-temperature/odyssea/l3s/atl/nrt/data/v3.0/ WWW:LINK Ifremer HTTP server HTTPS https://catalogue.marine.copernicus.eu/documents/QUID/CMEMS-SST-QUID-010-037.pdf WWW:LINK Processing and validation Quality Information Document https://tds0.ifremer.fr/thredds/IFREMER-ATL-SST-L3-NRT-OBS/IFREMER-ATL-SST-L3-NRT-OBS_FULL_TIME_SERIE.html?dataset=IFREMER-ATL-SST-L3-NRT-OBS_FULL_TIME_SERIE WWW:LINK IFREMER-ATL-SST-L3-NRT-OBS_FULL_TIME_SERIE THREDDS https://syntool.ifremer.fr/?date=1683547200000&timespan=1d&extent=-9529557.194621_-352221.82071108_9255606.874129_8815329.6024237&center=-136975.160246_4231553.8908563&zoom=4&products=3857_ODYSSEA_SST_L3S_ATL&opacity=80&stackLevel=100.07&selection=1 WWW:LINK Syntool https://data.marine.copernicus.eu/product/SST_ATL_PHY_L3S_NRT_010_037/description WWW:LINK Product notices Dataset Homepage on Copernicus Marine Service https://nrt.cmems-du.eu/motu-web/Motu?action=describeproduct&service=SST_ATL_PHY_L3S_NRT_010_037-TDS&product=cmems_obs-sst_atl_phy_nrt_l3s_P1D-m WWW:LINK Copernicus MOTU https://doi.org/10.48670/moi-00310 DOI Digital Object Identifier (DOI)