ff2cd349-ecab-48e1-817a-1ed87dc0c4be Sextant Ifremer ZI Pointe du Diable Plouzane Brittany 29280 France sextant@ifremer.fr https://sextant.ifremer.fr/eng pointOfContact 2025-05-16T09:44:34.046018Z ISO 19115-3 - SEXTANT 1.0 EPSG:4326 ERA5 monthly averaged data on single levels from 1979 to present 2019-04-18 publication 2021-09-06 revision ff2cd349-ecab-48e1-817a-1ed87dc0c4be ERA5 is the fifth generation ECMWF reanalysis for the global climate and weather for the past 4 to 7 decades. Currently data is available from 1950, split into Climate Data Store entries for 1950-1978 (preliminary back extension) and from 1979 onwards (final release plus timely updates, this page). ERA5 replaces the ERA-Interim reanalysis. Reanalysis combines model data with observations from across the world into a globally complete and consistent dataset using the laws of physics. This principle, called data assimilation, is based on the method used by numerical weather prediction centres, where every so many hours (12 hours at ECMWF) a previous forecast is combined with newly available observations in an optimal way to produce a new best estimate of the state of the atmosphere, called analysis, from which an updated, improved forecast is issued. Reanalysis works in the same way, but at reduced resolution to allow for the provision of a dataset spanning back several decades. Reanalysis does not have the constraint of issuing timely forecasts, so there is more time to collect observations, and when going further back in time, to allow for the ingestion of improved versions of the original observations, which all benefit the quality of the reanalysis product. ERA5 provides hourly estimates for a large number of atmospheric, ocean-wave and land-surface quantities. An uncertainty estimate is sampled by an underlying 10-member ensemble at three-hourly intervals. Ensemble mean and spread have been pre-computed for convenience. Such uncertainty estimates are closely related to the information content of the available observing system which has evolved considerably over time. They also indicate flow-dependent sensitive areas. To facilitate many climate applications, monthly-mean averages have been pre-calculated too, though monthly means are not available for the ensemble mean and spread. ERA5 is updated daily with a latency of about 5 days (monthly means are available around the 6th of each month). In case that serious flaws are detected in this early release (called ERA5T), this data could be different from the final release 2 to 3 months later. So far this has not been the case and when this does occur users will be notified. The data set presented here is a regridded subset of the full ERA5 data set on native resolution. It is online on spinning disk, which should ensure fast and easy access. It should satisfy the requirements for most common applications. An overview of all ERA5 datasets can be found in this article. Information on access to ERA5 data on native resolution is provided in these guidelines. Data has been regridded to a regular lat-lon grid of 0.25 degrees for the reanalysis and 0.5 degrees for the uncertainty estimate (0.5 and 1 degree respectively for ocean waves). There are four main sub sets: hourly and monthly products, both on pressure levels (upper air fields) and single levels (atmospheric, ocean-wave and land surface quantities). The present entry is "ERA5 monthly mean data on single levels from 1979 to present". European Centre for Medium-Range Weather Forecasts Hans Hersbach ECMWF author Dick Dee ECMWF author Copernicus publisher https://sextant.ifremer.fr/geonetwork/srv/api/records/ff2cd349-ecab-48e1-817a-1ed87dc0c4be/attachments/130.png /Physical Environment Thèmes Sextant 2023-03-16 publication geonetwork.thesaurus.local.theme.sextant-theme Meteorological geographical features GEMET - INSPIRE themes, version 1.0 2018-07-27T14:39:48 publication geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme Data Mission Atlantic - Resources 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-resources Canary Current system Atlantic Ocean Mission Atlantic - Case Studies 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-case-studies /Atmosphere/Meteorology Mission Atlantic - BODC Parameters 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-bodc-parameters Environmental data Mission Atlantic - Data type (DMP) 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-data-type WP5 Assessing state, drivers and tipping points Mission Atlantic - Work Package 2023-03-16 publication geonetwork.thesaurus.local.theme.mission-atlantic-work-package International and global data portals Ocean Hackathon - Ville 2023-03-16 publication geonetwork.thesaurus.local.place.oh_ville Licence to use Copernicus Products grid 0.5 utf8 oceans -180.00 180.00 -90.00 90.00 1979-01-01 GeoTIFF 1.0 https://cds.climate.copernicus.eu/cdsapp#!/dataset/10.24381/cds.f17050d7?tab=overview WWW:LINK Copernicus access data https://www.ecmwf.int/en/newsletter/147/news/era5-reanalysis-production WWW:LINK-1.0-http--publication-URL ERA5 reanalysis is in production The CDS datasets are assessed by the Evaluation and Quality Control (EQC) function of C3S independently of the data supplier. EQC encompasses a framework of processes aimed to assure technical and scientific quality harmonized across all dataset types available through the CDS. During the EQC process, the documentation provided with the dataset is scrutinized and data are checked for usability and reliability.