⚠️ This is the first operational version of the handbook, but it is still a work in progress and will be heavily updated during 2024! ⚠️

Hazard datasets#

The Copernicus Climate Change Service (C3S) Climate Data Store (CDS) provides access to a wide variety of climate-related data, including observational data from ground-based instruments, satellites and other sources, reanalysis data, and environmental and climate model projections.

Data in CDS follow strict quality control and guidance when it comes to the FAIR principle and metadata. The data can be accessed in various formats, such as netCDF, GRIB, and CSV, and can be used for a range of applications, including research, policy-making, and commercial activities.

Data in the CDS is available through the Climate Data Store Application Program Interface (API) service and CDS Toolbox. Users need to sign up for an account on the CDS website and use the CDS API or the web interface to download the required data.

Past climate datasets#

E-OBS gridded European observational dataset is calculated from station data acquired through the network of the European Climate Assessment & Dataset (ECA&D) project. The observational data is gridded to regular latitude-longitude grid and is available at 0.1 and 0.25 degrees horizontal resolution. The dataset is daily, meaning the observations cover 24 hours per time step. Temporal coverage spans from 1950 to present. Available variables on daily basis: mean, minimum and maximum temperature, total precipitation, mean sea level pressure, mean wind speed at 10-meter height, mean relative humidity and surface shortwave downwelling radiation (i.e. solar radiation) measured at Earth’s surface. The dataset covers the European land areas: 25N-71.5N x 25W-45E. The data files are in NetCDF-4 format and can be downloaded via C3S CDS - E-OBS daily gridded meteorological data for Europe from 1950 to present derived from in-situ observations and via ECA&D.

ERA5 and ERA5-Land reanalysis are the global atmospheric reanalysis datasets produced by the European Centre for Medium-Range Weather Forecasts (ECMWF). Reanalysis combines model data with observations from across the world into a globally complete and consistent dataset using the laws of physics. ERA5 datasets provide a comprehensive view of the Earth’s atmosphere, ocean and land-surface quantities with regular latitude-longitude grid available at 0.25 degrees horizontal resolution. Temporal coverage spans from 1950 to present and is updated daily with a latency of about 5 days. ERA5-Land has enhanced horizontal resolution compared to ERA5, but it covers only land areas. ERA5-Land is gridded to regular latitude-longitude grid and is available at 0.1 degrees horizontal resolution. Temporal coverage spans from 1950 to present and is updated monthly with a delay of about three months relatively to actual date. Both, ERA5 and ERA5-Land, dataset are provided hourly. A large number of atmospheric, ocean-wave and land-surface quantities needed in CRA can be downloaded via CDS both for both ERA5 - ERA5 hourly data on single levels from 1940 to present and ERA-Land - ERA5-Land hourly data from 1950 to present.

Both reanalysis data sets are widely used in climate research, weather forecasting, and other applications. ERA5 also includes an ensemble component at half the resolution to provide information on the synoptic uncertainty of its products. ERA5-land parameter uncertainty currently can be accessed using the equivalent ERA5 fields.

The UERRA Uncertainties in Ensembles of Regional ReAnalysis dataset contains reanalysis data of the atmosphere, the surface and near-surface as well as for the soil covering Europe. Climate variables are generated with the UERRA-HARMONIE and the MESCAN-SURFEX systems. The system uses global reanalysis data as lateral boundaries: ERA40 for the period 1961-1978, after that ERA-interim. UERRA uses a combination of advanced data assimilation techniques and high-resolution regional climate models to produce regional reanalysis at horizontal resolution of 11km (0.1 degrees). Temporal coverage spans from January 1961 to July 2019. The system provides analyses with 6-hour time step. Between the analyses, forecasts of the system are available with hourly resolution.


Fig. 7 The three stages of reanalysis; the amount of observational data used for the RA per area unit increases from the global to the surface reanalysis as indicated by the arrows. (Source: UERRA data user guide)#

The data files are in GRIB or NetCDF-4 format and can be downloaded via C3S CDS (Complete UERRA regional reanalysis for Europe from 1961 to 2019).

In addition to the standard atmospheric variables, UERRA also provides uncertainty estimates for each variable, which can be used to assess the reliability of the data and quantify the level of confidence in any climate-related analysis or decision-making process.

Future climate datasets#

CMIP5 and CMIP6 climate data are global climate model simulations produced by international research institutions as part of the Coupled Model Intercomparison Project (CMIP). The datasets provide daily and monthly projections of historical periods and future climate change from a large number of experiments and models under different scenarios of greenhouse gas emissions. Data is gridded to regular latitude-longitude grid with horizontal resolution of 0.125° x 0.125° to 5° x 5° depending on the model. CMIP5 and CMIP6 data covers the period from 1850 to 2100, including the historical runs for 1950-2005 (CMIP5) and 1950-2014 (CMIP6). Climate projection experiments follow the combined pathways of Shared Socioeconomic Pathway (SSP, CMIP6) and Representative Concentration Pathway (RCP, CMIP5 and CMIP6). The SSP and RCP scenarios provide different pathways of the future climate forcing. Both CMIP5 and CMIP6 data files are in NetCDF-4 format and can be downloaded via C3S CDS: CMIP5 daily data on single levels and CMIP6 climate projections.

EURO-CORDEX regional climate data is a dataset of high-resolution regional climate model simulations for Europe, produced by a consortium of European research institutions. The dataset provides projections of future climate change at a regional scale, with a resolution of 12.5 km. EURO-CORDEX data covers the period from 1950 to 2100, including the historical runs for 1950-2005. The CORDEX experiments are using the RCP 2.6, 4.5 and 8.5 scenarios providing different pathways of the future climate forcing. The datasets can be accessed from C3S CDS CORDEX regional climate model data on single levels and they are widely used in climate research, impact assessments, and adaptation planning at the regional level.