Regional Reanalysis COSMO-REA6 - Standardised Parameters

Project: COSMO-REA6 Regional Reanalysis - The high-resolution reanalysis system COSMO-REA6 has been developed based on the NWP model COSMO in a cooperation between Hans-Ertel-Centre for Weather Research (HErZ) and the German Meteorological Service (DWD). Initially, COSMO-REA6 was produced for 1995-2014 at University of Bonn (https://reanalysis.meteo.uni-bonn.de/), Hans-Ertel-Centre for Weather Research (HErZ), see https://www.herz.uni-bonn.de/wordpress/. It was extended from 2015 onwards by DWD. The DWD provides selected COSMO-REA6 output under https://opendata.dwd.de/climate_environment/REA/. The data provided via ESGF and WDCC underwent an additional CMIP/CORDEX-like standardisation ("CMORisation"), conducted in a cooperation between DKRZ and DWD within the OcMOD (Observations closer to MOdel Data) NFDI4Earth Pilot, and also comprises a different selection of parameters that was determined through a community survey (https://c6dreq.dkrz.de/files/ocmod_dreq.php). The CMORisation efforts within the NFDI4Earth Pilot were funded by the Deutsche Forschungsgemeinschaft (DFG - project number: 460036893). Summary: The regional reanalysis system for Continental Europe matches the domain of the CORDEX EURO-11 specifications, albeit at a higher spatial resolution, i.e., 0.055° (6 km) instead of 0.11° (12 km). It comprises the assimilation of observational data using the existing nudging scheme of COSMO complemented by snow, SST and soil moisture analysis modules and uses ERA‐Interim data as lateral boundary conditions. The reanalysis data set covers the period 1995 to August 2019. Due to the end of production of the forcing global reanalysis ERA-Interim, COSMO-REA6 has also been discontinued. A second version of COSMO-REA6, labeled "R6G2", that uses the data of the global reanalysis ERA5 as lateral boundary conditions, is currently under development at DWD.