wdc-climate.de:5285901 eng; USA collection HDERA5_v1 Dr. Stefan Hagemann Helmholtz-Zentrum Hereon www.hereon.de pointOfContact 2026-02-04T10:21:32 ISO 19115 ISO 19115-2:2009 Global ERA5-based high-resolution river runoff (Version 1) 2025-07-08 publication 1 HDERA5_v1 doi:10.26050/WDCC/HDERA5_v1 Dr. Stefan Hagemann Helmholtz-Zentrum Hereon www.hereon.de Email: stefan.hagemann@hereon.de principalInvestigator Dr. Stefan Hagemann Helmholtz-Zentrum Hereon www.hereon.de Email: stefan.hagemann@hereon.de author WDCC publisher ERA5 is the fifth generation of atmospheric reanalysis (Hersbach et al., 2020) produced by the European Centre for Medium-Range Weather Forecasts (ECMWF). It provides hourly data on many atmospheric, land-surface, and sea-state parameters at about 31 km resolution. It is frequently used to force regional climate models (RCMs) or ocean models. However, it lacks crucial information on riverine freshwater inflows at the land-ocean boundary. The latter is an important flux in ocean model or Earth System model applications, as it is affecting salinity and marine stratification in coastal areas. Therefore, we extended ERA5 with high-resolution river discharge from 1940-2024. Analogous to Hagemann and Stacke (2022), the global hydrology model HydroPy (Stacke and Hagemann 2021) and the Hydrological Discharge (HD) model (Vs. 5.2, Hagemann et al. 2023; Hagemann et al. 2020) were used to simulate daily discharge time series over the whole globe at 1/12° horizontal resolution. HydroPy was driven by daily ERA5 forcing data from 1940-2024 to generate daily input fields of surface and subsurface runoff at the ERA5 resolution. In order to initialize the storages in the HydroPy model and to avoid any drift during the actual simulation period, we conducted a 30-years spin-up simulation by repeatedly using year 1940 of the ERA5 dataset as forcing. To generate river runoff, the HD model was operated globally at 5 arc minutes horizontal resolution. First, the forcing data of surface and sub-surface runoff simulated by HydroPy were interpolated to the HD model grid. Then, daily discharges were simulated with the HD model. This work used resources of the Deutsches Klimarechenzentrum (DKRZ) granted via the Hereon part of the Helmholtz shareholder resources budget. Moreover, ERA5 datasets provided by DKRZ DM via the DKRZ data pool were used. Dr. Stefan Hagemann Helmholtz-Zentrum Hereon www.hereon.de pointOfContact NetCDF CINAR CLICCS Discharge Subsurface runoff Surface runoff river runoff CC-BY-4.0: Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ eng; USA -180.0 180.0 -90.0 90.0 calendrical 1940-01-01 2024-12-31 info:eu-repo/grantAgreement/DFG//390683824/DE//EXC 2037: Climate, Climatic Change, and Society (CLICCS) surface_runoff_flux The surface called "surface" means the lower boundary of the atmosphere. Runoff is the liquid water which drains from land. If not specified, "runoff" refers to the sum of surface runoff and subsurface drainage. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. [CF-Standard Name]; unit: kg m-2 s-1 subsurface_runoff_flux Runoff is the liquid water which drains from land. If not specified, "runoff" refers to the sum of surface runoff and subsurface drainage. In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux density" in physics. [CF-Standard Name]; unit: kg m-2 s-1 water_volume_transport_in_river_channel The water flux or volume transport in rivers is the amount of water flowing in the river channel and flood plain. "Water" means water in all phases. [CF-Standard Name]; unit: m3 s-1 NetCDF 236459 https://www.wdc-climate.de/ui/entry?acronym=HDERA5_v1 information collection