To calculate the flood forecasts EFAS and GloFAS need the hydrological initial conditions for LISFLOOD which are derived from forcing LISFLOOD with gridded, near real-time meteorological (proxy) observations. They include total precipitation,
Both EFAS and GloFAS require total precipitation. Data availability defines the list of the remaining meteorological forcings. Specifically, EFAS makes use of minimum and maximum temperature, average wind speed, surface solar radiation downwards, and water vapour pressure; GloFAS makes use of 2-metre temperature, 2-metre dew temperature, 10-metre U wind component, 10-metre V wind component, surface solar radiation downwards, surface thermal radiation. Reference For both EFAS and GloFAS, reference values of evapotranspiration is are derived from the meteorological forcing forcings according to the Penmann-Monteith equation, as implemented in the open-source pre-processor LISVAP.
For EFAS, these the meteorological observation maps are based from a large-number of in-situ meteorological data from various data providers, collected, quality checked and interpolated to a regular grid by CEMS MDCC before being transferred to COMPMeteorological Data Collection Centre. The observation dataset and the quality checks are presented into details in the Annual Reports of the CEMS Meteorological Data Collection Centre. The gridded dataset is therefore constantly updated, it is available for download from the European Commission Joint Research Centre Data Catalogue. More detailed information on EFAS meteorological forcing can be found in EFAS Meteorological observation maps.
For GloFAS, they the meteorological proxy observation maps are based on the Copernicus Climate Change Service atmospheric reanalysis, ERA5 and its timely component, ERA5T. The meteorological variables are upsampled using an interpolation algorithm from the open-source pre-processor pyg2p from their native resolution to 0.05 degrees resolution using bilinear interpolation from GloFAS v4, and the nearest neighbour interpolation was used for 0.1 degrees GloFAS set up (v3 and preceding versions).More detailed information on EFAS meteorological forcing can be found in EFAS Meteorological observation mapspre-processing and interpolation from native resolution to the desired resolution is described in this page.
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