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Here is a brief overview of the GloFAS data made available to the public. For a full overview of the GloFAS system, please go to the dedicated pages on the GloFAS web site http://www.globalfloods.eu/. You will find information on the latest releases here: GloFAS operational system. Note GloFAS 30-day real-time forecasts over the European domain are currently not publicly available.

GloFAS variables

GloFAS variables (called 'parameters' in ECMWF MARS) are the hydrological entities calculated by the modelling chain. For GloFAS only river
discharge is made available. A short description is given below in table 1 along metadata information associated.

Table 1. Available GloFAS variables

GLOFAS Short Description

Unit

GRIB parameter ID

GRIB Short name

GRIB Name

Comment

GRIB description

River discharge

m3/s

240024

dis24

Mean discharge in the last  24 hours

Average

Volume rate of water flow, including sediments, chemical and biological material, in the river channel averaged over a time step through a cross-section.

River discharge

GloFAS variable discharge (dis) is stored as average over the time step of the model (6-hourly or 24-hourly), with time stamp (date and time of end of averaging period) explicit in the GRIB short name.

It is hence essential that when extracting river discharge data, the user also checks the upstream area of the grid box of interest.

GloFAS upstream area

In order to interpret the GloFAS output in a correct way, you will need static data that describes the model setup. This file denotes the total upstream area for each river pixel, expressed in m2. Upstream area is defined as the catchment area for each river segment, in other words the total area that contributes with water to the river at the specific grid point. The upstream area always includes the area of the pixel. You can download the upstream area file as NetCDF file here: upArea.nc (last update 28/03/2022)

GloFAS-ERA5

Table 1: Available river discharge reanalysis simulation

Forcing

Data set

Period

Lead time

Frequency

Ensemble members

ERA5Reanalysis1 Jan 1979 - near real-time24 hDaily
-

GloFAS 30-day

Table 2: Available GloFAS 30-day river discharge simulations

Forcing

Data set

Period

Lead time

Frequency

Ensemble members

ECCMWF-ENSReal-time forecasts2 Dec 2020 - real-time30 daysDaily51
ECMWF-ENSReforecastsJan 1999 - Dec 201830 daysTwice weekly11
1 Jan 2019 - 30 Jun 201930 daysTwice weekly51
1 July 2019 - 1 Dec 202030 daysDaily51

GloFAS Seasonal

Table 3: Available GloFAS Seasonal river discharge forecasts and reforecasts

Forcing

Data set

Period

Lead time

Frequency

Ensemble members

ECMWF SEAS5 seasonal forecastReal-time forecastsDec 2020 - real-time123 daysMonthly51
ReforecastsJan 1981 - Dec 2017123 daysMonthly25
Jan 2018 - Nov 2020123 daysMonthly51



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