G3P - The Global Gravity-based Groundwater Product
Groundwater is one of the most important freshwater resources for mankind and for ecosystems. Due to its fundamental role in the Earth’s water and energy cycles,
groundwater has been declared as an Essential Climate Variable (ECV) by GCOS, the Global Climate Observing System.
The Copernicus Services, however, do not yet deliver data on this fundamental resource, nor is there any other data source worldwide that operationally provides
information on changing groundwater resources in a consistent way, observation-based, and with global coverage.
This gap will be closed by G3P, the Global Gravity-based Groundwater Product, a European Union’s Horizon 2020 project.
Project webpage link
Setting-up the groundwater product as a new cross-cutting application of the existing product portfolio of three Copernicus core services, i.e., combining products
of the Global Land Monitoring Service (snow water equivalent, soil water index, river water levels), the Copernicus Climate Change Service (C3S)
(surface soil moisture, glacier mass changes, lake water level), and the Emergency Management Service (river discharge and simulated storage compartments).
G3P aims at developing a product of groundwater storage variations with global coverage and monthly resolution from 2002 until present by a cross-cutting
combination of GRACE and GRACE-FO satellite gravity data with water storage data that are based on the existing portfolio of the Copernicus services.
FMI provides first-hand information about the atmospheric, terrestrial and marine environments via space-borne observations of the Earth.
To resolve for groundwater changes, variations in the different water storage compartments have to be quantified and substracted from the total water storage.
Within G3P FMI will provide snow information required to account for its related water storage compartment.
FMI's Copernicus Global Land service (CGLS) Snow Water Equivalent is going to be enhanced as gap-filled product and global expansion of snow information is conducted.
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This project has received funding from
the European Union’s Horizon 2020 research and innovation programme
under grant agreement No 870353.