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The Global Gravity-based Groundwater Product (G3P): first results

Authors
/persons/resource/esharifi

Sharifi,  Ehsan
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/guentner

Güntner,  A.
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/jhaas

Haas,  Julian
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Dorigo,  Wouter
External Organizations;

Jäggi,  Adrian
External Organizations;

Ruz Vargas,  Claudia
External Organizations;

Behzadpour,  Saniya
External Organizations;

/persons/resource/boergens

Boergens,  Eva
1.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Briese,  Christian
External Organizations;

Lopez,  Sergio Contreras
External Organizations;

Crétaux,  Jean Francois
External Organizations;

Darbeheshti,  Neda
External Organizations;

/persons/resource/dobslaw

Dobslaw,  H.
1.3 Earth System Modelling, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Dussaillant,  Inés
External Organizations;

/persons/resource/flechtne

Flechtner,  Frank
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Hunink,  Johannes
External Organizations;

Kidd,  Richard
External Organizations;

Kosmale,  Miriam
External Organizations;

Kukuric,  Neno
External Organizations;

Kvas,  Andreas
External Organizations;

Luojus,  Kari
External Organizations;

Mayer-Gürr,  Torsten
External Organizations;

Meyer,  Ulrich
External Organizations;

Pasik,  Adam
External Organizations;

Paul,  Frank
External Organizations;

Pedinotti,  Vanessa
External Organizations;

Vayre,  Maxime
External Organizations;

Zawadzki,  Lionel
External Organizations;

Zemp,  Michael
External Organizations;

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Citation

Sharifi, E., Güntner, A., Haas, J., Dorigo, W., Jäggi, A., Ruz Vargas, C., Behzadpour, S., Boergens, E., Briese, C., Lopez, S. C., Crétaux, J. F., Darbeheshti, N., Dobslaw, H., Dussaillant, I., Flechtner, F., Hunink, J., Kidd, R., Kosmale, M., Kukuric, N., Kvas, A., Luojus, K., Mayer-Gürr, T., Meyer, U., Pasik, A., Paul, F., Pedinotti, V., Vayre, M., Zawadzki, L., Zemp, M. (2022): The Global Gravity-based Groundwater Product (G3P): first results - Abstracts, EGU General Assembly 2022 (Vienna, Austria & Online 2022).
https://doi.org/10.5194/egusphere-egu22-1659


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5012112
Abstract
The Global Gravity-based Groundwater Product (G3P) aims at developing a satellite-based groundwater storage (GW) data set as a new product for the EU Copernicus Climate Change Service. As the world’s largest distributed freshwater storage, GW is a key resource for mankind, industrial, and agricultural demands. In Copernicus, there is no service available yet to 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. Therefore, G3P develops an operational global groundwater service as a cross-cutting extension of the existing Copernicus portfolio. G3P capitalizes from the unique capability of GRACE and GRACE-FO satellite gravimetry as the only remote sensing technology to monitor subsurface mass variations, and from other satellite-based water storage products to provide a data set of groundwater storage change for large areas with global coverage. G3P is obtained by using a mass balance approach, i.e., by subtracting satellite-based water storage compartments (WSCs) such as snow water equivalent, root-zone soil moisture, glacier mass, and surface water storage from GRACE/GRACE-FO monthly terrestrial water storage anomalies (TWSA). For a consistent subtraction of all individual WSCs from GRACE-TWSA, the individual WSCs are filtered in a similar way as GRACE-TWSA, where optimal filter types were derived by analyses of spatial correlation patterns. G3P groundwater variations are provided for almost two decades (from 2002 to the present), with the monthly resolution, and at a 0.5-degree spatial resolution globally. In this contribution, we also illustrate preliminary results of the G3P data set and of its uncertainties, as well as its evaluation by independent groundwater data. This study has received funding from the European Union’s Horizon 2020 research and innovation programme for G3P (Global Gravity-based Groundwater Product) under grant agreement nº 870353.