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GRDC Freshwater Fluxes into the World's Oceans 2020 published

The GRDC Freshwater Fluxes into the World’s Oceans is a new web application provided by the Global Runoff Data Centre (GRDC) to present the Freshwater Fluxes into the World’s Oceans data product.

Continental freshwater input to the oceans is computed by the GRDC at irregular intervals, most recently in December 2020 referencing the time period 1901–2016. Previous data sets prepared in 2004, 2009 and 2014 are integrated into the service. The 2004, 2009 and 2014 data sets were not re-calculated and freshwater flux estimates are given as calculated at that time.

Map layers present the freshwater fluxes by continent, by ocean or for specific land areas, for example those associated with the UNEP GIWA Regions (UNEP 2006). Freshwater fluxes per 5° and 10° latitude bands and through 5° coastline cells show how much freshwater flows from a specific land area into a specific ocean through a particular stretch of coast.

Tabular summaries present the continental fluxes into 5° or 10° latitude bands within predefined reference periods. The design of tables consistently follows a template according to Baumgartner and Reichel (1975) to assure comparability with previous calculations and across variable reference periods.

Estimations of continental runoff or freshwater input to oceans made by other authors are listed for comparison as documented in literature.

This service is published as an interactive web application ( by the German Federal Institute of Hydrology (BfG). Disclaimer, Terms and Conditions of the BfG apply.

For details about input data, computational setting and processing workflow, please read the report Freshwater Fluxes into the World’s Oceans (published in number 36 in the information series of the Federal Institute for Hydrology (BfG Mitteilungen).

Please cite in your publication the GRDC as the source of the data: Global Freshwater Fluxes into the World’s Oceans. Online provided by Global Runoff Data Centre. Koblenz: Federal Institute of Hydrology (BfG). URL, date of retrieval.

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