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Global Freshwater Fluxes into the World Oceans (GRDC, 2014)

The GRDC re-calculated in 2014 the Global Freshwater Fluxes into the World Oceans based on results from the global hydrological model WaterGAP (Doell et al., 2003) for 0.5° grid cell resolution. The annual and long-term means of freshwater fluxes calculated for land areas associated with the UNEP GIWA Regions (UNEP, 2014) are displayed and as well freshwater fluxes from the 5° cells along the continent's coastlines. Freshwater fluxes calculated per 5° and 10° latitude bands show how much freshwater flows from a specific area into a specific ocean.

The annual freshwater inputs to the oceans within 5° and 10° latitudinal zones summarizing the individual flux values of the relevant 0.5° coastline cells are aggregated per decades and the reporting periods 1961-90 and 1971-00. For the reason of comparison with previous studies, these tables follow a design developed by Baumgartner et al. (1975).

The Global Freshwater Fluxes into the World Oceans are provided as a stand-alone Web Service. The edition of July 2014 replaces the calculation from 2009. Previous estimates and estimates documented in literature are listed for comparison.

The applied geoprocessing workflow was compiled for the GRDC into a specially designed ArcGIS toolbox by UDATA - Umweltschutz und Datenanalyse Neustadt / Weinstraße, Germany (Wilkinson et al., 2014). This workflow will be used to regularly re-calculate the freshwater fluxes, at least when the WaterGAP inputs are updated by the team at the University Frankfurt, Germany. GRDC Report 44 describes input data and methodical steps.

Please cite in your publication the GRDC as the source of the data: GRDC (2014): Global Freshwater Fluxes into the World Oceans / Online provided by Global Runoff Data Centre. 2014 ed. Koblenz: Federal Institute of Hydrology (BfG), 2014.

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