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Global Networks of Isotopes in Precipitation and Rivers (GNIP, GNIR)

​The Global Network of Isotopes in Precipitation (GNIP) is a worldwide observation network of hydrogen and oxygen isotopes in precipitation, initiated in 1960 by the International Atomic Energy Agency (IAEA) and the World Meteorological Organization (WMO), and operated in cooperation with numerous partner institutions in member states.

The analysis of the temporal and spatial variations of environmental isotopes in precipitation (mainly oxygen-18 and deuterium) provides basic data for the use of isotopes in hydrological investigations within the scope of water resources inventory, planning and development.  To complement the GNIP, a Global Network of Isotopes in Rivers (GNIR) was initiated in 2002. GNIR is a global environmental observation programme dedicated to the compilation of isotopic assays of river waters, but also to the ongoing collection and analysis of water samples.

Both resources are available through the WISER portal (Water Isotope System for Data Analysis, Visualization and Electronic Retrieval).

Resource Information

Quality Level Quality-checked: Data quality is checked regularly by staff of NAPC/Isotope Hydrology Section
Completeness Selective: The databases include data from the GNIP and GNIR networks and also published datasets.
Update Frequency Updated periodically: Updates to the databases are made several times per year.
Last Resource Update 2015-05-01
Subject Hydrology; Water
Organizational Source Nuclear Applications
Data Type Numerical data
Keywords Water; Hydrology; Deuterium; Oxygen Isotopes; Tritium; Precipitation
Contact Point WISER.Contact-Point@iaea.org
Page Authors
ARAGUÁS ARAGUÁS, Luis J.
TERZER-WASSMUTH, Stefan