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About GTN-H

Configuration of Network

Network Partners

Global Terrestrial Networks

Hydrological Data Access


GTN-H and


IGWCO 2010 Meeting

2009 Meeting


water quality

Example of a Water quality sampling at the lake of the Twaing Meteorite Impact Crater, South Africa. Photo: Brendan Hohls


About GTN-H

Global greenhouse warming is already impacting the Arctic regions of the world to a greater extent than in temperate and tropical regions. Changes in snow accumulation and melting, a reduction in the extent of sea ice and increases in freshwater fluxes to the Arctic Ocean have already been observed. Freshwater inputs exert a surprisingly large impact on the water circulation of the Arctic Ocean and on the global ocean circulation as well.

Download GTN-H Flyer as .pdf file here.

Goals of GTN-H

Main Objectives

The main objective of the GTN-H is to make available data from existing global hydrological observation networks and to enhance their value through integration. GTN-H thus underpins the generation of datasets suitable for:

  1. Research in the areas of global and regional climate change
  2. Environmental Monitoring
  3. Hydrology and water resource management

International Context

The GTN-H is a joint effort of the World Meteorological Organization / Climate and Water Department (WMO/CLW), the Global Climate Observing System (GCOS), co-sponsored by WMO, UNEP, IOC and ICSU, and the Global Terrestrial Observing System (GTOS), co-sponsored by WMO, UNESCO, ICSU, UNEP and FAO.

GTN-H represents the observational arm of the Group on Earth Observations / Integrated Global Water Cycle Observations Theme (GEO/IGWCO).

Selected Achievements