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GNET site UTMG. Photo from T. Nylen.

GNET is a network of continuous GNSS stations spread across Greenland. This network will map the steady vertical velocity field associated with postglacial rebound and improve our understanding of ice mass changes in Greenland, allowing scientists to quickly detect and analyze any abrupt changes in the rate of ice loss in this region.

An internationally collaborative research campaign, the International Polar Year (IPY) 2007-2008, initiated a coordinated effort to study the polar regions using modern observational techniques, including a major investigation using geodetic and seismic instrumentation. This effort is formally known and funded under the name “POLENET”, or the Polar Earth Observing Network. In Greenland, the GNET project was developed to establish a network of GNSS receivers operating continuously and autonomously on stable bedrock around Greenland. The most prominent institutions involved in supporting this initial IPY effort were The Ohio State University, the University of Luxembourg, UNAVCO (Boulder, CO) and the National Space Institute (DTU Space, Copenhagen).

GNET is currently maintained by the Danish Agency for Data Supply and Efficiency (SDFE). SDFE has created a GNET governance structure governance structure that includes: 1) a Steering Committee; 2) an Advisory Board; and 3) an Operational Team.

The Steering Committee will discuss strategic initiatives related to the needs from stakeholders (i.e. scientific communities, public authorities and other relevant users) and find the best solutions for further maintenance and development of GNET. It will discuss major technical issues such as changes in the GNET equipment and addition of new stations in relation to the maintenance of the basic geodetic infrastructure. Furthermore, it will discuss major issues concerning data access and a GNET web site.

The Advisory Board will handle stakeholder interests and coordinate these interests to achieve the most appropriate development of GNET. The Advisory Board will promote GNET, participate in GNET conferences/workshops/meetings and arrange conferences/workshop/meetings when necessary, for both scientific communities and public authorities. The Board will gather input and feedback from the stakeholders, compile it and present the Board’s recommendations to the Steering Committee.

The Operation Team will prepare and carry out the annual field work concerning maintenance of GNET stations. It will handle data flow and data display (raw and processed data) on publicly available servers. Furthermore, it will establish and maintain a GNET web site with information to the users about GNET activities and access to data. The Operation Team will handle feedback from users concerning the web site and data accessibility and bring problems and/or new ideas to the Steering Committee.