Photo: Shfaqat Abbas Khan

GNET GPS Stations

DTU operates an array of GPS stations located along the Greenland ice sheet. The stations constitute Greenland GPS Network (GNET) and monitor the changes in the ice sheet mass.

For several years, aircraft and satellite measurements have been used to study the melting of the Greenland ice sheet.

The establishment of Greenland GPS Network (GNET) makes it possible to use measurements from more than 60 GPS stations located along the ice sheet edge to measure the changes in the crust of the Earth and thereby help us understand how climate change is affecting the ice mass in Greenland.

GNET monitors the changes in the Earth’s crust

There is a natural variation in the earth's crust height that follows the seasons. In winter, the Earth's crust is pushed closer together, because the ice sheet's mass is greater than in summer.

The data from the GNET stations makes it possible to follow the variations in the Earth's crust over a period of several years, because the stations remain in the same place. This makes it possible to determine whether there is a permanent melting of the ice.

GNET is a well-suited tool to make local measurements, while aerial and satellite images provide a more coherent overview of a larger area. Therefore, it is optimal to combine the different methods when figuring out how much and even where Greenland is losing weight. 

GNET is operated in collaboration with the National Science Foundation and Ohio State University.