When the ice sheet in Greenland melts, as it has done increasingly in recent years, the bedrock beneath moves slightly.
She has led the work on the new innovative method, which has just been published in an article in the scientific journalGreenland is losing about 5 cubic kilometre of ice per week on average, based on data from the last 20 years. This is equivalent to draining Denmark's largest lake, Arresø, 40 times a week.
GNSS stands for the Global Navigation Satellite System, and it includes the American GPS system and the European Galileo. With GNSS technology, movements in the bedrock over time can be detected with sub-millimetre precision. Direct changes in ice elevation measured by altimetry satellites; and measurement of ice movements via satellite and thus how much ice streams change over time. The faster the ice moves into the ocean, the more ice is lost from the ice sheet.