by Staff Writers
Utrecht, Netherlands (SPX) Apr 04, 2017
Measuring almost 100,000 km2 (about twice the size of the Netherlands), the ice caps around Greenland's edges represent the largest glacierised area on earth, outside of the large ice sheets of Greenland and Antarctica. On a healthy ice cap, tens of metres of tightly packed snow are able to absorb meltwater in summer. In winter, that water refreezes, causing the total mass to remain more or less stable from year to year. However, increasing temperatures have knocked that yearly cycle out of balance.
The amount of meltwater is so great that the tightly packed snow is now completely saturated with refrozen meltwater. That means that new meltwater cannot be absorbed by the snow anymore, causing it to run off into the sea. To get a good idea of the status of Greenland's ice caps - the smaller masses of ice around the edges of the island - the researchers focused on 12 areas around the island.
The data show that the ice caps in each of those 12 areas have been losing mass since 1997, with increases in meltwater run-off varying from 17% in the south to 74% in the northernmost area. Currently, Greenland's ice caps are losing about three times as much mass per year as they were before 1997.
Noel's research is focused on the ice caps around the edge of the island. "The main ice sheet in the interior of Greenland is much more elevated and isn't doing too bad yet," says Noel. "But we can already see an increase in the altitude of the 'melting line' there as well."
More detailed model
"This gives us confidence that the model is reliably reproducing the ongoing changes." With the model, Noel analysed a number of variables that influence ice mass in enough detail to show not only the ice caps' mass loss, but also the underlying causalities. After increasing the resolution from 11 km to 1 km, the researchers saw that the mass loss correlates directly with meltwater run-off, which is in turn directly influenced by an increase in temperature.
One fifth to one quarter
Chicago (AFP) March 25, 2017
For the last decade, American photographer James Balog has been on a mission to document climate change through his camera lens. His effort has taken him to the farthest reaches of the world, from Antarctica to the northern ends of Greenland, where he has captured the movements and melts of immense glaciers. The results of his work were on display at Chicago's Museum of Science and Indus ... read more
Beyond the Ice Age
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