Two Greenland glaciers lose enough ice to fill Lake Erie

Ohio State University Research News reports on a better way of measuring iceloss in the Arctic: A new study aimed at refining the way scientists measure ice loss in Greenland is providing a “high-definition picture” of climate-caused changes on the island. And the picture isn’t pretty.

In the last decade, two of the largest three glaciers draining that frozen landscape have lost enough ice that, if melted, could have filled Lake Erie. The three glaciers – Helheim, Kangerdlugssuaq and Jakobshavn Isbrae – are responsible for as much as one-fifth of the ice flowing out from Greenland into the ocean.

“Jakobshavn alone drains somewhere between 15 and 20 percent of all the ice flowing outward from inland to the sea,” explained Ian Howat, an assistant professor of earth sciences at Ohio State University. His study appears in the current issue of the journal Geophysical Research Letters. As the second largest holder of ice on the planet, and the site of hundreds of glaciers, Greenland is a natural laboratory for studying how climate change has affected these ice fields.

Researchers focus on the “mass balance” of glaciers, the rate of new ice being formed as snow falls versus the flow of ice out into the sea. The new study suggests that, in the last decade, Jakobshavn Isbrae has lost enough ice to equal 11 years’ worth of normal snow accumulation, approximately 300 gigatons (300 billion tons) of ice.

“Kangerdlugssuaq would have to stop flowing and accumulate snowfall for seven years to regain the ice it has lost,” said Howat, also a member of the Byrd Polar Research Center at Ohio State. Surprisingly, the researchers found that the third glacier, Helheim, had actually gained a small amount of mass over the same period. It gained approximately one-fifteenth of what Jakobshavn had lost, Howat said.

The real value of the research, however, is the confirmation that the new techniques Howat and his colleagues developed will provide scientists a more accurate idea of exactly how much ice is being lost….

In Greenland, the Gothab glacial ice flow in 2004, shot by Susan M. Ottalini, Wikimedia Commons, under the Creative Commons Attribution-Share Alike 3.0 Unported license