Study says Alaska could lose massive icefield by 2200
By SUE MITCHELL
March 26, 2016
The estimate is the product of the first detailed look at the future of the Juneau Icefield, source of the Mendenhall and about 140 other glaciers, said Regine Hock, a glaciologist at UAF’s Geophysical Institute.
The Juneau Icefield forms a snow-covered expanse in the Coast Mountains north of Juneau.
“By the end of this century, people will most likely not be able to see the Mendenhall Glacier anymore from the visitor’s center,” Hock said.
Hock is one of the authors on a paper published in the Journal of Glaciology that outlines their findings. UAF postdoctoral fellow Florian Ziemen, UAF glaciologist Andy Aschwanden, Hock and five others used past and present observations and mathematical models to predict how North America’s fifth-largest icefield would react under different climate scenarios.
The Mendenhall Towers, upper left, are prominent peaks visible from the Mendenhall Glacier visitor area near Juneau. This photo was taken from a point northeast of the peaks.
The icefield covers 1,500 square miles in steep mountainous terrain. Climate data for the area has been sparse. The researchers were able to correct the data set from the Weather Research and Forecasting Model and combine that with the Parallel Ice Sheet Model. The Parallel Ice Sheet Model, developed by UAF researchers, is widely used by glacier researchers around the world.
The team predicted that more than 60 percent of the ice will be lost by 2099 if warming trends continue, Hock said. The entire icefield could be gone by 2200.
However, if temperatures remain the same as they are today, the Juneau Icefield will retreat only slightly and then stabilize. The researchers found interesting the model results that also show that the icefield would regrow to almost its current shape if the area were ice-free right now. That’s because the high-altitude cold weather of the mountains would cause snowfall to start the glacier-forming process again, Hock said. This is very different from other glaciers and icefields in Alaska that are at lower altitudes.
Representations of fact and opinions in comments posted below are solely those of the individual posters and do not represent the opinions of Sitnews.