Ancient ice sheet may have melted later than previously thought

After one of the snowiest winters in recent memory, William Philipps will forego the beach to spend the summer studying glaciers at the world’s northernmost university.

The UB geology graduate student and self-proclaimed “nerd who likes rocks” will travel to the University Centre on Svalbard (UNIS) in Norway to collect data that proves the Svalbard-Barents Sea Ice-Sheet’s (SBSIS) time of deglaciation — the point when the ice began to melt — is older than its suggested age of 12,000 years.

Philipps will travel to Svalbard on July 12 through UNIS’s Icebound Project, which seeks to improve understanding of the region for petroleum exploration. He will spend three months completing a mix of courses and research on global climate change.

The Norwegian archipelago of Svalbard is not the average study abroad or research experience. Philipps will visit during the region’s midnight sun season, a period when the sun is visible 24 hours a day. He also will undergo survival training that includes strapping on an insulated suit and learning to withstand the chilly artic water.

Fortunately, Philipps is familiar with the experience. A member of the paleoclimatology research group working under Jason Briner, associate professor in the Department of Geology, UB College of Arts and Sciences, he conducted similar research in Greenland as an undergraduate.

“I am incredibly fortunate to be where I am in life,” says Philipps. “I get to work in the most breathtaking settings in the world on complex scientific problems and learn from some of the foremost research scientists in my field.”

At their maximum extent, as long as 25,000 years ago, SBSIS and other ice sheets — some more than a mile thick — engulfed the northern hemisphere. But over time, the ice eroded, transporting pieces of rock, known as glacial erratics, up to hundreds of miles into different geologic areas.

Once the ice melted, the rocks were exposed to the sun and bombarded with cosmic radiation, causing a nuclear chemical reaction that produces beryllium. Through cosmogenic exposure dating, researchers measure the ratios of beryllium to determine the time of deglaciation.

The material used to date SBSIS’s deglaciation were pieces of driftwood found on Kongsøya and Hopen, two of Svalbard’s easternmost islands. However, the conditions for the wood to be deposited on the islands indicate that the time between the ice beginning to drift and when the wood was deposited may be thousands of years off, says Philipps.

After collecting from several locations samples that are fractions of a gram in weight and about the size of a pinhead, the researchers will send the erratics to a mass spectrometer facility to measure their age.

The study’s results will increase the understanding of SBSIS’s behavior and can .potentially help predict the future behavior of the West Antarctic Ice Sheet.

Determining the age of the erratics also will improve constraints of glacial isostatic adjustment (GIA) values for the region, which detail the rise of landmasses that were suppressed by the weight of ice sheets during a glacial period, says Philipps.

The Icebound Project is funded by the ConocoPhillips and Lundin Petroleum arctic research program.