Scientists explore ice caps

Courtesy of Dr. Eric Kendrick The landing gear was sheared off the fixed-wing ski-equipped aircraft and it was damaged at Mount Patterson, West Antarctica. Although the plane crashed, no one was injured.

Like most scientists heading up large projects, earth sciences professor Terry Wilson has her share of problems: looking after her scientists, writing grant proposals, making sure research is done on time.

Unlike most researchers, she has to concern herself with the physical survival of her team, which is racing against months of unrelenting darkness to install sites that will monitor the West Antarctic Ice Sheet in a study that could prove integral to the understanding of the melting ice caps.

So far the team has coped with everything from freezing temperatures to heavy gear and time constraints.

And then there was the plane crash.

"Everyone wants to talk about the plane crash," Wilson said, her voice barely concealing a note of exasperation. "I think the science is much more interesting."

International inquiry The science begins with the first International Polar Year, a mass of expeditions conducted in 1882-1883 on two basic principles: that the poles could provide answers to some of the biggest questions in earth science and that the study of these poles is a massive undertaking that requires cooperation between nations and disciplines.

"The poles are like a canary in a coal mine," Wilson said. "They're a pretty accurate signal of what one can expect to happen with the rest of the world."

The fourth IPY, organized 125 years later by the International Council for Science, involves 60 nations and helps to provide funding for more than 200 projects.

Courtesy of TAMDEF Team Terry Wilson places a GPS antenna at C-GPS site in Westhaven Nunatak Antarctica.

Wilson's project, considered a "core project" by the IPY, is called POLENET, or The Polar Earth Observing Network. POLENET is an international consortium that will be planting GPS stations, much like the ones in cars and handheld devices, and seismologic sensors along the West Antarctic Ice Sheet. Four researchers from Ohio State are currently deployed in Antarctica as part of this season's 13-person installation team.

"Nobody doubts the ice (at the poles) is melting," said Wilson, "but the rate of change - how fast the ice is melting - is a hot topic of debate. Nobody knows if it will be in hundreds or thousands of years. By supplying two pieces to the puzzle, we can model exactly how much ice is lost."

Any land, including Ohio, that was covered with ice in the past has been squished under the weight of immense glaciers. When the weight is removed, the land starts to pop up - think of what happens if one presses a thumb against a foam stress ball, then removes it. The GPS stations being planted by POLENET will measure the rate of this rebounding, and the seismologic sensors - the same kind that helped scientists learn that the earth has a solid inner core and a liquid outer core - will provide clues about the mechanical properties of the earth.

GPS has been used for this kind of scientific research in Antarctica since 1995, when the technology became accurate enough to measure very small motions. Although most people use their GPS to get directions, they can deal with the instrument being inaccurate by a few feet. POLENET uses five times more satellites than are used by the average consumer to get an extremely accurate reading of the position of the land surface, which is moving by half an inch a year or less.

A rough start While most of OSU was on winter break, POLENET researchers climbed aboard a hulking C-17 military aircraft headed to McMurdo Station, the largest community in Antarctica. "They are all military planes. No commercial flights to Antarctica!" said Stephanie Konfal, a graduate student in geological sciences, in her blog chronicling the expedition.

Courtesy of TAMDEF Team The TAMDEF Team builds a continuously-recording GPS station at Fishtail Point, Skelton Glacier, Antarctica.

Soon they used an old ski-equipped DC-3 to help them reach destinations far from the safety of the base, braving winds and temperatures that would hit 32 degrees Fahrenheit on the best of days. The installations were going well, despite bouts of inclement weather, when a failed takeoff destroyed the plane. Wilson explains the crash: "The snow in Antarctica is hard and flat, but not even. Just like in the desert, you get rough ground and snow dunes. The plane was trying to get some speed, bounced on a couple dunes, and just as it was about to get into the air a dune caught it the wrong way. The plane crashed sideways and the skis were ripped off."

No one was hurt in the accident, and team members on board - including OSU senior research associate Eric Kendrick - used their iridium satellite phones to call for help. They were stuck in the remote area for more than 17 hours, relying on their survival packs to shelter them from the cold.