by Andrea Mustain
June 09, 2010
The image illustrates
the ice surface (transparent top layer with contour lines)
imaged from NASA's
ICESat satellite and below that the rugged bedrock topography
of the Gamburtsev
Subglacial Mountains mapped from airborne geophysical data
from the AGAP project
showing a surprisingly rugged mountain range
with deeply incised
valleys beneath the ice sheet.
CREDIT: Michael Studinger
The first detailed pictures of one of
the planet's last unexplored frontiers - a vast mountain range that
rivals the Alps in majesty buried underneath the ice of Antarctica -
were revealed by scientists this week.
The rugged peaks soar to more than 8,000 feet (2,400 meters). They
are buried beneath solid ice more than a mile (1.6 kilometers)
thick, deep within Antarctica's eastern interior.
existence of this mountain range, called the
Mountains, shocked the Russian scientists who first discovered it
more than 50 years ago, and mystery still shrouds the nearly
750-mile- (1,200-km-) long series of subglacial peaks.
At the International Polar Year conference in Oslo, Norway,
scientists unveiled new radar images of an area of the mountains the
size of the state of New York.
"What we'd shown before was an
estimate based on gravity data - a little bit of a coarse
resolution tool," said Robin Bell, a senior research scientist
at Columbia's Lamont-Doherty Earth Observatory in New York.
"What we showed at this meeting was
the radar data. It's like going from using a big, fat sharpie to
using a fine-tipped pencil."
What the pictures reveal, Bell
said, is spectacular: a dramatic landscape of rocky summits, deep
river valleys, and liquid, not frozen, lakes, all hidden beneath the
Bell was among a team of scientists from seven countries who spent
two frigid months collecting geophysical data in the remote
antipodean wilderness via sophisticated, aircraft-mounted
instruments in late 2008 and early 2009.
The expedition provided researchers with several terabytes of
information - just one terabyte could hold two days worth of songs
or one million pictures. Although it will take years to process
all that data, Bell hopes the numbers will answer some of the
questions surrounding the Gamburtsev Mountains.
A big one is how
they formed in the first place.
"We now know it's not a volcanic
mountain range," said study team member Kathryn Rose, of the
British Antarctic Survey.
"And uplift by a hotspot in the mantle
is probably out in terms of a mechanism of formation." (The
mantle is the scorching hot, molten rock that underlies Earth's
crust and is the source of volcanic magma.)
Rose said the data are also providing
invaluable insight into the evolution of the colossal East
Antarctica Ice Sheet - the 6 million square miles (15.5 million
square km) of ice that conceals the Gamburtsev Mountains and is
important to understand in terms of its potential to melt in a
"Scientists need to improve our
understanding of ice sheets and their dynamics because it
impacts sea level everywhere," Bell told OurAmazingPlanet,
emphasizing that new insights are guaranteed for years to come.
"We're still scratching our heads as to how the mountains were
made and why they're still there," she said. "But I think we
have the data we need to solve the puzzle."