Scientists Head to Warming Alaska on Ice Core Expedition
By David Sims, Institute for the Study of Earth, Oceans, and Space
May 7, 2008
The Saint Elias Mountains from the window of a Twin Otter aircraft en route to an ice core drill site in May 2002. Scientists have been gathering a series of ice cores from around the Arctic to better understand the regional climate-change picture. Cameron Wake photo.
The state of Alaska has the dubious distinction of leading the lower 48 in
the effects of a warming climate. Small villages are slipping into the sea
due to coastal erosion, soggy permafrost is cracking buildings and trapping
trucks.
In an effort to better understand how the Pacific Northwest fits into the
larger climate-change picture, scientists from UNH and the University of Maine
are heading to Denali National Park on the second leg of a multi-year mission
to recover ice cores from glaciers in the Alaska wilderness.
Cameron Wake of the UNH Institute for the Study of Earth, Oceans, and Space
(EOS) and Karl Kreutz of the University of Maine Climate Change Institute are
leading the expedition, which is funded by the National Science Foundation.
This year’s month-long reconnaissance mission will identify specific
drill sites for surface-to-bedrock ice cores that will provide researchers
with the best climate records going back some 2,000 years. The fieldwork is
part of a decade-long goal to gather climate records from ice cores from around
the entire Arctic region.
“Just as any one meteorological station can’t tell you about regional
or hemispheric climate change, a series of ice cores is needed to understand
the regional climate variability in the Arctic,” says Wake, research
associate professor. “This effort is part of a broader strategy that
will give us a fuller picture.”
Kreutz says the 2,000-year ice core record will provide a good window for
determining how the climate system has been affected by volcanic activity,
the variability of solar energy, changes in greenhouse gas concentrations and
the dust and aerosols in the atmosphere that affect how much sunlight reaches
the Earth.
“This is a joint effort in the truest sense,” says Kreutz, who
has collaborated with Wake in both Arctic and Asian research for the better
part of a decade. Kreutz’s UMaine team will consist of Erich Osterberg,
who received his Ph.D. in December, second-year M.S. candidate Ben Gross, and
Seth Campbell, an undergraduate majoring in Earth science.
Wake conducted an initial aerial survey of the Denali terrain two years ago
but notes there have been “no boots on the ground.” Through May,
Wake, his Ph.D. student Eric Kelsey, the UMaine team, and Canadian ice-core
driller Mike Waszkiewicz will visit potential deep drilling sites and use a
portable, ground-penetrating radar to determine the ice thickness and internal
structure on specific glaciers. They will be looking for “layer-cake” ice
with clear, well-defined annual stratigraphy.
A clear record from Denali will help round out the bigger paleoclimate picture
by adding critical information gathered from ice cores recovered in the North
Pacific, all of which can be compared to a wealth of climate data already gathered
in the North Atlantic region.
According to Wake, scientists have long thought the North Atlantic drives
global climate changes. However, there are now indications that a change in
the North Pacific might happen first and be followed by a North Atlantic response. “We
need to better understand the relationship in terms of the timing and magnitude
of climate change between these two regions,” he says.
At the potential drill sites, the scientists will also collect samples for
chemical analysis from 20-foot-deep snowpits and shallow ice cores, and install
automatic weather stations at 7,800 feet and 14,000 feet. The chemical analyses,
which will be carried out at both UNH and UMaine labs, are needed to decipher
changes in temperature, atmospheric circulation, and environmental change such
as the phenomenon known as “Arctic haze,” which has brought heavily
polluted air masses to the region for decades from North America, Europe, and
Asia.
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