WASHINGTON, D.C. – NASA launched its sixth consecutive year of Antarctica overflights to study changes that could be a significant harbinger of climate change due to global warming. The science craft measures the ice sheet over all, the glaciers and the surrounding sea ice for changes that could provide scientists with the latest up-to-date information on the overriding global problem, even according to the CIA.
This year’s airborne campaign, which began its first flight Thursday morning, will revisit a section of the Antarctic ice sheet that recently was found to be in irreversible decline, according to Thursday’s announcement.
“We are curious to see how much these glaciers have changed in two years,” said Eric Rignot, IceBridge science team co-lead and glaciologist at the University of California, Irvine and NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California.
For the next several weeks, researchers will fly aboard NASA’s DC-8 research aircraft out of Punta Arenas, Chile. This year also marks the return to western Antarctica following 2013’s campaign based at the National Science Foundation’s McMurdo Station.
IceBridge will use a suite of instruments that includes a laser altimeter, radar instruments, cameras and a gravimeter, an instrument that detects small changes in gravity. These small changes reveal how much mass these glaciers have lost.
Repeated annual measurements of key glaciers maintains a long-term record of change in the Antarctic that goes back to NASA’s Ice, Cloud and Land Elevation Satellite (ICESat) which stopped collecting data in 2009. IceBridge researchers plan to measure previously unsurveyed regions of Antarctica, including the upper portions of Smith Glacier in West Antarctica, an area known to be thinning faster than any other glaciers in the region.
The mission also plans to collect data in portions of the Antarctic Peninsula, such as the Larsen C, George VI and Wilkins ice shelves, and the glaciers that drain into them. The Antarctic Peninsula has been warming faster than the rest of the continent.
“The Antarctic Peninsula is changing fairly rapidly and we need to be there to capture that change,” said Michael Studinger, IceBridge project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
The mission also will collect data on Antarctic sea ice, which recently reached a record high coverage. This contrasts with declining sea ice in the Arctic and is due do a variety of factors such as changing wind patterns.
Antarctic sea ice coverage is slightly above average according to recent data and the growth varies from one part of Antarctica to another. Ice cover in the Bellingshausen Sea has been decreasing, for instance, while ice in the nearby Ross Sea is growing.
“There are very strong regional variations on how sea ice is changing,” said Nathan Kurtz, a sea ice scientist at Goddard.
These regional trends together yield a small increase, so studying each region will help scientists get a better grasp on the processes affecting sea ice over a wider area.
In addition to extending ICESat’s data record over land and sea ice, IceBridge will also help set the stage for ICESat-2 by measuring ice the satellite will fly over.
One of IceBridge’s highest priority surveys is a circular flight the DC-8 will fly around the South Pole at 88 degrees south latitude. This latitude line is where all of ICESat-2’s orbits will converge in the Southern Hemisphere.
Measuring ice elevation at these locations will help researchers build a time series of data that spans more than a decade and provide a way to help verify ICESat-2’s data.
IceBridge’s Antarctic field campaign will run through late November.
See more about Operation IceBridge here.
© 2014, Glynn Wilson. All rights reserved.