Critical polar data flows briskly to researchers

Sep 01, 2010
On Oct. 31, 2009, researchers with NASA's Operation IceBridge mission used the Airborne Topographic Mapper instrument to compile data for this elevation map of Antarctica's Crane Glacier. Similar data has been archived, available to researchers, at the National Snow and Ice Data Center at the University of Colorado at Boulder. Credit: Kyle Krabill and the NASA ATM team

Operation IceBridge -- a NASA airborne mission to observe changes in Earth's rapidly changing polar land ice and sea ice -- is soon to embark on its fourth field season in October. The mission is now paralleled by a campaign to bring data to researchers as quickly as possible and to accelerate the analysis of those changes and how they may affect people and climate systems.

"Anyone can access the wealth of IceBridge data online, and do so free of charge and without a formal request," said Michael Studinger, IceBridge project scientist at NASA's Goddard Space Flight Center in Greenbelt, Md. "It's critical for data to be free and accessible so scientists can conduct timely studies of ice dynamics and a ."

In 2009, mission scientists and crew flew 41 flights and collected data over about 143,000 miles - equivalent to 5.7 trips around the Earth. NASA and its designated archive for IceBridge data, the National Snow and Ice Data Center (NSIDC) at the University of Colorado at Boulder, have teamed to move that data from the aircraft and instruments to researchers' computers.

In the Arctic, they used laser altimeters to collect surface elevation information for ice sheets and previously observed by NASA's Ice, Cloud, and Land Elevation Satellite (ICESat). Radar turned up measurements of snow depth on sea ice during a cross-Arctic flight.

In the Antarctic, researchers made a detailed survey of the Pine Island, Thwaites, Smith, Kohler and Crane glaciers, while another instrument peeked at the detailed topography under Pine Island's tongue. They collected the first airborne data for sea ice in the Weddell and Bellingshausen Seas.

To date, NSIDC has published 12 datasets from the IceBridge Greenland and Antarctica campaigns in 2009. These datasets spanned 10 instruments, including lidars, radars, sounders, gravimeters, mappers, and cameras, as well as atmospheric measurements and aircraft positioning data.

"It's exciting to have such a diversity of data, preserving it for the future and making it available in ways that will encourage new discoveries," said Marilyn Kaminski, NSIDC's project manager for IceBridge. "There's so much potential that can be tapped."

NASA flew its 2010 IceBridge Greenland campaign from March through May; data will be available at NSIDC in Fall 2010. NSIDC will publish data from subsequent campaigns within six to eight weeks of receipt from the data providers. This rapid turnaround will enable researchers to use these important data to monitor receding glaciers, the melting Greenland ice sheet, crumbling ice shelves on the Antarctic Peninsula, and the thinning of old, thick Arctic sea ice that has been the mainstay of the sea ice cover.

Data from campaigns flown prior to the inception of IceBridge will also be archived at NSIDC. These include data from the Airborne Topographic Mapper (ATM) instrument; mountain glacier data from the University of Alaska Fairbanks; and deep radar bedmap data from University of Kansas radar instruments. Combined with NSIDC's existing complete archive of data from the Geoscience Laser Altimeter System (GLAS) instrument aboard ICESat, researchers will be able to access a rich repository of complementary measurements.

IceBridge, a six-year NASA mission, is the largest airborne survey of Earth's polar ice ever flown. It will yield an unprecedented three-dimensional view of Arctic and Antarctic ice sheets, ice shelves and sea ice. These flights will provide a yearly, multi-instrument look at the behavior of the rapidly changing features of the Greenland and Antarctic ice.

Data collected during IceBridge will help scientists bridge the gap in polar observations between NASA's ICESat -- in orbit since 2003 -- and ICESat-2, planned for late 2015. ICESat stopped collecting science data in 2009, making IceBridge critical for ensuring a continuous series of observations.

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