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News Release 98-006

Newly Declassified Submarine Data Will Help Study of Arctic Ice

Map of Gore Box

Map of Arctic Ocean where formerly classified submarine data are now being released for study.

January 28, 1998

This material is available primarily for archival purposes. Telephone numbers or other contact information may be out of date; please see current contact information at media contacts.

A treasure-trove of formerly classified data on the thickness of sea ice in the Arctic Ocean, gathered by U.S. Navy submarines over several decades, is now being opened. Data from the first of approximately 20 cruise tracks -- an April, 1992 trans-Arctic Ocean track -- has just been released, and information from the rest of these tracks, or maps of a submarine's route, will be analyzed and released over the next year-and-a-half.

"The data opens up a magnificent resource for global change studies," said Mike Ledbetter, National Science Foundation (NSF) program director for Arctic system science.

Climate modellers differ over the fate of the great expanse of Arctic sea ice, which is about the size of the United States. More than half the ice melts and refreezes each year.

"The Navy has collected data for decades on ice thickness in the Arctic, which was important to know for navigation and defense," said Ledbetter. "But this information is also extremely important to science, now giving us a history of sea ice that we could not collect any other way."

"The data is essential to building a baseline of sea-ice thickness in the Arctic basin to examine how global change affects ice cover," explained Walter Tucker of the U.S. Army Cold Regions Research and Engineering Laboratory. Tucker is supported by NSF to process and analyze all digital ice-draft data collected by Navy submarines in the Arctic since 1986. The National Snow and Ice Data Center at the University of Colorado-Boulder is handling the actual data release.

The Arctic Submarine Laboratory, on behalf of the Chief of Naval Operations, approved declassifying the sea-ice data within a specific swath of the Arctic Ocean, roughly between Alaska and the North Pole. The area is known as the "Gore Box" for Vice President Al Gore's initiative to declassify Arctic military data for scientific use.

The data will provide a historical context for current, more intensive studies of Arctic ice by the Surface Heat Budget of the Arctic Ocean (SHEBA) project, in which NSF has frozen a ship into the ice to serve as a floating science platform for 13 months. SHEBA's aim is to chart the fate of the pack ice, ultimately improving predictions of global change.


Media Contacts
Lynn T. Simarski, NSF, (703) 292-8070, email:

Program Contacts
Mike Ledbetter, NSF, (703) 292-8029, email:

The U.S. National Science Foundation propels the nation forward by advancing fundamental research in all fields of science and engineering. NSF supports research and people by providing facilities, instruments and funding to support their ingenuity and sustain the U.S. as a global leader in research and innovation. With a fiscal year 2023 budget of $9.5 billion, NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and institutions. Each year, NSF receives more than 40,000 competitive proposals and makes about 11,000 new awards. Those awards include support for cooperative research with industry, Arctic and Antarctic research and operations, and U.S. participation in international scientific efforts.

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