by Staff Writers
Irvine CA (SPX) Aug 23, 2011
A vast network of previously unmapped glaciers on the move from thousands of miles inland to the Antarctic coast has been charted for the first time by UC Irvine scientists. The findings will be critical to tracking future sea rise from climate change.
"This is like seeing a map of all the oceans' currents for the first time. It's a game changer for glaciology," said UCI earth system science professor Eric Rignot, lead author of a paper on the ice flow published online in Science Express. "We're seeing amazing flows from the heart of the continent that had never been described before."
Rignot, who is also with NASA's Jet Propulsion Laboratory, and UCI associate project scientists Jeremie Mouginot and Bernd Scheuchl used billions of points of data captured by European, Japanese and Canadian satellites to weed out cloud cover, solar glare and land features.
With the aid of NASA technology, they painstakingly pieced together the shape and velocity of glacial formations, including the huge bulk of previously uncharted East Antarctica, which comprises 77 percent of the continent.
Like viewing a completed jigsaw puzzle, Rignot said, the men were stunned when they stood back and took in the full picture. They discovered a new ridge splitting the 5.4 million-square-mile landmass from east to west. They found unnamed formations moving up to 800 feet each year across immense plains sloping toward the Southern Ocean - and in a different manner than past models of ice migration.
"These researchers created something deceptively simple: a map of the speed and direction of ice in Antarctica," said Thomas Wagner, a cryospheric program scientist with NASA's MEaSUREs program, which funded the work.
"But they used it to figure out something fundamentally new: that ice moves by slipping at its bed, not just at the coast but all the way to the deep interior of Antarctica."
"That's critical knowledge for predicting future sea-level rise," he added. "It means that if we lose ice at the coasts from the warming ocean, we open the tap to the ice in the interior."
The work was completed during a period called the International Polar Year, and is the first such study since 1957. Collaborators working under the aegis of the Space Task Group were NASA, European Space Agency, Canadian Space Agency, Japanese Aerospace Exploration Agency, as well as the Alaska Satellite Facility, and MacDonald, Dettwiler and Associates Ltd.
"To our knowledge, this is the first time that a tightly knit collaboration of civilian space agencies has worked together to create such a huge dataset of this type," said Yves Crevier of the Canadian Space Agency.
"It is a dataset of lasting scientific value in assessing the extent and rate of change in polar regions."
Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.
Australia's Antarctic claim at risk: study
Sydney (AFP) Aug 8, 2011
Australia holds the largest claim to Antarctica but risks losing it in any race to unlock the frozen continent's potentially vast mineral and energy resources, an influential thinktank said Monday. With global interest in the icy southern region growing, the Lowy Institute has warned Canberra against complacency when it comes to its claim, which covers 42 percent of Antarctica, an area rough ... read more
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2011 - Space Media Network. AFP and UPI Wire Stories are copyright Agence France-Presse and United Press International. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|