Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
..
. Earth Science News .




ICE WORLD
Preglacial landscape found deep under Greenland ice
by Staff Writers
Washington (AFP) April 18, 2014


US geologists said Thursday they have uncovered a preglacial tundra landscape preserved for 2.7 million years far below the Greenland ice sheet.

Glaciers are known to scrape everything off any given plot of land -- vegetation, soil and even the top layer of bedrock -- so scientists expressed great surprise that they had found the landscape in pristine condition below two miles (three kilometers) of ice.

The finding provides strong evidence that the ice sheet has existed for much longer than previously known, and survived numerous global warming episodes, according to the lead researcher, University of Vermont geologist Paul Bierman.

Rather than scraping and sculpting the landscape, the ice sheet has been frozen to the ground, effectively creating "a refrigerator that's preserved this antique landscape," Bierman said.

The finding suggests that even during the warmest periods of the ice sheet's life, the center of Greenland was stable and did not fully melt, allowing the tundra landscape to be sealed without modification through millions of years of changing temperatures.

"Greenland really was green! However, it was millions of years ago," said Dylan Rood, a former Lawrence Livermore National Laboratory scientist.

"Greenland looked like the green Alaskan tundra, before it was covered by the second largest body of ice on Earth."

For the study published in the journal Science, experts tested 17 samples extracted from the ice sheet in 1993 from Summit, Greenland.

They then sampled a rare form of the element beryllium, the beryllium-10 isotope formed by cosmic rays.

The research, backed by National Science Foundation funding, found that the soil had been stable and exposed at the surface between 200,000 and a million years before the ice covered it.

The team of scientists also measured nitrogen and carbon that could have been left by plant material in the core sample, and found organic material that suggested that the preglacial landscape may have been a partially forested tundra.

.


Related Links
Beyond the Ice Age






Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle




Memory Foam Mattress Review
Newsletters :: SpaceDaily :: SpaceWar :: TerraDaily :: Energy Daily
XML Feeds :: Space News :: Earth News :: War News :: Solar Energy News





ICE WORLD
The role of oceanic carbon reservoir over glacial cycles
Beijing, China (SPX) Apr 17, 2014
Glacial cycles at 104-yr time scale have been the focus of Quaternary paleoclimatology over the last century. In recent years with the emergence of continuous high-resolution records (ice cores, deep-sea sediments etc.) from the longer geological past, increasing evidence underscores the significance of long- duration processes at the time scale of 105-yr or more. WANG Pinxian and colleagu ... read more


ICE WORLD
Malaysia vows to be transparent with 'black box' data

Mini-sub to dive again after aborting first MH370 search

US housing effort in Haiti falls short: official

Two dead, 293 missing in S. Korea ferry capsize

ICE WORLD
New Self-healing Plastics Developed

New technique takes cues from astronomy and ophthalmology to sharpen microscope images

Cork trees offer greener source of polyester

Vanguard Space Technologies Antenna Reflectors on Amazonas Satellite Launch

ICE WORLD
Uncharted depths provide reality check for MH370 hunt

Reef fish arrived in two waves

Researchers describe four new species of "killer sponges" from the deep sea

Water users can reduce the risk of spreading invasive species

ICE WORLD
New technology helps paleontologists see Ice-Age bee in intricate detail

The role of oceanic carbon reservoir over glacial cycles

Canada boycotts Arctic Council meeting in Moscow

La Brea Tar Pit fossil research shows climate change drove evolution of Ice Age predators

ICE WORLD
Oyster aquaculture could significantly improve Potomac River estuary water quality

Pioneering findings on the dual role of carbon dioxide in photosynthesis

Danone says China recall weighs on first-quarter sales

GM crops under the microscope at international debate

ICE WORLD
Magnitude 7.5 quake strikes off Solomon Islands: USGS

Cyclone warning lifted on Australia's Barrier Reef coast

Increase in activity at DRC's Nyamulagira volcano

Death toll rises to 23 in Solomons floods

ICE WORLD
Obama to meet Djibouti President on May 5

Campaigning conservationist shot in DR Congo

US Marines headed to Chad park to fight poaching

Top Nigerian Islamic body accuses military over Muslim deaths

ICE WORLD
Evolution explains facial hair trends

Neanderthals and Cro-magnons did not coincide on the Iberian Peninsula

New method confirms humans and Neandertals interbred

Indigenous societies' 'first contact' typically brings collapse, but rebounds are possible




The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news 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 All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.