Geology Times
Recent News |  Archives |  Tags |  About |  Newsletter |  Submit News |  Earthquakes |  Subscribe to GeologyTimes.com RSS Feed Subscribe


More Articles
Batteries included: A solar cell that stores its own powerBatteries included: A solar cell that stores its own power

Lift weights, improve your memoryLift weights, improve your memory

Beyond LEDs: Brighter, new energy-saving flat panel lights based on carbon nanotubesBeyond LEDs: Brighter, new energy-saving flat panel lights based on carbon nanotubes

Hubble project maps temperature, water vapor on wild exoplanetHubble project maps temperature, water vapor on wild exoplanet

Magnetic mirrors enable new technologies by reflecting light in uncanny waysMagnetic mirrors enable new technologies by reflecting light in uncanny ways

Structure of an iron-transport protein revealedStructure of an iron-transport protein revealed

First step: From human cells to tissue-engineered esophagusFirst step: From human cells to tissue-engineered esophagus

Autophagy helps fast track stem cell activationAutophagy helps fast track stem cell activation

Charged graphene gives DNA a stage to perform molecular gymnasticsCharged graphene gives DNA a stage to perform molecular gymnastics

Myelin vital for learning new practical skillsMyelin vital for learning new practical skills

Spiders: Survival of the fittest groupSpiders: Survival of the fittest group

More physical activity improved school performanceMore physical activity improved school performance

Building a bridge from basic botany to applied agricultureBuilding a bridge from basic botany to applied agriculture

Engineering new vehicle powertrainsEngineering new vehicle powertrains

Stunning finds from ancient Greek shipwreckStunning finds from ancient Greek shipwreck

Around the world in 400,000 years: The journey of the red foxAround the world in 400,000 years: The journey of the red fox

Active aging is much more than exerciseActive aging is much more than exercise

Study: New device can slow, reverse heart failureStudy: New device can slow, reverse heart failure

Are the world's religions ready for ET?Are the world's religions ready for ET?

Gut bacteria, artificial sweeteners and glucose intoleranceGut bacteria, artificial sweeteners and glucose intolerance

Recreating the stripe patterns found in animals by engineering synthetic gene networksRecreating the stripe patterns found in animals by engineering synthetic gene networks

Laying the groundwork for data-driven scienceLaying the groundwork for data-driven science

Hold on, tiger momHold on, tiger mom

Nature's designs inspire research into new light-based technologiesNature's designs inspire research into new light-based technologies

Missing piece found to help solve concussion puzzleMissing piece found to help solve concussion puzzle

Biologists delay the aging process by 'remote control'Biologists delay the aging process by 'remote control'

Geography matters: Model predicts how local 'shocks' influence U.S. economyGeography matters: Model predicts how local 'shocks' influence U.S. economy

Identified for the first time what kind of explosive has been used after the detonationIdentified for the first time what kind of explosive has been used after the detonation

Copied from nature: Detecting software errors via genetic algorithmsCopied from nature: Detecting software errors via genetic algorithms

NASA data reveals mega-canyon under Greenland Ice Sheet (9/2/2013)

Tags:
arctic, bedrock, grand canyon, greenland, ice, instruments, lead, research, sea ice, water, waves

Data from a NASA airborne science mission reveals evidence of a large and previously unknown canyon hidden under a mile of Greenland ice.

The canyon has the characteristics of a winding river channel and is at least 460 miles (750 kilometers) long, making it longer than the Grand Canyon. In some places, it is as deep as 2,600 feet (800 meters), on scale with segments of the Grand Canyon. This immense feature is thought to predate the ice sheet that has covered Greenland for the last few million years.

"One might assume that the landscape of the Earth has been fully explored and mapped," said Jonathan Bamber, professor of physical geography at the University of Bristol in the United Kingdom, and lead author of the study. "Our research shows there's still a lot left to discover."

Bamber's team published its findings Thursday in the journal Science.

The scientists used thousands of miles of airborne radar data, collected by NASA and researchers from the United Kingdom and Germany over several decades, to piece together the landscape lying beneath the Greenland ice sheet.

A large portion of this data was collected from 2009 through 2012 by NASA's Operation IceBridge, an airborne science campaign that studies polar ice. One of IceBridge's scientific instruments, the Multichannel Coherent Radar Depth Sounder, can see through vast layers of ice to measure its thickness and the shape of bedrock below.

In their analysis of the radar data, the team discovered a continuous bedrock canyon that extends from almost the center of the island and ends beneath the Petermann Glacier fjord in northern Greenland.

At certain frequencies, radio waves can travel through the ice and bounce off the bedrock underneath. The amount of times the radio waves took to bounce back helped researchers determine the depth of the canyon. The longer it took, the deeper the bedrock feature.

"Two things helped lead to this discovery," said Michael Studinger, IceBridge project scientist at NASA's Goddard Space Flight Center in Greenbelt, Md. "It was the enormous amount of data collected by IceBridge and the work of combining it with other datasets into a Greenland-wide compilation of all existing data that makes this feature appear in front of our eyes."

The researchers believe the canyon plays an important role in transporting sub-glacial meltwater from the interior of Greenland to the edge of the ice sheet into the ocean. Evidence suggests that before the presence of the ice sheet, as much as 4 million years ago, water flowed in the canyon from the interior to the coast and was a major river system.

"It is quite remarkable that a channel the size of the Grand Canyon is discovered in the 21st century below the Greenland ice sheet," said Studinger. "It shows how little we still know about the bedrock below large continental ice sheets."

The IceBridge campaign will return to Greenland in March 2014 to continue collecting data on land and sea ice in the Arctic using a suite of instruments that includes ice-penetrating radar.

Video
Click on this image to view the .mp4 video
Hidden for all of human history, a 460-mile-long canyon has been discovered below Greenland's ice sheet. Using radar data from NASA's Operation IceBridge and other airborne campaigns, scientists led by a team from the University of Bristol found the canyon runs from near the center of the island northward to the fjord of the Petermann Glacier. A large portion of the data was collected by IceBridge from 2009 through 2012. One of the mission's scientific instruments, the Multichannel Coherent Radar Depth Sounder, operated by the Center for the Remote Sensing of Ice Sheets at the University of Kansas, can see through vast layers of ice to measure its thickness and the shape of bedrock below. This is a narrated version of an animation that can be found, along with more detailed information, here: Greenland's Mega-Canyon beneath the Ice Sheet (id 4097) - NASA SVS

Note: This story has been adapted from a news release issued by the NASA/Goddard Space Flight Center

Post Comments:

Search

New Articles
Rivers flow differently over gravel beds, study findsRivers flow differently over gravel beds, study finds

Scientists find ancient mountains that fed early lifeScientists find ancient mountains that fed early life

NASA study finds 1934 had worst drought of last thousand years

Researchers solve riddle of the rock poolsResearchers solve riddle of the rock pools

Researchers turn to 3-D technology to examine the formation of cliffband landscapesResearchers turn to 3-D technology to examine the formation of cliffband landscapes

Microfossils reveal warm oceans had less oxygen, geologists sayMicrofossils reveal warm oceans had less oxygen, geologists say

Scientists discover carbonate rocks are unrecognized methane sink

A unique approach to monitoring groundwater supplies near Ohio fracking sitesA unique approach to monitoring groundwater supplies near Ohio fracking sites

Geologists dig into science around the globe, on land and at sea

Past climate change and continental ice melt linked to varying CO2 levels

Hydraulic fracturing linked to earthquakes in Ohio

Earth's magnetic field could flip within a human lifetimeEarth's magnetic field could flip within a human lifetime

Icebergs once drifted to Florida, new climate model suggestsIcebergs once drifted to Florida, new climate model suggests

Space-based methane maps find largest US signal in Southwest

Chicxulub didn't do it all by itselfChicxulub didn't do it all by itself



Archives
October 2014
September 2014
August 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
July 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
April 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007


Science Friends
Agricultural Science
Astronomy News
Biology News
Biomimicry Science
Cognitive Research
Chemistry News
Tissue Engineering
Cancer Research
Cybernetics Research
Electonics Research
Forensics Report
Fossil News
Genetic Archaeology
Genetics News
Microbiology Research
Nanotech News
Parenting News
Physics News


  Archives |  Submit News |  Advertise With Us |  Contact Us |  Links
Use of this site constitutes acceptance of our Terms of Service and Privacy Policy. All contents © 2000 - 2015 Web Doodle, LLC. All rights reserved.