Research

There is a heat source under Antarctica's melting ice sheet

There is a heat source under Antarctica's melting ice sheet

Understanding the sources of the meltwater under West Antarctica will help determine the rate at which ice may be lost to the ocean in the future.

The Marie Byrd Land mantle plume formed 50 to 110 million years ago, long before the West Antarctic ice sheet came into existence. This rise and fall motion of the ice surface also helps the scientists to estimate the quantity of water at certain places.

About three decades ago, a researcher at the University of Colorado Denver had suggested possible seismic activity in Mary Byrd Land, but there was not enough proof to substantiate it.

Hélène Seroussi of NASA's Jet Propulsion Laboratory in Pasadena, California, said when she first heard the idea, she "thought it was insane". "However, the presence of the plume is important, as it suggests the ice is more vulnerable in this area: this additional heat warms the ice, which suggests greater weakness in the face of future and past changes in the environment", she added.

However, recent seismic imaging seems to confirm the hypothesis.

More news: Morocco and Tunisia qualify for World Cup

The scientists note in the study published this week in the Journal of Geophysical Research that mantle plumes are not new phenomena. Instead, this heating source will enable the scientists to explain the reason behind the rapid collapse of ice sheets during climatic changes.

Researchers calculated that the rate of the transfer of energy from the mantle plume must be no more than 150 milliwatts per square meter. For comparison, in USA regions with no volcanic activity, the heat flux from Earth's mantle is 40 to 60 milliwatts. (A milliwatt is one-thousandth of a watt.) For comparison, a typical stretch of land in the United States gets about 40 to 60 milliwatts per square meter of geothermal heat, and Yellowstone gets about 200 milliwatts per square meter.

A heat flow higher than 150 milliwatts per square was detected nowhere, except in one location: an area inland of the Ross Sea known for intense flows of water. The buoyancy of the material, some of it molten, causes the crust to bulge upward.

NASA's Jet Propulsion Laboratory were able to crack the mystery by creating a data model of a mantle plume based on observations of the geothermal activity at Yellowstone, which hosts a supervolcano.

A mantle plume, which is an area where geothermal heat generated deep within the planet pushes closer to the surface through cracks other gaps, is thought to be responsible for huge subsurface lakes and water flow underneath the ice sheet.


  • Jason Bateman's wife Amanda Anka accuses hotelier Andre Balazs of groping her

    Jason Bateman's wife Amanda Anka accuses hotelier Andre Balazs of groping her

    Back downstairs, an irate Bateman allegedly spit his gum in Balazs' face before quickly leaving the hotel with his wife. Among those who confirmed the assault on Ms Anka to the Times was comedian Charlie Day's wife Mary Elizabeth Ellis .

    Interpublic Group of Companies, Inc

    T Rowe Price Group Inc now has $22.62B valuation. (The) in a report issued on Wednesday, according to Zacks Investment Research . The transaction was disclosed in a filing with the Securities & Exchange Commission, which is available at the SEC website .
    Massive Income Tax raids at premises of Sasikala kin enters third day

    Massive Income Tax raids at premises of Sasikala kin enters third day

    Chennai: The massive search and survey operation unleashed by the income tax department in the state entered second day on Friday. Dinakaran. "But the details of these seizures can not be confirmed now", the official said.
  • Observations: Missouri 50, Tennessee 17

    Observations: Missouri 50, Tennessee 17

    On Mizzou's next series, Lock launched a throw down the seam but somehow missed safety Nigel Warrior sitting on the hashmarks. Three snaps later Rountree punched in a 1-yard go-ahead touchdown, giving the Tigers a 24-17 lead heading into halftime.
    Japan PM Abe Says Welcomes Broad Agreement on TPP Trade Deal

    Japan PM Abe Says Welcomes Broad Agreement on TPP Trade Deal

    He said the flight of American manufacturing to China after it opened to foreign trade and investment hurt USA workers. Unlike the TPP trade pact, whose decisions will eventually be enforced, APEC's statements are nonbinding.
    Imran Abbas hopes Salman Khan's Tiger Zinda Hai releases in Pakistan

    Imran Abbas hopes Salman Khan's Tiger Zinda Hai releases in Pakistan

    If we go by the already released posters of the film, Ali Abbas Zafar has not taken a risk when it comes to making it grand. Tiger Zinda Hai has received this response on only 4 days of its trailer release.
  • When Shah Rukh Khan was heckled by Maharashta MLC on his birthday

    When Shah Rukh Khan was heckled by Maharashta MLC on his birthday

    As per sources, Shah Rukh Khan was returning to Gateway of India in his private yacht, after celebrating his birthday in Alibaug. Bollywood's King Shah Rukh Khan's birthday celebration in Alibag with close friends was trending everywhere on 2nd November .
    BU Concussion Expert Gives Alarming Update On Aaron Hernandez's Brain

    BU Concussion Expert Gives Alarming Update On Aaron Hernandez's Brain

    Formerly a tight end for the New England Patriots , Hernandez was serving a life sentence for the murder of Odin Lloyd in 2013. In April he committed suicide by hanging in a MA prison while serving a life sentence for Odin Lloyd's 2013 murder.
    Jazz center Rudy Gobert sidelined vs. Nets with right knee contusion

    Jazz center Rudy Gobert sidelined vs. Nets with right knee contusion

    He is listed as questionable for Saturday's back-to-back game against the Nets. "I was feeling a little sore", he said. Gobert briefly exited the game but returned and finished with 12 points and 12 rebounds in 35 minutes.
  • Only The Almighty Can Determine Robert Mugabe's Fate, Says Grace

    Only The Almighty Can Determine Robert Mugabe's Fate, Says Grace

    They were allegedly part of a group of people who disrupted her speech in Bulawayo last Saturday. He was sacked two days after the heckling and has since fled to neighbouring South Africa.
    Matches to Make After UFC Fight Night 'Poirier vs. Pettis'

    Matches to Make After UFC Fight Night 'Poirier vs. Pettis'

    Poirier with some ground and pound, but then he stands over Pettis and the former champ does a nice job of sweeping him. Battered, bloodied and ultimately broken, Pettis tapped 2:08 into Round 3 after suffering an apparent rib injury.
    Trump applauds Indian democracy, PM Modi

    Trump applauds Indian democracy, PM Modi

    The bilateral meeting comes just three days after the US President commended India and Modi for the country's "astounding growth". On November 13, the Prime Minister will attend the ASEAN business and investment summit.