Antartic Ice cap is Growing still

Discussion in 'Environment' started by PLYMCO_PILGRIM, Jul 30, 2009.

  1. PLYMCO_PILGRIM
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    PLYMCO_PILGRIM Gold Member

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  2. Old Rocks
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    Sure

    Thu, 2008-01-24 15:07 — webmaster
    Source: The Australian, Leigh Dayton, Science writer, January 15, 2008

    New data from the NASA GRACE mission satellite shows that ice melt at the edges of the Antarctic is accelerating, and outpacing the build-up of snow in the interior.

    Antarctica's ice melting faster

    Below is an excerpt from this press story:

    "THE most comprehensive study to date of Antarctica's ice confirms growing concern that the ice cap is melting faster than predicted.

    The implications are that the global sea level will rise faster than expected, while a huge influx of freshwater into the salty oceans could alter ocean currents.

    Antarctica holds 90 per cent of Earth's ice.

    According to the new findings, snowfall is topping up ice in the continent's interior and East Antarctic has held its own. But West Antarctica and the Antarctic Peninsula lost nearly 200 billion tonnes of ice in 2006 alone.

    That is 75 per cent more than losses in 1996 and the equivalent of a global sea level rise of more than half a millimetre, claim international scientists led by NASA geoscientist Eric Rignot, also with the University of California, Irvine (UCI).

    "Losses are concentrated along narrow channels occupied by outlet glaciers and are caused by ongoing and past glacier acceleration," the team wrote in the online edition of Nature Geoscience.

    They based their conclusions on satellite data obtained in 1996, 2000 and 2006.

    According to Dr Rignot, the results showed that the Intergovernmental Panel on Climate Change had underestimated the impact of polar melting in its predictions of possible sea level rises next century.

    "Each time I look at some new data, I am astonished," he said.

    Until now, it has been unclear whether snowfall in the interior kept pace with coastal melting, in terms of the overall mass of Antarctic ice.

    But for Hobart glaciologist Ian Allison - with the Australian Antarctic Division and the Antarctic Climate and Ecosystems Co-operative Research Centre - the new findings settle the matter.

    "This work suggests that the ice flow is accelerating," Dr Allison said.

    "It's worrying because ... the changes are happening due to processes we don't understand."

    Dr Allison said the findings confirmed previous work, much by Dr Rignot and another UCI scientist Isabella Velicogna.

    It also fits with observations that the break-up in 1995 and 2002 of two sections of the Larsen ice shelf, in the West Antarctic ice sheet, was sped up by the melting of glaciers that were behind it."

    Antarctica's ice melting faster | lightblueline
     
  3. Old Rocks
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    Ice melting across globe at accelerating rate, NASA says
    Between 1.5 trillion and 2 trillion tons of ice in Greenland, Antarctica and Alaska has melted at an accelerating rate since 2003, according to NASA scientists, in the latest signs of what they say is global warming.

    Using new satellite technology that measures changes in mass in mountain glaciers and ice sheets, NASA geophysicist Scott Luthcke concluded that the losses amounted to enough water to fill the Chesapeake Bay 21 times.
    "The ice tells us in a very real way how the climate is changing," said Luthcke, who will present his findings this week at the American Geophysical Union conference in San Francisco, California.

    View original post here Ice melting across globe at accelerating rate, NASA says - CNN.com

    Melting Ice Nasa | Ice Melting Across Globe At Accelerating Rate, NASA Says - Why Do Glaciers Move - Zimbio
     
  4. k2skier
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    k2skier Senior Member

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    It all depends on which 2 years you want to cherry pick, but overall, yes Antarctica has held steady on square mile of ice coverage in the last 30 years.

    here's what one guy has to say about the article you posted;

    Michael Chiu of Fall City, WA. USA Posted at 2:01am April 21, 2009
    I think opinions expressed civilly are heard more clearly. The expansion of sea ice in the southern polar region is not conflicting with the theory of global warming. This phenomena was predicted in models in 2005 (see Science Daily 6/30/05) and illlustrates the asymmetry of global warming affect (see www.artic.atmos.uiuc ). Caution should be exercised when reading short media accounts of complex scientific matters. One should NEVER reach a conclusion based upon one event, in one geographical location, at one point in time. To do so would be grasping at convenient truths!! The discussion is not if global warming is occurring but rather causation and effect. Politicians and media outlets do not help clarify the causation question with their spin. Neither does vehement attacks and snipes upon each other.
     
    • Thank You! Thank You! x 2
  5. PLYMCO_PILGRIM
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    I just checked that out, thanks for the heads up on the antartics overal remaining unchanged. over 30 years, overall, it has not melted or grown
     
    Last edited: Jul 31, 2009
  6. Old Rocks
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    It has held steady on the square miles of ice coverage. But many billions of tons of ice have melted, and that melt is accelerating. Meanwhile, the north polar ice is melting fast, and may be completely gone during part of the summer by 2030.

    When enough ice has melted in Antarctica, then you will see the square mileage shrink as ground is exposed. And that will create an even greater feedback cyle.
     
  7. code1211
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    In one article I read, though, the average temperature at the South pole has risen to -57 from -60. Either one is cold enough to kill you if... If nothing. It's cold enough to kill you.

    The water tha flows from elsewhere to touch the ice that is being pushed into the water by more ice is warm enough to melt ice. Obviously. It's water. Even Ice Water is pretty hot compared to the air temps down there.

    I've been thinking that this would be a good place to build a prison for the Gitmo detainees that would be more humane.
     
  8. DiveCon
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    so, what year should we expect to see open ground in Antarctica?
     
  9. KittenKoder
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    KittenKoder Senior Member

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    Alright, since your buttplug won't answer I ask this of you:

    What is the purpose of large bodies of ice in the world? What purpose do they serve to nature since everything natural has a purpose and reason.
     
  10. code1211
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    code1211 Senior Member

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    There three pretty distinct areas of the antarctic in terms of climate: The interior, the coast and the Western penninsula.

    What you are describing is occurring mostly on the western penninsula. Warming is probably occurring in the Antarctic, but with the very few measuring stations, it's a little difficult to make a case either way.

    As far as you prediction of dire consequence, if the ice is not touching water, it's not very likely that it will permanently melt anytime soon at about -60 degrees.
     

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