Greenland close to unavoidable meltdown

Discussion in 'Environment' started by Matthew, Jan 8, 2011.

  1. Matthew
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    Matthew Blue dog all the way!

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    Greenland close to unavoidable meltdown
    Foto: JOHN MCCONNICO (arkivfoto)/AP

    AF Julian Isherwood

    The result of an international scientific paper, based on data and models from the Danish Meteorological Institute, is suggesting that an eventual meltdown of Greenland’s ice-cap is almost unavoidable.

    According to the model used in a paper published in the Journal of Hydrometeorology, irrespective of how much CO2 emissions are limited, Greenland will reach a point of no return in 2040 at the latest.

    “This is a very worrying result as it shows that melting can go a lot quicker than we normally think,” says one of the report’s co-authors, Jens Hesselbjerg Christensen.

    The report, entitled “Greenland Ice Sheet Surface Mass-Balance Modeling in a 131-Yr Perspective, 1950–2080” and prepared by research centres at the University of Alaska Fairbanks, the University of Colorado and the Danish Meteorological Institute says that the ice-cap mass balance: “was close to equilibrium during the relatively cold 1970s and 1980s and lost mass rapidly as the climate warmed in the 1990s and 2000s with no indication of deceleration”.

    “It is essential to predict and assess the impact of future climate on the Greenland Ice Sheet (GRIS), which is believed to be influenced by human activities. We must establish the present and future state of the GrIS surface melt extent and surface mass balance, including freshwater flux,to detect warning signs indicative of its future response,” the report says.

    After 2040, on a time scale of 1,000 years ahead, it will not be possible for the giant Greenland ice-cap to be re-created and return to current levels.

    “Over the next 30 years the amount of snowfall will not compensate for melting,” Hesselbjerg Christensen tells pol.dk adding: “Based on our model, I would almost say that the point of no return has already been passed. Our result shows in principle that permanent meltdown is unavoidable.”

    Hesselbjerg Christensen is head of Denmark’s Climate Centre and is a co-author of the latest UN Intergovernmental Panel on Climate Change (IPCC) report on regional climate change.

    He says, however, that according to the model it will take more than 1,000 years before the Greenland ice-cap has more or less disappeared.

    “If Greenland’s ice-cap melted completely, it would result in a 6-7 metre increase in world sea levels,” Hesselbjerg Christensen says.

    Greenland close to unavoidable meltdown - Politiken.dk

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    Posting because it is important to debate these issues. Show them right or wrong. :tongue:
     
  2. westwall
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    westwall USMB Mod Staff Member Gold Supporting Member Supporting Member

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    It's not worth the time Matthew. More hyperbole and frankly his numbers are so far off as to be silly. If they started melting at the highest rate ever recorded it would take 16,000 years for the Greenland ice sheet to melt. This guy is a fool.
     
  3. Matthew
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    Matthew Blue dog all the way!

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    I agree west. The rate would have to go into the stratosphere. This is hype.

    For one who to say that the decrease of ice within Greenland couldn't turn around and start increasing within the next few hundred years?
     
    Last edited: Jan 8, 2011
  4. Mr. Sauerkraut
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    Mr. Sauerkraut Active Member

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    they´ve already startet with winegrowing
     
  5. iamwhatiseem
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    iamwhatiseem Gold Member

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    Holy Crap...this photo just on from Greenland...it seems the ice shield melted in about 20 minutes...incredible!!!
     

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  6. Revere
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    North Americans need more tropical destinations now that Mexico has gone to hell.
     
  7. iamwhatiseem
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    iamwhatiseem Gold Member

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  8. Baruch Menachem
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  9. BenNatuf
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    When they can model something that actually happens let us know.

    Models... LOL.
     
  10. Old Rocks
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    One thousand years does seem very fast. However, it took only ten to eleven thousand years for the continental glaciers in North America to melt, and that was a lot more ice than Greenland has.

    At this point, our understanding of the mechanics of the melting of huge volumes of ice is hardly advanced enough to create any kind of accurate model.
     

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