NASA: Unprecedented melting of Greenland's ice sheet

Discussion in 'Environment' started by Star, Jul 24, 2012.

  1. Star
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    Star Gold Member

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    Unprecedented melting of Greenland's ice sheet this month has stunned NASA scientists and has highlighted broader concerns that the region is losing a remarkable amount of ice overall.

    According to a NASA press release, about half of Greenland's surface ice sheet naturally melts during an average summer. But the data from three independent satellites this July, analyzed by NASA and university scientists, showed that in less than a week, the amount of thawed ice sheet surface skyrocketed from 40 percent to 97 percent.

    In over 30 years of observations, satellites have never measured this amount of melting, which reaches nearly all of Greenland's surface ice cover.

    When Son Nghiem of NASA's Jet Propulsion Laboratory observed the recent melting phenomenon, he said in the NASA press release, "This was so extraordinary that at first I questioned the result: Was this real or was it due to a data error?"

    Scientists at NASA's Goddard Space Flight Center, University of Georgia-Athens and City University of New York all confirmed the remarkable ice melt.

    NASA's cryosphere program manager, Tom Wagner, credited the power of satellites for observing the melt and explained to The Huffington Post that, although this specific event may be part of a natural variation, "We have abundant evidence that Greenland is losing ice, probably because of global warming, and it's significantly contributing to sea level rise."

    Wagner said that ice is clearly thinning around the periphery, changing Greenland's overall ice mass, and he believes this is primarily due to warming ocean waters "eating away at the ice." He cautiously added, "It seems likely that's correlated with anthropogenic warming."

    This specific extreme melt occurred in large part due to an unusual weather pattern over Greenland this year, what the NASA press release describes as a series of "heat domes," or an "unusually strong ridge of warm air."
    Notable melting occurred in specific regions of Greenland, such as the area around Summit Station, located two miles above sea level. Not since 1889 has this kind of melting occurred, according to ice core analysis described in NASA's press release.

    Goddard glaciologist Lora Koenig said that similar melting events occur about every 150 years, and this event is consistent with that schedule, citing the previous 1889 melt. But, she added, "if we continue to observe melting events like this in upcoming years, it will be worrisome."
    "One of the big questions is 'What's happening in the Arctic in general?'" Wagner said to HuffPost.

    Just last week, another unusual event occurred in the region: the calving of an iceberg twice the size of Manhattan from Greenland's Petermann Glacier.

    Over the past few months, separate studies have emerged that suggest humans are playing a "dominant role" in ocean warming, and that specific regions of the world, such as the U.S. East Coast, are increasingly vulnerable to sea level rise.

    Wagner explained that in recent years, studies have observed thinning sea ice and "dramatic" overall changes. He was clear, "We don’t want to lose sight of the fact that Greenland is losing a tremendous amount of ice overall."

    [​IMG]
    NASA CAPTION: Extent of surface melt over Greenland’s ice sheet on July 8 (left) and July 12 (right). Measurements from three satellites showed that on July 8, about 40 percent of the ice sheet had undergone thawing at or near the surface. In just a few days, the melting had dramatically accelerated and an estimated 97 percent of the ice sheet surface had thawed by July 12. In the image, the areas classified as “probable melt” (light pink) correspond to those sites where at least one satellite detected surface melting. The areas classified as “melt” (dark pink) correspond to sites where two or three satellites detected surface melting. The satellites are measuring different physical properties at different scales and are passing over Greenland at different times. As a whole, they provide a picture of an extreme melt event about which scientists are very confident. Credit: Nicolo E. DiGirolamo, SSAI/NASA GSFC, and Jesse Allen, NASA Earth Observatory
     
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  2. waltky
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    waltky Wise ol' monkey Supporting Member

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    Guess dey didn't figger what would happen when the ice melted...
    [​IMG]
    Thaw could release Cold War-era U.S. toxic waste buried under Greenland's ice
    August 5, 2016) - Global warming could release radioactive waste stored in an abandoned Cold War-era U.S. military camp deep under Greenland's ice caps if a thaw continues to spread in coming decades, scientists said on Friday.
     
  3. skookerasbil
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    skookerasbil Gold Member

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    lol.....we hear this every year. And the scientists are always "stunned" too!!:rofl::rofl::eusa_dance:
     
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  4. Crick
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    Crick Gold Member

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    This article is from 2012. If we're hearing about it every year, why the old repost?
     
  5. AnCap'n_Murica
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    AnCap'n_Murica Gold Member

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    Unprecedented?

    I imagine medieval Nordic settlers might tell a different tale.
     
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  6. bear513
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    bear513 Gold Member

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    Clearly we are not doing our part crick to save Greenland, we must as a world community, tie 100,000 barges to Greenland and tow it north.

    We all must leave our A/Cs on as low as they can go and have the Windows open to cool the planet.
     
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  7. Crick
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    Crick Gold Member

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    I'm not as worried about Greenland as the rest of the world's coastlines their melting ice will submerge.
     
  8. LaDexter
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    LaDexter Silver Member

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  9. Crick
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    Crick Gold Member

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    Scientists Map Movement of Greenland Ice During Past 9,000 Years
    AUSTIN, Texas — Scientists have created the first map that shows how the Greenland Ice Sheet has moved over time, revealing that ice in the interior is moving more slowly toward the edges than it has, on average, during the past 9,000 years.

    The findings, which researchers said don’t change the fact that the ice sheet is losing mass overall and contributing to sea level rise, are published in the Feb. 5 issue of Science. Along Greenland’s periphery, many glaciers are rapidly thinning. However, the vast interior of Greenland is slowly thickening, a process the new study clarifies.

    “Scientists are very interested in understanding how ice sheets flow and how that flow may have been different in the past. Our paleo-velocity map for Greenland allows us to assess the flow of the ice sheet right now in the context of the last several thousand years,” said lead author Joe MacGregor of The University of Texas at Austin’s Institute for Geophysics (UTIG), a research unit of the Jackson School of Geosciences.

    The study builds on earlier UTIG-led research that developed a database of the many layers within Greenland’s ice sheet. Using this database, the scientists determined the flow pattern for the past 9,000 years — in effect creating a “paleo-velocity” map.
     
  10. LaDexter
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    LaDexter Silver Member

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    Meanwhile, the Vikings were there farming the southern tip of Greenland until the 1400s, when that area went under ice age glacier, and is still under ice age glacier which is now a lot thicker...

    so, in total, according to Crick


    farmable land is COLDER than ice age glacier...


    and THAT is THE IDIOCY of THE FRAUD
     

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