Antarctica may melt despite evidence showing it’s not

Mount Erebus in AntarcticaMount Erebus in AntarcticaIn 500 years, sea levels could be more than 15 meters (50 feet!) higher than current levels. That’s according to a new study published this week in the journal Nature. They base this on greenhouse gas emission scenarios fed into computer simulations to interpret sea level estimates. They also say that by the year 2100, we could have a 1.5 meter (nearly 5 feet) rise in sea levels. How were they able to reach these dire conclusions? By utilizing mechanisms previously discounted by other studies.

The study’s lead author is Professor Robert DeConto of the University of Massachusetts, and Dr David Pollard of Pennsylvania State University contributed as well. They note that previous estimates of global sea level rise may have “underestimated the problem by half because they failed to incorporate the full effects of factors including the break-up of ice sheets.”

Not only do their results run counter to what the Intergovernmental Panel on Climate Change (IPCC) has previously predicted, but they say their new study is a stark warning to coastal communities and low lying areas. Over the past 100 years, the global average sea level rise ranges between 0.8 to 3.3 mm per year, with an average rate of 1.8 mm per year. The IPCC’s last assessment report projected a worst-case scenario of 1 meter (3.2 feet) by 2100, and under a lower emissions scenario a rise of .28-.6 meters by 2100.

This new study “focused on the boundary between the ice and the seas – namely glaciers and ice sheets in Antarctica and Greenland.” DeConto and Pollard showed that the “instability of ice sheets and ice cliffs could be an important contributor to past and future ice retreat, leading to creeping sea levels.” The new study is twice as high as previous guesstimates,

They also predict that Antarctica alone could contribute more than one meter of sea-level rise by the year 2100, and greater than 50ft (15 meters) by 2500 if atmospheric emissions continue unabated. The study’s authors focused largely on West Antarctica and Greenland, with the former sitting on an geologically active fault zone. Part of West Antarctica is melting from beneath from warm water heated by tectonic pressure, magma, and friction. This area of the continent is home to some of the world’s largest volcanoes, though many are covered in snow and don’t have the uniformly accepted appearance of a lava-spewing caldera.

NASA has already concluded that despite all this, Antarctica has actually gaining ice due to heavy snowfall that never melts, slowing sea level rise. Sea levels also vary depending on where you are located due to thermal expansion. The paper says that “research has focused on the role of the ocean, melting floating ice shelves from below. It is often overlooked that the major ice shelves in the Ross and Weddell Seas are also vulnerable to atmospheric warming.”

Ice sheets already floating on water that melt do not add to increased sea level rise as the ice shelves are already displacing the water beneath it. The study argues that if these ice sheets melt from atmospheric influences, it would allow land ice to melt further and end up in the oceans. If the current rate of sea level was at the top tier of 3.3 mm per year, that would equate to 84 inches by 2100. Current sea level rise are measured via the Jason-1, Jason-2, and TOPEX/Poseidon satellites, as well as tidal gauges located across the oceans.

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  • Avatar

    Edmonton Al

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    This quote..
    “That’s according to a new study published this week in the journal Nature. They base this on greenhouse gas emission scenarios fed into computer simulations to interpret sea level estimates.”
    FIRSTLY:
    The UN IPCC must prove that CO2 is capable of causing global warming.
    The GHG Theory has been debunked.
    Yet, the Alarmists ans Warmists continue to do studies based on this fallacy.
    They know that the science is wrong wrt to AGW, so it has become a political agenda with no proof, whatsoever, That a trace gas CO2, can cause global warming, hence climate change.

    Reply

  • Avatar

    GR82DRV

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    Once credible dead tree journals like Nature, National Geographic, and others have prostituted themselves to the point that they are now full-time propaganda sources for a leftist political movement that is their pimp.

    If you’re really brave play a drinking game with random issue of any of these journals. Take a shot each time climate change is implied as a potential source for [u][b]every[/b][/u] malady, real or imagined, that these journals can infer. The sky’s the limit here as these people twist themselves into knots imagining every possibly (or impossible) iteration of “scientific” doomsday scenarios that can only be solved by socioeconomic redistribution of wealth and political power.

    Bottoms up!

    Reply

  • Avatar

    MIner49er

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    The article, and the study, both fail to mention the numerous volcanoes under the West Antarctic ice sheet. Maybe climate is warming. It is supposed to be warming, because the earth is emerging from an ice age. Which begs the question why some scientists and government agencies would pad the record by “adjusting” prior-period temperature data.

    Carbon dioxide emissions and fossil fuels use are beneficial, and climate change is a false premise for regulating them. See Patrick Moore’s recently released lecture http://www.thegwpf.com/28155/.

    There is no empirical evidence that CO2 from fossil fuels affects climate. Human activities cause only about 3% of all carbon dioxide (CO2) emissions to the atmosphere. The rest arise from rotting vegetation.

    CO2 is in equilibrium. Mineral carbonates are the ultimate repository of atmospheric CO2. Anyone who passed 10th grade chemistry can know this using public information. Limestone and marble are familiar forms of mineral carbonate. CO2 is an essential component of mineral carbonate (CaCO3, for calcium). For more detail see the paper http://bit.ly/1NziTF4 by Danish researcher Tom Segalstad, and http://quadrant.org.au/opinion

    Carbonates form in seawater and soils through biological and chemical calcification processes. The simplified formula is CO2 + CaO => CaCO3. Anyone can make magnesium carbonate in a kitchen in a few minutes by mixing carbonated water with milk of magnesia.

    Reply

  • Avatar

    Amber

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    Climate “science ” is full of speculation ,and prophesies of doom based on extremely limited actual knowledge . It is one of the only fields that can model any outcome you want and sell it as credible . That is why it was so easy to buy the results which are alleged to underpin the scary global warming heist . You either produce scary global warming out comes or you get no grant money . Betray of truth and integrity to ensure you have funding .
    If people actually saw how few people created the political documents generated by the IPCC they would be shocked .
    The models predicting temperature change have grossly overstated temperatures by up to 200% and are scientifically meaningless .

    There will come a time soon when the people that created this fraud will be exposed for what they are . Too many people involved to keep a lid on it .

    You know they are done when the only thing they have left are preachy hollow threats for a distraction .

    Reply

  • Avatar

    Aido

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    500 years, eh?

    Canny. These bozos won’t be around to see their prediction fail.

    Hansen, Gore, Ehrlich and the rest should have taken a leaf out of their book.

    Reply

  • Avatar

    Steve Frankes

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    Cant these gooses understand that the poles are the furthest points from the heat source known as the sun it would be impossible for them to melt via any atmospheric gas retaining enough heat to melt them.

    Reply

  • Avatar

    ralph

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    [quote name=”GR82DRV”]Once credible dead tree journals like Nature, National Geographic, and others have prostituted themselves to the point that they are now full-time propaganda sources for a leftist political movement that is their pimp.

    If you’re really brave play a drinking game with random issue of any of these journals. Take a shot each time climate change is implied as a potential source for [u][b]every[/b][/u] malady, real or imagined, that these journals can infer. The sky’s the limit here as these people twist themselves into knots imagining every possibly (or impossible) iteration of “scientific” doomsday scenarios that can only be solved by socioeconomic redistribution of wealth and political power.

    Bottoms up![/quote]
    [quote name=”GR82DRV”]Once credible dead tree journals like Nature, National Geographic, and others have prostituted themselves to the point that they are now full-time propaganda sources for a leftist political movement that is their pimp.

    If you’re really brave play a drinking game with random issue of any of these journals. Take a shot each time climate change is implied as a potential source for [u][b]every[/b][/u] malady, real or imagined, that these journals can infer. The sky’s the limit here as these people twist themselves into knots imagining every possibly (or impossible) iteration of “scientific” doomsday scenarios that can only be solved by socioeconomic redistribution of wealth and political power.

    Bottoms up![/quote]

    Add Popular Science to that list.

    Reply

  • Avatar

    . cc

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    I assert that I could become a hall of fame shooting guard for the Lakers, and may one day surpass all the records set by Kobe Bryant. This can happen simultaneously with the total melting of the Antarctic continental ice sheet.

    Reply

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