Truth About Arctic and Greenland Ice

Discussion in 'Environment' started by Sinatra, May 29, 2009.

  1. Sinatra
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    Sinatra Senior Member

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    Leonard Weinstein ScD, former member of NASA and current member of the National Institute of Aerospace, elaborates on the actual temperature fluctuations and the resulting impacts on Arctic and Greenland ice cover - and deflates the CO2 connection utilized by the Global Warmers.

    In his paper Weinstein makes clear that the Antarctic is actually cooling and sea ice formation is expanding - but the focus of the paper is primarily on the Arctic regions.

    One of the more interesting aspects of Weinstein's work was his blasting of the more recent temperature graphs that are so often utilized to display dramatic rising in Arctic temperatures - such as this example:

    [​IMG]

    My goodness that does look dramatic!!!

    But of course, that graph has a starting point at a low temperature period for that region that took place in the 1960s and 1970s. (When all those environut "Impending Ice Age" stories were taking place)

    When one shows a far more responsible scientific temperature graph going back to the 1800s, we see today's Arctic temperatures in a far less alarming light:

    [​IMG]

    Here we see quite varied fluctuations in Arctic temperatures over a hundred-plus time span - and note that by far the warmest period was in fact the 1940s - nearly 70 years ago!! Current arctic temperatures are similar to what they were in the early 1960's, cooler than the were in the 1950's, and far cooler than they were in the 1930's and
    1940's. The one time period when temperatures were dramatically cooler was the end of the 19th Century when the earth was coming out of what is commonly called a "Little Ice Age." (Which some in the scientific community are stating we are heading into another such phase: Russian Scientist Predicts 'mini Ice Age' - Due to low solar activity - Softpedia Weinstein also notes that the largest jump in recent Arctic temperatures occured at the turn of the 20th Century, long before the more current increases in man-made CO2 levels took place.

    If one utilizes an even longer time period of Arctic temperatures, we realize today's "alarming" temperatures are in fact on the cooler side of normal. Weinstein makes the quite plausible claim that the more popular current temperature maps that take a brief and selective view of current temperatures are nothing more than pre-determined scientific arlarmism:

    [​IMG]



    The Truth About Arctic and Greenland Ice « the Air Vent
     
    Last edited: May 29, 2009
  2. Old Rocks
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    Old Rocks Diamond Member

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    Satellites Show Arctic Literally on Thin Ice04.06.09 Additional imagery and background information for this story can be found here.

    This data visualization from the AMSR-E instrument on the Aqua satellite show the maximum sea ice extent for 2008-09, which occurred on Feb. 28, 2009. Credit: NASA Goddard's Scientific Visualization Studio
    > Larger image

    During the winter, winds and currents push some of the thick, multi-year ice out of the Arctic Ocean. In the past, that thicker ice was replenished by new ice that survived several summer melt seasons. Credit: Chuck Fowler and Jim Maslanik, University of Colorado, and NSIDC
    > View animated GIF

    Maps show the relative age of Arctic sea ice at the end of February 2009 and over time. Thin, first-year ice is the predominant type covering the Arctic Ocean this winter. Credit: Chuck Fowler and Jim Maslanik, University of Colorado, and NSIDC
    > Larger image

    The decline in multiyear (including second-year ice) sea ice coverage has also been measured by NASA’s QuikScat satellite from 1999 to 2009. Each field shows the coverage on January 1 of that year. There is a 40 percent drop in coverage between 2005 and 2007. Credit: Ron Kwok, NASA/JPL
    > Larger image The latest Arctic sea ice data from NASA and the National Snow and Ice Data Center show that the decade-long trend of shrinking sea ice cover is continuing. New evidence from satellite observations also shows that the ice cap is thinning as well.

    Arctic sea ice works like an air conditioner for the global climate system. Ice naturally cools air and water masses, plays a key role in ocean circulation, and reflects solar radiation back into space. In recent years, Arctic sea ice has been declining at a surprising rate.

    Scientists who track Arctic sea ice cover from space announced today that this winter had the fifth lowest maximum ice extent on record. The six lowest maximum events since satellite monitoring began in 1979 have all occurred in the past six years (2004-2009).

    Until recently, the majority of Arctic sea ice survived at least one summer and often several. But things have changed dramatically, according to a team of University of Colorado, Boulder, scientists led by Charles Fowler. Thin seasonal ice -- ice that melts and re-freezes every year -- makes up about 70 percent of the Arctic sea ice in wintertime, up from 40 to 50 percent in the 1980s and 1990s. Thicker ice, which survives two or more years, now comprises just 10 percent of wintertime ice cover, down from 30 to 40 percent.

    NASA - Satellites Show Arctic Literally on Thin Ice
     
  3. Old Rocks
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  4. Old Rocks
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    Old Rocks Diamond Member

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    The world's second largest ice cap may be melting three times faster than indicated by previous measurements, according to newly released gravity data collected by satellites.

    The Greenland Ice Sheet shrank at a rate of about 239 cubic kilometres per year from April 2002 to November 2005, a team from the University of Texas at Austin, US, found. In the last 18 months of the measurements, ice melting has appeared to accelerate, particularly in southeastern Greenland.

    "This is a good study which confirms that indeed the Greenland ice sheet is losing a large amount of mass and that the mass loss is increasing with time," says Eric Rignot, from NASA's Jet Propulsion Laboratory in Pasadena, California, US, who led a separate study that reached a similar conclusion earlier in 2006 (See Greenland's glaciers are speeding to the ocean). His team used satellites to measure the velocity of glacier movement and calculate net ice loss.

    Yet another technique, which uses a laser to measure the altitude of the surface, determined that the ice sheet was losing about 80 cubic kilometres of ice annually between 1997 and 2003. The newer measurements suggest the ice loss is three times that.

    "Acceleration of ice mass loss over Greenland, if confirmed, would be consistent with proposed increased global warming in recent years, and would indicate additional polar ice sheet contributions to global sea level rise," write the University of Texas researchers in the journal Science.
    Greenland ice cap may be melting at triple speed - environment - 10 August 2006 - New Scientist
     
  5. Sinatra
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    Sinatra Senior Member

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    Sorry Old Rocks, you did nothing but persist in putting up "projected maybe it could be..." kind of bought and paid for opinion papers.

    The facts are facts - the arctic has been considerably warmer than it is now - the 1930s adn 1940s most recently. Temps have been in decline. CO2 connection appears quite mixed. And Antarctica is also cooling.
     
  6. Oddball
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    HERETIC!!!! :lol:
     
  7. Chris
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    Weinstein is an engineer, not a climatologist.

    Meanwhile, CO2 continues to rise, and the ice continues to melt.
     
  8. Old Rocks
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    No, the Antarctic is not cooling.
    Access : Warming of the Antarctic ice-sheet surface since the 1957 International Geophysical Year : Nature


    Nature 457, 459-462 (22 January 2009) | doi:10.1038/nature07669; Received 14 January 2008; Accepted 1 December 2008



    Eric J. Steig
    David P. Schneider
    Scott D. Rutherford
    Michael E. Mann
    Josefino C. Comiso
    Drew T. Shindell
    more authors of this article


    Eric J. Steig1, David P. Schneider2, Scott D. Rutherford3, Michael E. Mann4, Josefino C. Comiso5 & Drew T. Shindell6

    Department of Earth and Space Sciences and Quaternary Research Center, University of Washington, Seattle, Washington 98195, USA
    National Center for Atmospheric Research, Boulder, Colorado 80307, USA
    Department of Environmental Science, Roger Williams University, Bristol, Rhode Island, USA
    Department of Meteorology, and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA
    NASA Laboratory for Hydrospheric and Biospheric Sciences, NASA Goddard Space Flight Center, Greenbelt, Maryland 20771, USA
    NASA Goddard Institute for Space Studies and Center for Climate Systems Research, Columbia University, New York, New York 10025, USA
    Correspondence to: Eric J. Steig1 Correspondence and requests for materials should be addressed to E.J.S. (Email: steig@ess.washington.edu).


    Top of pageAbstractAssessments of Antarctic temperature change have emphasized the contrast between strong warming of the Antarctic Peninsula and slight cooling of the Antarctic continental interior in recent decades1. This pattern of temperature change has been attributed to the increased strength of the circumpolar westerlies, largely in response to changes in stratospheric ozone2. This picture, however, is substantially incomplete owing to the sparseness and short duration of the observations. Here we show that significant warming extends well beyond the Antarctic Peninsula to cover most of West Antarctica, an area of warming much larger than previously reported. West Antarctic warming exceeds 0.1 °C per decade over the past 50 years, and is strongest in winter and spring. Although this is partly offset by autumn cooling in East Antarctica, the continent-wide average near-surface temperature trend is positive. Simulations using a general circulation model reproduce the essential features of the spatial pattern and the long-term trend, and we suggest that neither can be attributed directly to increases in the strength of the westerlies. Instead, regional changes in atmospheric circulation and associated changes in sea surface temperature and sea ice are required to explain the enhanced warming in West Antarctica.
     
  9. RetiredGySgt
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    And yet the graph CLEARLY shows the current trend is much smaller then the 40's and for a lesser duration. So why was there any ice left in the 50's? What caused the rise in temperature in the 3o's and 40's?

    Why are you and Old Rocks so intent on ignoring facts?
     
  10. Sinatra
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    Sinatra Senior Member

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    Steig????

    Are you aware of his drop in standing in the academic community with that cooked data of his?

    NO, you would not be aware of that because you have no connection to academia.

    Steig is a fraud and is scrambling to retain his position at the UW - even his fellow enviros are unhappy with his sham of a report.

    And shame on you - you persist in repeating his lie despite having been told of it before.

    I expect more from you - stop dissapointing...
     

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