Temperatures over the past 10,000 years recorded in the GISP2 Greenland ice core

Temperatures over the past 10,000 years according to the Greenland Ice Sheet Project (GISP)

Temperatures over the past 10,000 years according to the Greenland Ice Sheet Project (GISP)

Comments

  1. Sam-hec:
    January 2, 2011 at 2:55 pm

    “interesting that the chart provided chose not to include the last 50 years”

    Ice cores aren’t valid for at least 80 years. One has to wait for the snow to compact.

    1. True, though I did not ask for Ice Core Data that recent. Just relevant data for fair comparison. Just the graph by itself without a thesis by the poster murdoc amounts to trolling (yes one can do that on one’s own site). I am not going to do someone else’s homework assignment.

  2. It looks like the “global warming” of the past 150 years or so is actually only a cyclic warming with over 10,000 yrs data to back it up. As a scientist working in both the artic and antartic regions it is a fact that in the past many species associated with temperate zones of Europe and North America have migrated to above the artic circle leaving fossil remains.

    The data presented here only further illustrates that the recorded history climatologicaly of this planet covers less than 500 years and most of that has been a little ice age. Scientist and celbrities push theories that are based on short term data and not centuries of data truly required to say that man alone has raised earths temperature. IE…1660 to 1680 ice covers many rivers and glaciers grew ….1880 a year with no summer..New York City high that summer was 83….1940/41 thousands of German soldiers frozen to death in Russian winter and in fact most of Europe below normal…2010 most of Europe snow covered and rivers freezing…..

    1. “Scientist and celbrities push theories that are based on short term data and not centuries of data truly required to say that man alone has raised earths temperature. ”

      Nope. The Theory is based on observation of CO2’s opacity to infrared radiation. That was from John Tyndall in 1859, and confirmed in 1861 by the Royal Society. All valid doubt regarding this physical property was washed away in the 1950s with military research into the infrared spectrum. Any High School with an Infrared Camera can test this themselves. The theory was defined in 1896 when the first mathematical model was created describing how CO2 should relate to the climate. In 1937 Milankovich Cycles helped to predict long term climate condition but were ignored until the 1970’s when Ice Core data became available for comparison.

    1. Even if this tech is for real, I am not sure how it really helps. Water vapor already has a tiny average residence time of only 7 days. CO2 lasts in the air for several decades. The relative potency of CO2 is about three orders of magnitude greater. It might be good for local climate control however.

      1. “The relative potency of CO2 is about three orders of magnitude greater”

        Wrong. I figured there was no reason to pay attention to you, but I gave you the benefit of the doubt.

        No more.

        1. I am sorry to hear that. I shall try to at least clarify what I meant.

          By ‘potency’ I meant importance.

          CO2 has heat trapping power of X; H2O has heat trapping capacity of 4X.

          H20 as a gas resides on average of 7 days before condensing; CO2 resides in the atmosphere on average around 4 decades or 14600 days.

          7×4=28 CO2 eq heat-trapping days
          14600×1=14600 CO2 eq heat-trapping days
          14600/28=521

          so strictly speaking thats 2 orders of magnitude, not three… my bad. Also that number is not that precise as the mid-range natural cycle time of CO2 is fairly broad.

  3. For anyone interested, here’s the likely source for these numbers, from the NOAA:

    ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/isotopes/gisp2_temp_accum_alley2000.txt

    What strikes me is how stable the climate has been over the last 10,000 years. The graph above records a range of just 4 degrees Celsius, from -28.5 to -32.5. This corresponds to Fahrenheit temperatures of about -19 to -26. The dramatic peaks and valleys in the graph are created by plotting these very small differences on well-spaced 0.5-degree intervals. Following the data back another 10,000-15,000 years (into the last ice age), you can find temperatures below -50C (-58F).

    As has been mentioned, the data end before anthropogenic global warming really takes off, so the graph is useless as an indicator (or disputer) of AGW. It does, however, illustrate how little the mean temperature would have to rise to be significant.

  4. Looks like the URL was cut off. Here’s the last half again, starting at “summit.”

    summit/gisp2/isotopes/gisp2_temp_accum_alley2000.txt

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