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View Diary: Damn those lying scientists.   (159 comments)

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  •  there are records that go back further (1+ / 0-)
    Recommended by:
    RunawayRose

    than 30 years.  And they suggest that the current trend is well outside of normal AO variability.

    Here is one example (that link has a 450 year graph, but the paper in the PDF link shows all 800 years.):

    The 20th century sustained the lowest sea ice extent values since A.D. 1200: low sea ice extent also occurred before (mid 17th and mid 18th centuries, early 15th and late 13th centuries), but these periods were in no case as persistent as in the 20th century. Largest sea ice extent values occurred from the 17th to the 19th centuries, during the Little Ice Age, and smaller sea ice-covered areas occurred in the 16th century. Moderate sea ice extent occurred during 13th to 15th centuries. Reconstructed sea ice extent variability is dominated by decadal and multi-decadal oscillations operating at ~70-90yr, and by a North Atlantic Oscillation/Arctic Oscillation (NAO/AO) decadal component, which occurred repeatedly during the reconstructed period. Sea ice extent and NAO showed a non-stationary relationship during the observational period. The present low sea ice extent is unique over the last 800 years, and results from a decline started in late-19th century after the Little Ice Age.

    I'm still not sure what your overall point is... are you trying to suggest that anthropogenic global climate change is not a reality based simply on Arctic sea ice variability?

    Or are you simply pointing out the potential flaw in that data set, but are convinced of the global trend by the numerous other independent data sets?

    "The more the Democrats pursue the center... the further to the right the "center" moves." -fellow kossack vacantlook

    by Hopeful Skeptic on Fri Mar 05, 2010 at 01:23:36 PM PST

    [ Parent ]

    •  Didn't You Mention - (0+ / 0-)

      Proxy measurements in another post?

      If the early 2000s were to be measured in 500 years, would 2007 show in the proxy?

      •  maybe, maybe not (1+ / 0-)
        Recommended by:
        RunawayRose

        it would depend on the level of resolution of the proxy.  Some do have one year resolutions.  Others do not.

        But what would certainly be obvious in any proxy would be the trend of the last 30-100 years.

        You still have no clarified what your larger point is...  why are you so fixated on Arctic sea ice in 2007?  It's one indicator for one year... in the midst of thousands of data points.  All of which point in the same direction.

        So... I've answered you question, and have been quite civil... and I'm still wondering what are you getting at?

        "The more the Democrats pursue the center... the further to the right the "center" moves." -fellow kossack vacantlook

        by Hopeful Skeptic on Fri Mar 05, 2010 at 03:40:14 PM PST

        [ Parent ]

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