Daily Archives: October 16, 2010

History of Arctic (and Antarctic) Sea Ice, Part 1

Nobody in his right mind disputes that since satellite observations began, the extent of sea ice in the arctic has declined dramatically; this year the summer minimum extent was the 3rd-lowest on record. There is also considerable observational evidence that arctic sea ice extent over the last few decades is much lower than it has been for at least a century prior to modern times.

A team of researchers, led by Leonid Polyak of Ohio State University’s Byrd Polar Research Center, has culled the available evidence from hundreds of studies of proxy data for sea ice extent. As reported at Science Daily, in a new paper in Quaternary Science Reviews they report their findings: that the present extent of sea ice in the arctic is at its lowest for at least several thousand years.

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Anthony Watts: Pants on Fire

In my last post I made two predictions. The second one was this:

Second: Either Anthony Watts won’t answer my question about why he’s so fond of less than 6 years’ data when we have over 30 (and that’s just from satellites) — or he’ll attack me personally, calling me a coward for blogging under a pseudonym. After all, the best predictor of future behavior is past behavior.

The question was this:

We have over 30 years of satellite data for arctic sea ice. Why do you consistently display the only data source I know of that covers less than 6 years?

Anthony has replied. But just as I predicted, he didn’t answer my question. Instead he told a lie.

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