More “hiding the decline”

More “hiding the decline”. Anthony Watts excerpts a Steve McIntyre post about some oxygen isotope data (a temperature proxy) from the Law Dome in Antarctica that wasn’t used by the evil climatologists because it proves that there was a Medieval Warm Period all over the world.

Except it doesn’t. It’s just one in a collection of historical southern hemisphere temperature proxies. Some are more reliable than others, some show warming trends during different time periods and some don’t. The Law Dome oxygen isotope data exclusion was described in the report, but McIntyre chooses to label that as insufficient. Surprise!

Why wasn’t used? McIntyre has only conspiracy theories. His ignorance must be hard-won because he includes, but completely disregards, this quote from Dr. Jonathan Overpeck in a stolen “Climategate” e-mail:

If we have multiple conflicting temp recons from Law Dome, and one can’t be shown from the literature as being the best, then we should state that, and show neither.

That seems like a clear reason to me. But hey Steve throw it against the wall, mutter a bit, and see if it sticks!

I love “Dr.” Steve’s quote from his own IPCC AR4 Review comments:

6-1231 B 34:12 34:12 What happened to the Law Dome proxy? Why isn’t it shown? [Stephen McIntyre (Reviewer’s comment ID #: 309-115)]

The distilled essence of obsessive nit-picking! Not an ounce (err, gram) of scientific purpose behind the comment. A useful comment would have made a case for including the Law Dome proxy, but all Steve can say is “why?”.

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