Posted on 01/29/2008 11:13:13 AM PST by E. Pluribus Unum
Download original article here.
A Global Temperature History of the Past Two Millennia
Reference
Loehle, C. 2007. A 2000-year global temperature reconstruction based on non-treering proxies. Energy and Environment 18: 1049-1058.
What was done
Using data from eighteen 2000-year-long proxy temperature series from all around the world that were not developed from tree-ring data (which provide significant interpretive challenges), the author (1) smoothed the data in each series with a 30-year running mean, (2) converted the results thereby obtained to anomalies by subtracting the mean of each series from each member of that series, and then (3) derived the final mean temperature anomaly history defined by the eighteen data sets by a simple averaging of the individual anomaly series, a procedure that he rightfully emphasizes is "transparent and simple."
What was learned
The results obtained by this procedure are depicted in the figure below, where it can be seen, in the words of its creator, that "the mean series shows the Medieval Warm Period (MWP) and Little Ice Age (LIA) quite clearly, with the MWP being approximately 0.3°C warmer than 20th century values."
What it means
Loehle notes that "the 1995-year reconstruction shown here does not match the famous hockey stick shape," which clearly suggests that one of them is a poorer, and the other a better, representation of the truth. Because of its simplicity and transparency, as well as a host of other reasons described in detail by Loehle -- plus what we have learned since initiating our Medieval Warm Period Record-of-the Week feature -- it is our belief that Loehle's curve is by far the superior of the two in terms of the degree to which it likely approximates the truth.
Reviewed 30 January 2008
The AGW propononents use a single temperature proxy, tree-rings, to predict global catastrophe.
This article uses the average of 18 temperature proxies for the past two-thousand years.
This is definitive data, folks.
Any time an enviro-wacko calls you a global-warming denier, wave this article in their face and ask them to refute it.
If there isn't any global warming, there isn't any anthropogenic component either.
bump for ammo.
Coincidence? I think not.
bump
POGW Ping.
I’ll bet that their sacrifice quota shot way up. And rightly so.
Thanks. Well Done.
I downloaded the article immediately.
I didn't notice it was missing.
Too bad they can’t get sunspots data going back that far, or can they?
Boomp.
Gadzooks. The author used creditable data, processed it in a meaningful way, did not throw away “inconvenient” data, and presented the results in a clear and understandable way. He’ll never be reported in the NYT.
Must be a witch. Burn him!
self bump
The graph helps. I am at work, so I have to scan articles.
Was that John McCain I heard today pledging to be green and to do something about greenhouse gases?
Gorey be to Al !
A HERETIC !! A HERETIC !!
A HERETIC PRESENTING AN INCONVENIENT TRUTH !!
Let him be subjected to le pein forte et dure !!
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