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Tree Ring Evidence Reverses Findings February 26, 2008

Posted by tkcollier in Enviroment.
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DailyTech – Reseacher: Arctic Temperatures “Not Especially Warm”

Grudd’s results contradict his earlier reconstructions of Arctic temperatures, which demonstrated significantly cooler temperatures prior to 1900. The difference, he claims, is due to more accurate scanning of samples, along with a better understanding of how tree ring widths and density respond to temperature changes.

Grudd, of Stockholm University’s Department of Physical Geography and Quaternary Geology, compared both tree ring width and maximum density, to construct the most accurate data yet seen for the region. He found a sharp warming trend since the year 1900. However, over the entire period, several such warming events were seen with temperatures in at least four periods (AD 750, 1000, 1400, and 1750) all equally warm or warmer than at present.

Most surprising of all, he noted, when taken as a whole temperatures in the Arctic have actually declined 0.3 degrees over the past 1,000 years. As Grudd himself says, temperatures at present are “not especially warm.”

The full temperature record also reveals why the last 100 years has appeared unusual — the year 1900 was actually the coldest of the entire period.

Comments»

1. Scientist Man - May 29, 2008

Where’s the link to the raw data and lab notes?
Obviously, I want to review it.

2. tkcollier - May 29, 2008

Text of the full paper can be found here. The work is forthcoming in the peer-reviewed journal Climate Dynamics.


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