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Posted on 07/10/2012 12:53:24 PM PDT by Ernest_at_the_Beach
But I have a question. Is that wood a tone wood?
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It has a shivering tone to it!
Ah, an overall cooling trend.
The cricket chirping from the MSM science illiterates is commencing.....
Welcome to Earth.
The only place in the Universe where the inhabitants complain if the temperature changes more than 1 or 2 degrees Celsius.
And we wonder why the aliens won’t talk to us when they visit.
So there HAS been climate change.......[/sarc]
LOL!
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tornadomark says:
How many want to bet that the Warmists will now declare tree rings unreliable?
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milodonharlani says:
Since the Holocene Climatic Optimum was even warmer than the Roman & Medieval Periods, the cooling trend would be yet more pronounced if extended back another 3000 years or more. Modern warmth is not exceptional, having been exceeded in at least two periods during the past 2000 years.
Perhaps even more tellingly, the previous Eemian Interglacial (114 to 130 kya), was much warmer than today’s Holocene Interglacial. As most here must know, Scandinavia was then an island, hippos swam in the Thames at the site of London, & the raised beaches of Alaska & fossil reefs of the Bahamas were formed. The interglacial before the Eemian (Hoxnian in the UK, Holstein in N. Europe & Mindel-Riss in the Alps, corresponding to Marine Isotope Stage 11, from 374 to 424 kya) was also warmer than our present Holocene. All this without benefit of a Neanderthal or Homo heidelbergensis industrial age burning copious quantities of coal, or even wood, & with “pre-industrial” CO2 levels.
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R Taylor says:
The authors had the decency not to note that CO2 has done nothing but increase during this 2000 years of cooling.
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otsar says:
The cynic in me says that that we will see more publications like this pass peer review as policy makers try to extricate themselves from the corner they have painted themselves into. When I read temperature reconstructions, tree rings, and precisely calculate in the same article my scepticism goes up. I hope they make all of their reasoning and work available. Having said that, I hope this is good work and that there is more forthcoming.
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AndyG55 says:
Doesn’t ice core data show a gradual cooling over the whole Holocene? like this.
How well doe sthis match up against other reconstructions of the same period?
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ntesdorf says:
This looks uncannily like real Scientific Work for a change. Some climate scientists seem to have recalled that they are supposed to be doing rigorous science. Perhaps others will have the courage to follow them now.
It is so easy for the Lie-berals to lie to their moronic followers to simply pick any negative excursion on that graph and compare it to today and shazzzzam the temperature is rising.
To lie with statistics only requires the appropriate beginning and end point. Using SEGMENTS of that graph I can make a case for warming or cooling. Only when viewed over a long period of time (as was the goal of the original post) can a truthful picture of climate change be shown albeit no reason for the change can be extracted.
Unfortunately outside of FOX which the mouth breathers do not watch, the alphabet networks continue to push the glo-bull warming hoax.
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Rob L says:
Too bad that it is treemometers, they will always have questionable validity.
That said as with ice-cores we see the 1000 year warming-cooling cycle that produced the Minoan, Roman, Medieval and now Modern warming, on this graph it appears to have an amplitude of about 0.5-0.7 deg (1-1.5 deg C peak to trough from linear trend). That this cycle coincides with modern warming (which started before significant CO2 rise) is very powerful evidence against “strong” CAGW. Gisp2 cores have similar amplitude, though the long term cooling trend is steeper at about 0.7deg/millenium.
Would be nice to see an expanded vertical axis and a few grid lines to get a better view of the temperature variation, that graph they produced is near useless without a vertical reference.
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Tim Ball says:
Apart from the fact that trees rings don’t, for the most part, reflect temperature, this study is even more problematic because it only looks at summer temperatures. All the actual records show that it is winter temperatures that change the most.
For example, summer temperatures were about the same at the nadir of the Little Ice Age around 1680, but winters were much colder, Since then summer temperatures have remained about the same and winter temperatures have increased creating an increase in annual average.
Summary; Trees don’t represent temperature and half a year doesn’t represent an annual record.
There have been similar studies of petrified trees from millions of years ago. As I recall all they showed was a distinct solar cycle. But that is not surprising because that was the original reasonable application of tree ring studies by Douglass.
A. E. Douglass was an astronomer whose main interest was dendroclimatology, particularly the relationship between midlatitude precipitation patterns, especially drought cycles.
http://ltrr.arizona.edu/sites/ltrr.arizona.edu/files/bibliodocs/Douglass, AE_Evidence of Climatic Effects in the Annual Rings of Trees_1920.pdf
I used his work because I found a similar 22 year drought cycle in a spectral analysis of approximately 200 years of precipitation data for York Factory on Hudson Bay that appeared correlated with sunspot activity. It was an alien idea even then (1982) as my doctoral committee initially rejected that portion of the work. I risked failure but insisted on its inclusion, which, to their credit, they approved.
Theodor Landscheidt later developed the relationship between solar activity and midlatitude droughts.
http://www.john-daly.com/solar/US-drought.htm
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Marks says:
Appears Real Climate and Michael Mann began their spin a day ago on this story:
http://www.realclimate.org/index.php/archives/2012/07/tree-rings-and-climate-some-recent-developments/#more-12427
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George says:
While tree rings by themselves may not represent temperature, the combination of tree rings and the isotopes contained in the wood together can be a pretty good indication.
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