Posted on 12/17/2004 2:27:50 AM PST by Exton1
A 1240-Year Record of Arctic Temperatures
Reference
Moore, J.J., Hughen, K.A., Miller, G.H. and Overpeck, J.T. 2001. Little Ice Age recorded in summer temperature reconstruction from varved sediments of Donard Lake, Baffin Island, Canada. Journal of Paleolimnology 25: 503-517.
What was done
Lake sediment cores from Donard Lake, Baffin Island, Canada (approximately 66.25°N, 62°W), were analyzed to produce a 1240-year record of average summer temperatures for this region.
What was learned
Over the entire 1240-year period from 750-1990 A.D., summer temperatures averaged
2.9°C. Anomalously warm decades with summer temperatures as high as 4°C occurred around 1000 and 1100 A.D. At the beginning of the 13th century, Donard Lake witnessed "one of the largest climatic transitions in over a millennium," as "average summer temperatures rose rapidly by nearly 2°C from 1195-1220 A.D., ending in the warmest decade in the record" with temperatures near 4.5°C.
The rapid warming of the 13th century was followed by a period of extended warmth that lasted until an abrupt cooling event occurred around 1375 A.D. The decade following 1375 A.D. was one of the coldest in the record and represented the onset of the Little Ice Age on Baffin Island, which lasted for 400 years. At the modern end of the record, a gradual warming trend occurred over the period 1800-1900 A.D., followed by a dramatic cooling event in 1900 that brought temperatures back to levels consistent with the Little Ice Age, which lasted until about 1950. Temperatures warmed during the 1950s and 1960s, whereupon they have trended toward cooler conditions to the present.
What it means
Large abrupt swings in temperature appear to be a consistent feature of climate in this region of the world, with temperatures rising and falling by as much as 2°C in as short a time period as a decade. Such natural temperature variability demonstrates the high degree of difficulty associated with attempting to separate effects of anthropogenic climatic forcing from those of natural causes.
In contradiction of politically-correct climatology, the study also demonstrates the existence of both the Medieval Warm Period and Little Ice Age on Baffin Island. And it stands in stark contrast to the climate alarmist claim that the latter part of the 20th century experienced "unprecedented" warming, at least in this part of the world, which is, however, where such anthropogenic phenomena are supposed to be most evident.
Page printed from: http://www.co2science.org/journal/2001/v4n32c1.htm
Cool! You managed to get 4 mistakes in one sentence! That is a rare thing on FR. That's usually a DU feature, troll.
What size WAS the earth, BTW?
Sediment cores (snicker) Might as well have had them stick a finger in the water, roll their eyes back chanting, then just start writing estimates. Bout as useful.
It is hugh and series.
Actually, I should make that 5 errors.
"Excessive chariot exhaust?
No silly, there were no catalytic converters on the horses's exhausts!
It won't happen. All you have to do it tell them all the friction from that scrubbing will cause global warming. They'll say, "Oh, yeah, you're right!"
You know some environmentalist wack job is gonna troll through here, read about "scrubbing" oxidation off rocks and think it's a good idea.
granite faces on our mountains in Utah are oxidizing
Nah, that's easy! Too much oxygen. If we drive more SUVs, there'll be less oxygen, and Earth will get bigger. Therefore, as the pressure drops, the mountains will get cleaner. Simple. Oh bummer, I forgot: all life dies at 15%...
;)
Does this mean I will die soon or live to see Hillary loose the 2008 election?
We will ALL die. Remember how they say the Clintons take up all the oxygen?
Yes, the Earth was a size 32 waist, but now in middle-age it is a 36.
Get lost troll.
Did you know that you're full of crap?
You know some environmentalist wack job is gonna troll through here, read about "scrubbing" oxidation off rocks and think it's a good idea.
You may have something there. Let me sleep on it a while.
Ah, yet more research that shows that the "Medieval Climate Optimum" period was indeed global, and not an "anomaly confined to Western Europe (or the Northern Hemisphere)" as the "global warmers" are so fond of claiming.
Spaceballs again.
"No silly, there were no catalytic converters on the horses's exhausts!"
Dung Beetles........apparently not effective though?
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