Medieval warming WAS global – new science contradicts IPCC

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Posted in Science, 23rd March 2012 08:58 GMT

More peer-reviewed science contradicting the warming-alarmist "scientific consensus" was announced yesterday, as a new study shows that the well-documented warm period which took place in medieval times was not limited to Europe, or the northern hemisphere: it reached all the way to Antarctica. The research involved the development of a new means of assessing past temperatures, to add to existing methods such as tree ring analysis and ice cores. In this study, scientists analysed samples of a crystal called ikaite, which forms in cold waters. “Ikaite is an icy version of limestone,” explains earth-sciences prof Zunli Lu. “The crystals are only stable under cold conditions and actually melt at room temperature.”

Down in the Antarctic peninsula that isn't a problem, and Lu and his colleagues were able to take samples which had been present for hundreds of years and date their formation. The structure of Ikaite, it turns out, varies measurably depending on the temperature when it forms, allowing boffins to construct an accurate past temperature record.

A proper temperature record for Antarctica is particularly interesting, as it illuminates one of the main debates in global-warming/climate-change: namely, were the so-called Medieval Warm Period and Little Ice Age merely regional, or were they global events? The medieval warmup experienced by northern Europeans from say 900AD to 1250AD seems to have been at least as hot as anything seen in the industrial era. If it was worldwide in extent that would strongly suggest that global warming may just be something that happens from time to time, not something caused by miniscule concentrations of CO[SUB]2[/SUB] (the atmosphere is 0.04 per cent CO[SUB]2[/SUB] right now; this figure might climb to 0.07 per cent in the medium term).

The oft-mentioned "scientific consensus", based in large part on the work of famous climate-alarmist scientists Michael Mann and Phil Jones and reflected in the statements of the Intergovernmental Panel on Climate Change (IPCC), says that isn't true. The IPCC consensus is that the medieval warming – and the "Little Ice Age" which followed it – only happened in Europe and maybe some other northern areas. They were local events only, and globally the world was cooler than it is now. The temperature increase seen in the latter half of the 20th century is a new thing caused by humanity's carbon emissions.

Lu and his colleagues' new work, however, indicates that in fact the medieval warm period and little ice age were both felt right down to Antarctica. “We showed that the Northern European climate events influenced climate conditions in Antarctica,” says the prof, who was at Oxford when most of the work was done but now has a position at Syracuse uni in the States. He and his colleagues write:

This ikaite record qualitatively supports that both the Medieval Warm Period and Little Ice Age extended to the Antarctic Peninsula. In other words, global warming has already occurred in historical, pre-industrial times, and then gone away again. Lu et al's work is published in the peer-reviewed journal Earth and Planetary Science Letters. ®


http://www.theregister.co.uk/2012/03/23/warm_period_little_ice_age_global/
 
Climate was HOTTER in Roman, medieval times than now: Study

Posted in Science, 10th July 2012 11:44 GMT

Americans sweltering in the recent record-breaking heatwave may not believe it - but it seems that our ancestors suffered through much hotter summers in times gone by, several of them within the last 2,000 years.

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A new study measuring temperatures over the past two millennia has concluded that in fact the temperatures seen in the last decade are far from being the hottest in history. A large team of scientists making a comprehensive study of data from tree rings say that in fact global temperatures have been on a falling trend for the past 2,000 years and they have often been noticeably higher than they are today - despite the absence of any significant amounts of human-released carbon dioxide in the atmosphere back then.

"We found that previous estimates of historical temperatures during the Roman era and the Middle Ages were too low," says Professor-Doktor Jan Esper of the Johannes Gutenberg-Universität Mainz, one of the scientists leading the study. "Such findings are also significant with regard to climate policy." They certainly are, as it is a central plank of climate policy worldwide that the current temperatures are the highest ever seen for many millennia, and that this results from rising levels of atmospheric CO[SUB]2[/SUB] emitted by human activities such as industry, transport etc.

If it is the case that actually the climate has often been warmer without any significant CO[SUB]2[/SUB] emissions having taken place - suggesting that CO[SUB]2[/SUB] emissions simply aren't that important - the case for huge efforts to cut those emissions largely disappears. Needless to say, prominent alarmist scientists and the UN's Intergovernmental Panel on Climate Change (IPCC) have not taken this view, arguing instead that the well-documented Roman and medieval warm periods may have taken place but either weren't very warm or only happened in limited regions (though this latter idea has lately been seriously undermined by research in Antarctica). In the IPCC view, the planet was cooler during Roman times and the medieval warm spell. Overall the temperature is headed up - perhaps wildly up, according to the famous/infamous "hockey stick" graph.

The new study indicates that that's quite wrong, with the current warming less serious than the Romans and others since have seen - and the overall trend actually down by a noticeable 0.3°C per millennium, which the scientists believe is probably down to gradual long-term shifts in the position of the Sun and the Earth's path around it. "This figure we calculated may not seem particularly significant," says Esper. "However, it is also not negligible when compared to global warming, which up to now has been less than 1°C. Our results suggest that the large-scale climate reconstruction shown by the Intergovernmental Panel on Climate Change (IPCC) likely underestimate this long-term cooling trend over the past few millennia."

According to the scientists' new paper, published in hefty climate journal Nature Climate Change, the cooling effect of orbital shifting on the climate has been up to four times as powerful as anthropogenic (human-caused) warming pressures. ®

http://www.theregister.co.uk/2012/07/10/global_warming_undermined_by_study_of_climate_change/
 

I wonder how much he's paid for this type of spam. How many threads today alone? Full of BS paraded as information. I'm glad to see you aren't bothering with argument...he's spoiling for another long rant with someone to kick. Don't waste your time.
 
I wonder how much he's paid for this type of spam. How many threads today alone? Full of BS paraded as information. I'm glad to see you aren't bothering with argument...he's spoiling for another long rant with someone to kick. Don't waste your time.

Apparently you have a problem with peer reviewed papers submitted to heavy duty journals like Nature.
 
I wonder how much he's paid for this type of spam. How many threads today alone? Full of BS paraded as information. I'm glad to see you aren't bothering with argument...he's spoiling for another long rant with someone to kick. Don't waste your time.

Are you seriously trying to convince people that you have the props to discuss the science, rather than just make specious comments that reveal your ignorance?
 
I wonder how much he's paid for this type of spam. How many threads today alone? Full of BS paraded as information. I'm glad to see you aren't bothering with argument...he's spoiling for another long rant with someone to kick. Don't waste your time.

kindly cite even a smidgen of this supposed BS.
Fact is, you warmers are ignorant fucks who haven't bothered to read the science and probably have no plans to do so.
 
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