Electrodynamic Blue Star: Hottest Earth In One Thousand Years!

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LeagueOfTheLastDays, Twain <yonibluestar@> wrote:

 

BBC NEWS | Science/Nature | Climate 'warmest for millennium'

 

http://news.bbc.co.uk/2/hi/science/nature/4698652.stm

 

LeagueOfTheLastDays/

 

Climate 'warmest for millennium'

By Paul Rincon

BBC News science reporter

 

 

Sunbathers during 2005 Paris heatwave, AP

 

The last 100 years is more striking than either the Medieval Warm Period

or Little Ice Age

 

Timothy Osborn, UEA

 

In the late 20th Century, the northern hemisphere experienced its most

widespread warmth for 1,200 years, according to the journal Science.

 

The findings support evidence pointing to unprecedented recent warming

of the climate linked to greenhouse emissions.

 

University of East Anglia researchers measured changes in fossil shells,

tree rings, ice cores and other past temperature records or "proxies".

 

They also looked at people's diaries from the last 750 years.

 

Timothy Osborn and Keith Briffa of UEA analysed instrument measurements

of temperature from 1856 onwards to establish the geographic extent of

recent warming.

 

Then they compared this data with evidence dating back as far as AD 800.

 

The analysis confirmed periods of significant warmth in the Northern

Hemisphere from AD 890 - 1170 (the so-called "Medieval Warm Period") and

for much colder periods from 1580 - 1850 (the "Little Ice Age").

 

Natural records

 

The UEA team showed that the present warm period is the most widespread

temperature anomaly of any kind since the ninth century.

 

"The last 100 years is more striking than either [the Medieval Warm

Period or Little Ice Age]. It is a period of widespread warmth affecting

nearly all the records that we analysed from the same time," co-author

Timothy Osborn told the BBC.

 

Osborn and Briffa used 14 sets of temperature records from different

locations across the Northern Hemisphere.

 

The records included long life evergreen trees growing in Scandinavia,

Siberia and the Rockies which had been cored to reveal the patterns of

wide and narrow tree rings over time. Wider rings related to warmer

temperatures.

 

The chemical composition of ice from cores drilled in the Greenland ice

sheets revealed which years were warmer than others.

 

Dear diary

 

The researchers used proxy data developed from the diaries of people

living in the Netherlands and Belgium during the past 750 years that

revealed, for example, the years when the canals froze.

 

"These records extend over many centuries and even thousands of years.

We simply counted how many of those records indicated that, in any one

year, temperatures were warmer than average for the region they came

from," said Dr Osborn.

 

Professor John Waterhouse, director of the Environmental Sciences

Research Centre Anglia Ruskin University in Cambridge commented:

"Although we're getting increasingly accurate measurements of

present-day temperature, we've got nothing like that from the past to

compare those with.

 

"There's much uncertainty in past reconstructions. You've got to look at

the reconstructed data in the past in light of the likely errors that

those data have."

 

But he added: "As we get more and more evidence in, it is looking as if

the current period is the warmest for over 1,000 years."

 

In November, Science published a paper showing atmospheric levels of the

greenhouse gases carbon dioxide and methane are higher now than at any

time in the past 650,000 years.

 

Roger L. Bagula { email: rlbagula@ or rlbagulatftn@ }

 

11759 Waterhill Road,

Lakeside, Ca. 92040 telephone: 619-561-0814

 

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