"Surfer" wrote in :

http://news.sciencemag.org/scienceno...gas-is-no-weak
ling.html

Start extract

The issue with Antarctic ice cores was that they recorded a rise in
temperature ahead of the rise in carbon dioxide. How could the
greenhouse gas be causing the warming, skeptics asked, if it wasn't in
the atmosphere when the warming started?

But climate scientists know that no one region is representative of
global climate trends. So Jeremy Shakun of Harvard University and his
colleagues created a global temperature record. They combined 80
records of temperature over the past 22,000 years retrieved from
around the world, ranging in latitude from Antarctica to Greenland.
The seven types of records included ice cores whose oxygen isotopes
record varying temperature. There were also pollen from lake muds and
microfossils from ocean sediments, whose species and abundance reflect
temperature.

Once a globally representative record came together, the data clearly
showed carbon dioxide rising ahead of rising temperature , as it
should if the greenhouse gas were helping drive the world out of the
ice age. The warming of Antarctica ahead of carbon dioxide's rise was
a red herring, Shakun and his colleagues conclude online today in
Nature.

To see why, the researchers drew on a climate model as well as a
variety of other climate records. They saw changes in the far north
that triggered southward-marching changes in ocean and atmospheric
circulation that eventually reached Antarctica. The immediate effect?
There was an early warming as South Atlantic currents that normally
carry heat away to the north stalled. But that warming came before the
same changes triggered the release of much carbon dioxide from the
deep ocean. As a result, Antarctic warming got a jump on the rest of
the world, but carbon dioxide went on to warm the globe as a whole.

The new global temperature record "is quite an achievement," says Eric
Wolff, a paleoclimatologist at the British Antarctic Survey in
Cambridge, the United Kingdom. The early Antarctic warming "has been a
thorn in the side of climate scientists," he says, but "one doesn't
have to deal with that issue anymore."

End extract

Shakun et al. paper he

Global warming preceded by increasing carbon dioxide concentrations
during the last deglaciation
http://www.nature.com/nature/journal...ture10915.html


See Eschenbach:

http://tinyurl.com/7bde4bu

"No way that the proxies could support the title of the paper" and -
surprise surprise - they fudged it ...

"troppo" wrote in message
...
"Surfer" wrote in :


Shakun et al. paper he

Global warming preceded by increasing carbon dioxide concentrations
during the last deglaciation
http://www.nature.com/nature/journal...ture10915.html


See Eschenbach:

http://tinyurl.com/7bde4bu

Thank you.


"No way that the proxies could support the title of the paper"

Maybe.


and - surprise surprise - they fudged it ...

That is not clear.

Eschenbach writes:
"Look how they have cut the modern end of the ice core CO2 record short...."

But the following graph in the Shakun et al. paper doesn't have that problem
http://www.nature.com/nature/journal...10915-f2.2.jpg

The caption says:
"The global proxy temperature stack (blue) as deviations from the early
Holocene (11.5-6.5?kyr ago) mean, an Antarctic ice-core composite
temperature record42 (red), and atmospheric CO2 concentration (refs 12, 13;
yellow dots)."

On 08/04/12 16:51, troppo wrote:
wrote in :

http://news.sciencemag.org/scienceno...gas-is-no-weak
ling.html


See Eschenbach:

http://tinyurl.com/7bde4bu

"No way that the proxies could support the title of the paper" and -
surprise surprise - they fudged it ...

Not only that. Even they admit that the order of events was (assuming
their misunderstanding of their own data were correct):

A: Antarctica warms
B: CO2 goes up
C: The rest of the world warms.

So how did Antarctica do it? Go up that is, before the CO2. Is
Antarctica the world's Oracle of Delphi?

But on to the author's "logic":

"B before C "proves" B caused C."

What if A caused them both? What if something else caused all of them?

In short, this drivel is the death of the once-respected Nature
used-to-be "journal".


--
Ron House
Building Peace: http://peacelegacy.org
Australian Birds: http://wingedhearts.org
Principle of Goodness academic site: http://principleofgoodness.net