IN MAY of this year, when things were going swimmingly for
David Karoly and Joelle Gergis and their co-authored claim that Australia is
hotter now than at any time since Ethelred the Unready was King of England, The
Age’s resident green megaphone Adam Morton waxed rhapsodic about the coming
climate catastrophe and the weight of evidence that settled the science behind
this assertion once and for all. The headline on his article was a half-witty
invocation of the alleged scientific method, which in this instance involved the
charting of tree growth (and other “proxies”) to establish when the thermometer
rose and fell. “Climate
research has ring of truth” the title insisted, followed by some 1,300
words of unquestioning and largely unqualified enthusiasm:
Co-author
and University of Melbourne climate science professor David Karoly says the
study for the first time establishes that claims there was a substantial
mediaeval warm period hotter than today had no basis in Australasia. The study
uses climate proxies - surrogates for the record of observed temperatures that
date back to only the early 20th century.
Initially,
the data from tree rings and other sites was tested for its ability to
reconstruct temperatures between 1921 and 1990. The palaeoclimate records from
50 sites were compared to the actual temperature record for these years. The
palaeoclimatic data that did not display a statistically significant
temperature signal, but was found to have been more strongly influenced by
other climate factors such as rainfall, was excluded. But the data from the 27
sites that remained collectively matched the actual temperature increase with a
high correlation coefficient of 0.83, and were considered suitable for use as a
proxy for the real thing to reconstruct temperatures over previous centuries.
The
results matched what was known about certain historical periods. It was found
early European settlers would have suffered through the coldest period of the
past millennium in the 1830s and 1840s - the peak of what is known as the
global little ice age. In pre-industrial times, the warmest lengthy stretch was
found to be between 1238 and 1267, which the study estimates was 0.09 degrees
cooler than the mid-to-late 20th century average.
But the
warmest decades were found to be the last three examined: the 1970s, 1980s and
1990s. Instrumental temperature records show the first decade of the 21st
century was hotter again....
Now let us leap
three weeks forward from the date of that Age article’s publication. It is
early June and Karoly and his confederates have just been made aware that their
research methods are fatally flawed, data useless and the bally-hooed study likely
to become an object of immense ridicule.
How to react? According
to those
astonishing emails just released in response to an FOI request, Karoly knew
just what to do: First, add this additional paragraph to the earlier press
release spruiking Karoly and Gergis’ alleged achievement.
An issue has been identified in the processing of the data used in the
study, which may affect the results. While the paper states that "both
proxy climate and instrumental data were linearly detrended over the 1921-1990
period”: we discovered on Tuesday 5 June that the records used in the final
analysis were not detrended for proxy selection, making this statement
incorrect. Although this is an unfortunate data processing issue, it is likely
to have implications for the results reported in the study. The journal has
been contacted and the publication of the study has been put on hold.
That done, it was
time to deal with the press, as Karoly explains in an email sent on June 11:
There have been emails from Andy Revkin of teh (sic) New York Times and
Adam Morton at the Age. Adam will have a short article in the Age tomorrow, to
update his piece that covered the original paper at length 3 weeks ago.
Karoly & Co
weren’t having much luck chronicling past temperatures, but the climate guru’s
prediction of what Morton would be writing verged on the clairvoyant. It was indeed a “short
article”. A very short article, reproduced
below in its entirety.
A WIDELY
reported study that found the past half-century in Australasia was very likely
the warmest in a millennium has been ''put on hold'' after a mistake was found
in the paper.
Led by
scientists from the University of Melbourne, the study involved analysis of
palaeoclimatic data from tree rings, coral and ice cores to give what was
described as the most complete climate record of the region over the past 1000
years.
It was
peer-reviewed and published online by the Journal of Climate in May, but
was removed from the website last week at the authors' request after the
discovery of a ''data processing issue'' that could affect the results.
Study
co-author and climate science professor David Karoly said one of the five
authors found the method of analysis outlined in the paper differed to that
actually used.
The
Climate Audit blog - run by Canadian Steve McIntyre, who has challenged the
validity of palaeoclimatic temperature reconstructions - claimed credit for
finding the issue with the paper. Professor Karoly said the authors uncovered
the problem before Climate Audit blogged about it.
He said
the data and results were being reviewed.
''This is
a normal part of science,'' he said.
''The
testing of scientific studies through independent analysis of data and methods
strengthens the conclusions. In this study, an issue has been identified and
the results are being rechecked.''
Morton’s “short
article” went to press on June 12, and please do note that date. Why? Well
according to the Karolygate emails, the collapse of the paper’s credibility by
that stage had moved well beyond it being put merely “on hold”.
On June 9 – well
before before Morton was fed that line about it being “on hold”, John Chiang of
Climate Journal, which had accepted the, ahem, peer-reviewed paper and
published an advance copy on its website, wrote a private note to Gergis (emphasis
added at the Billabong):
From: John Chiang [jch_chiang@berkele~eduf
Sent: Saturday, 9 June 2012 9:04AM
To: Joelle Gergis
Cc: John Chiang
Subject: Fwd: Error in our JCU - D- 11-00649 submission
Dear
Joelle: After consulting with the Chief Editor, I have decided to rescind
acceptance of the paper- you'll receive an official email from J Climate to
this effect as soon as we figure out how it should be properly done. I believe the
EOR has already been taken down.
Also,
since it appears that you will have to redo the entire analysis (and
which may result in different conclusions), I will also be requesting that
you withdraw the paper from consideration. Again, you'll hear officially
from J Climate in due course. I invite you to resubmit once the necessary
analyses and changes to the manuscript have been made.
I hope
this will be acceptable to you. I regret the situation, but thank you for bringing
it to my prompt attention.
Best
regards,
John
So, just to recap:
On June 9 the Gergis
paper’s acceptance was rescinded, it was removed from the publication’s website
and its authors instructed to go back to the drawingboard and try harder this
time.
On June 11, Karoly intimates that Morton will do no more than touch on the paper’s troubles and that his
report will be a nothing-to-worry-about “short” report that the paper is merely
on “on hold” when the fact of the matter is that Journal of Climate’s editors had already decided it was dead,
discredited and fit only to be discarded.
One June 12, Morton
fulfils Karoly’s prophecy by dutifully transcribing the stenographic notes of
his exchange, misleading as it was.
How climate scientists
conduct their affairs has received a lot of attention since late in 2009, when
the original Climategate emails surfaced, but the role of their enablers in the
press has gone largely unexamined by the press itself. It is a topic that screams to be explored,
and a splendid local starting point for that inquiry might be the editor’s office at
the Age, where this question or something like it needs to be put to the newspaper’s
environment editor:
“Adam, sorry to
bother you, but do you think you might be too close, and far too sympathetic,
to your fellow believers in global warming? And while we are on the subject,
why didn’t you contact Climate Journal to make sure you weren’t
being spun silly by your mate Karoly?”
The answers might
be very interesting, even allowing for lots of stammering.
A
NOTE: All the Melbourne University emails can
be found here. The specific emails quoted above are all
reproduced in this file.