www.nytimes.com/2006/07/27/opinion/27doran.html?_r=1&oref=sloginHalf cold & 1/2 warm. Carl:
NY TIMES
Cold, Hard Facts
By PETER DORAN
Published: July 27, 2006
Chicago
IN the debate on global warming, the data on the climate of Antarctica has been
distorted, at different times, by both sides. As a polar researcher caught in
the middle, I’d like to set the record straight.
In January 2002, a research paper about Antarctic temperatures, of which I was
the lead author, appeared in the journal Nature. At the time, the Antarctic
Peninsula was warming, and many people assumed that meant the climate on the
entire continent was heating up, as the Arctic was. But the Antarctic Peninsula
represents only about 15 percent of the continent’s land mass, so it could not
tell the whole story of Antarctic climate. Our paper made the continental
picture more clear.
My research colleagues and I found that from 1986 to 2000, one small, ice-free
area of the Antarctic mainland had actually cooled. Our report also analyzed
temperatures for the mainland in such a way as to remove the influence of the
peninsula warming and found that, from 1966 to 2000, more of the continent had
cooled than had warmed. Our summary statement pointed out how the cooling trend
posed challenges to models of Antarctic climate and ecosystem change.
Newspaper and television reports focused on this part of the paper. And many
news and opinion writers linked our study with another bit of polar research
published that month, in Science, showing that part of Antarctica’s ice sheet
had been thickening — and erroneously concluded that the earth was not warming
at all. “Scientific findings run counter to theory of global warming,” said a
headline on an editorial in The San Diego Union-Tribune. One conservative
commentator wrote, “It’s ironic that two studies suggesting that a new Ice Age
may be under way may end the global warming debate.”
In a rebuttal in The Providence Journal, in Rhode Island, the lead author of the
Science paper and I explained that our studies offered no evidence that the
earth was cooling. But the misinterpretation had already become legend, and in
the four and half years since, it has only grown.
Our results have been misused as “evidence” against global warming by Michael
Crichton in his novel “State of Fear” and by Ann Coulter in her latest book,
“Godless: The Church of Liberalism.” Search my name on the Web, and you will
find pages of links to everything from climate discussion groups to Senate
policy committee documents — all citing my 2002 study as reason to doubt that
the earth is warming. One recent Web column even put words in my mouth. I have
never said that “the unexpected colder climate in Antarctica may possibly be
signaling a lessening of the current global warming cycle.” I have never thought
such a thing either.
Our study did find that 58 percent of Antarctica cooled from 1966 to 2000. But
during that period, the rest of the continent was warming. And climate models
created since our paper was published have suggested a link between the lack of
significant warming in Antarctica and the ozone hole over that continent. These
models, conspicuously missing from the warming-skeptic literature, suggest that
as the ozone hole heals — thanks to worldwide bans on ozone-destroying chemicals
— all of Antarctica is likely to warm with the rest of the planet. An
inconvenient truth?
Also missing from the skeptics’ arguments is the debate over our conclusions.
Another group of researchers who took a different approach found no clear
cooling trend in Antarctica. We still stand by our results for the period we
analyzed, but unbiased reporting would acknowledge differences of scientific
opinion.
The disappointing thing is that we are even debating the direction of climate
change on this globally important continent. And it may not end until we have
more weather stations on Antarctica and longer-term data that demonstrate a
clear trend.
In the meantime, I would like to remove my name from the list of scientists who
dispute global warming. I know my coauthors would as well.
Peter Doran is an associate professor of earth and environmental sciences at the
University of Illinois at Chicago.