NORWAY: July 31, 2008
OSLO - Arctic sea ice is unlikely to shrink below a 2007 record low this
year in a reprieve from the worst predictions of climate change even though
new evidence confirms a long-term thaw is under way, experts said.
The 2007 record raised worries of a melt that could leave the North Pole
ice-free this year, threaten indigenous hunters and thaw ice vital for
creatures such as polar bears. It would also help open the Arctic to
shipping and oil and gas firms.
"Most likely there will not be a new record minimum ice year in the Arctic
this September," said Ola M. Johannessen of the Nansen Environmental and
Remote Sensing Center in west Norway.
Arctic sea ice area reaches an annual summer low in September but is about 1
million square kms (386,100 sq mile) bigger than at the same time in late
July 2007 at about 6 million sq kms, an area almost as big as Australia.
It is still far smaller than the average of recent decades.
"It's looking rather unlikely that we will beat the record sea ice minimum
of 2007," said Mark Serreze, a senior research fellow at the US National
Snow and Ice Data Center (NSIDC), adding there could still be surprises.
"The North Pole is likely safe for at least this year," he said. The NSIDC
had suggested in May that it was "quite possible" that the pole could be
ice-free this year.
"The basic reason that while last summer saw an ideal atmospheric pattern
for melting sea ice -- essentially a "perfect storm" -- the pattern so far
this summer has been characterized by somewhat cooler conditions," he said.
The 2007 low area of 4.13 million sq kms shattered a 2005 record and was
among factors adding pressure on governments to slow a build-up of
greenhouse gases from factories, power plants and cars. Governments have
agreed to negotiate a new climate treaty by the end of 2009 to succeed the
UN's Kyoto Protocol.
GASES RISE, ICE SHRINKS
Johannessen gave Reuters a hitherto unpublished study showing there was a 90
percent match between rising greenhouse gas emissions, mainly from use of
fossil fuels, in recent decades and observations of a retreat of the ice.
"Ninety percent ... of the decreasing sea-ice extent is empirically
'accounted for' by the increasing carbon dioxide in the atmosphere," he
wrote in the study, to be published next month in a journal by the Chinese
Academy of Sciences.
If the match continues to hold true, the annual average ice extent would be
several million km smaller by 2050 than predicted by the UN Climate Panel,
which draws on the work of 2,500 scientists, it said.
Serreze said that he stood by a prediction that the Arctic Ocean could be
ice-free in summer by 2030, decades before predictions by the Panel.
The Arctic has been warming about twice as fast as the rest of the globe in
recent decades. Ice and snow reflect heat and any thaw uncovers darker
ground or sea water that soak up the sun's warmth and further accelerate the
melt.
Sheldon Drobot of the Colorado Center for Astrodymanics Research (CCAR), who
predicted in April that there was a roughly 60 percent chance of a record
2008 Arctic melt, said he had cut chances to 40 percent and would probably
revise them down again.
"Spring and summer temperatures in the Siberian coastal area are several
degrees Celsius cooler in 2008 as compared to 2007," he said. "I am highly
sceptical that we'll see an ice-free North Pole this year."
"Wind patterns that tend to push ice to the north have been mostly lacking
this year," said James Maslanik, also at CCAR.
-- For Reuters latest environment blogs click on: http://blogs.reuters.com/environment/
(Editing by Peter Millership)
Story by Alister Doyle, Environment Correspondent
REUTERS NEWS SERVICE
