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Ice age to interglacial period: Greatest
climate change
Wednesday July 25, 2012 09:02:05 AM, IANS
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Copenhagen: The
greatest climate change ever recorded by the world over the last
100,000 years has been the transition from the ice age to the warm
interglacial period.
New research from the Niels Bohr Institute at the University of
Copenhagen indicates that, contrary to previous opinion, the rise
in temperature and the rise in the atmospheric carbon dioxide
(CO2) follow each other closely in terms of time.
In the warmer climate, the atmospheric content of CO2 is naturally
higher. CO2 is a green-house gas that absorbs heat radiation from
the Earth and thus keeps the planet warm. In the shift between ice
ages and interglacial periods the atmospheric content of CO2 helps
to intensify the natural climate variations, the journal Climate
of the Past reports.
It had previously been thought that as the temperature began to
rise at the end of the ice age approximately 19,000 years ago, an
increase in the amount of CO2 in the atmosphere followed with a
delay of up to 1,000 years, according to a Copenhagen statement.
"Our analyses of ice cores from the ice sheet in Antarctica shows
that the concentration of CO2 in the atmosphere follows the rise
in Antarctic temperatures very closely and is staggered by a few
hundred years at most," explains Sune Olander Rasmussen, associate
professor and centre coordinator at the Centre for Ice and Climate
at the Niels Bohr Institute at the University of Copenhagen.
The research, which was carried out in collaboration with the
University of Tasmania, Australia, is based on measurements of ice
cores from five boreholes through the ice sheet in Antarctica. The
ice sheet is formed by snow that doesn't melt, but remains year
after year and is gradually compressed into kilometres-thick ice.
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