Drill cores taken from Greenland’s vast ice sheets show that Earth’s climate is capable of very rapid transitions and abrupt climate change.
“Such evidence comes from the accumulation of layers of ancient snow, which compact to form the ice-sheets we see today,” says this article in Science Daily. “Each layer of ice can reveal past temperatures and even evidence for the timing and magnitude of distant storms or volcanic eruptions.”
Climate reconstruction by an international team of scientists led by Dr Stephen Barker of Cardiff University, used ice core records retrieved from Antarctica to extend the Greenland record over the past 800,000 years.
The research, published in the journal Science on September 8, 2011, demonstrates that abrupt climate change has been a systemic feature of Earth’s climate for hundreds of thousands of years and may play an active role in longer term climate variability through its influence on ice age terminations.
This work extends my own research, because not only do ice ages end abruptly, I show that every ice age during the past 250,000 years began with a bang.
At the end of the Eemian Period, the climate descended from a time of warmth even warmer than today into full-blown glaciation in less than 20 years.
Electrical conductivity tests show that some transitions from warmth to cold occurred in only three years. (Not by Fire but by Ice, p 187-188)
Let’s remember that these abrupt transitions occurred without any help from us nasty humans.
See entire article:
Thanks to David Bronzich for this link
Also see Science magazine, 8 Sep 11,
“800,000 Years of Abrupt Climate Variability”: