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Mummified forest gives clues about current climate change
December 23rd, 2010
Catholic Online (www.catholic.org)
A recently discovered mummified forest between two and 10 million years old is giving scientists a new opportunity to study climate change. Research scientist Joel Barker at the Byrd Polar Research Center at the Ohio State University discovered the mummified forest in 2009.
LOS ANGELES, CA (Catholic Online) - Barker says that a forest ranger on a remote Island in the Canadian Arctic discovered a stick in the mud in an otherwise barren landscape. "And sure enough there was all this wood debris at the bottom of this valley," Barker says.
The Ellesmere Island is one of about a dozen islands in the Canadian Arctic where warming temperatures and reduced snowfall have caused the glacial ice sheets to retreat and expose land where ancient forests once stood.
What makes this particular forest site unusual was that it was so far north.
"To find the source of where this stuff was coming from was pretty exciting. And then to sort of dig in the soil and find leaves, much like the leaves that you'd find in the Spring sort of emerging from a melting snow pack. They look sort of weathered, but you can pick them up and they are still leaves you are holding in your hands from a couple of million years ago."
Barker says that these mummified trees decompose or turn to stone. He suspects they were buried suddenly by a massive landslide and entombed in the dry, airless soil. "So, you take away water. You take away oxygen. Things get preserved," Barker says.
The ancient forest debris looks much as nature left it. The birch, pine and spruce logs, branches and leaves from long ago are remarkably well-preserved. The mummified woods more closely resemble the trees found in forests now hundreds of miles south.
Ocean sediment cores and the absence of the previously common Metasequoia redwood known to have lived in the region 10 million years ago date the newly-found arctic forest to between two and 10 million years. Barker says the low species diversity is a sign of an ecosystem on the edge of extinction.
"This forest existed at a time when the Arctic was cooling and climate was deteriorating very quickly. And so I think this allows us, by looking at the mummified remains, to see how the ecosystem responded to the cooling, how rapidly the cooling occurred and to maybe identify any thresholds that were reached. And once we identify those thresholds, we can start making predictions about how quickly the ecosystem will respond to future warming."