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News Bits and Pieces -
June 30, 2005
More than 100 lakes located in an Arctic region of Siberia disappeared during the last 30 years, and scientists say global climate change is the reason.
In a paper published recently in the journal Science, researchers report that 125 lakes originally categorized as large because they were more than 40 hectares (nearly 100 acres) completely disappeared and are now re-vegetated and considered permanently drained. More than 1,000 other large lakes shrank to a smaller size.
“It’s quite significant,” emphasized Yongwei Sheng, a SUNY College of Environmental Science and Forestry (ESF) faculty member who performed remote sensing work on the project. “This is the result of warming and changes in the permafrost. We believe it’s due to global climate change.”
Previous studies have shown that Arctic warming has accelerated since the 1980s.
Prof. Sheng said the lake data raise questions about how altered ecosystems will affect animal habitat, especially for migrating birds that depend on the lakes for water.
Prof. Sheng said the lakes drained, some partially and some completely, because of changes in the permafrost, subsoil which remains frozen throughout the year. “It’s getting warmer there, so some of this material is melting and the lakes are draining,” he said.
The study focused on 624,000 square kilometers (more than 150 million acres). Prof. Sheng said researchers have never before studied the extent of lake changes in such a large section of an Arctic region.
Sheng, now an assistant professor in the Faculty of Environmental Resources and Forest Engineering at SUNY-ESF in Syracuse, N.Y., worked on the project with Larry C. Smith at UCLA.
Satellite images revealed the change in land surface. Prof. Sheng compared images obtained in 1973 by the first land resources satellite used to gather information about geographical formations with images collected in 1997 and 1998. By comparing the two generations of satellite images, the researchers determined the changes in the lakes.
The Virginia Engineer © IIr Associates 2005