Lake gas

 作者:胡母簧淮     |      日期:2019-02-27 08:16:00
FROZEN lakes in northern Siberia are emitting methane, a greenhouse gas, that was created more than 27 000 years ago. In April, an international team of researchers collected methane rising from peat sediments in two lakes near Cherskii in Russia. Although the lakes were frozen over, the constant bubbling of the methane had kept channels in the ice open. Carbon dating showed the methane to be 27 200 years old (Science, vol 277, p 800). “The Siberian peats are the oldest peats we know of,” says team member Stanley Tyler of the University of California at Irvine. The lakes’ release of 1.5 billion kilograms of methane each year is unlikely to have a large impact on the greenhouse effect,