Alaskan tundra reveals climate warming increase
Print Edition
THE Alaskan tundra appears to be emitting more carbon dioxide than it captures, a dynamic that could accelerate climate warming as vast stores of CO2 trapped in Arctic soils are unlocked by rising temperatures.
Data gathered by the National Oceanographic and Atmospheric Administration showed a 73 percent rise in CO2 between 1975 and 2015 during that October to December period, says a study by Roisin Commane of Harvard University.
Their findings support the view that rising temperatures have made Arctic ecosystems a net source of CO2.
It raises a question to what extent the increase is from the decomposition of ancient vegetation trapped for decades or even centuries in the permafrost, and now being exposed to the atmosphere. The researchers estimate the Arctic permafrost contains more CO2 than the Earth’s atmosphere.
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