For millennia, the Arctic tundra has helped stabilize global temperatures by storing carbon in the frozen ground. Wildfires have changed that, according to the latest Arctic Report Card released yesterday at the American Geophysical Union (AGU) conference.
Fires, intensified by climate change, release carbon trapped in soil and plants. More frequent infernos have now transformed the tundra into a net source of carbon dioxide emissions. It’s a dramatic shift for the Arctic, and one that will make the planet even hotter.
“Climate change is not bringing about a new normal. Instead, climate change is bringing ongoing and rapid change,” Twila Moon, lead editor of the Arctic Report Card and deputy lead scientist at the National Snow and Ice Data Center, said at the conference yesterday.
The Arctic’s permafrost, which stays frozen year-round, has kept planet-heating carbon sequestered for thousands of years. Northern permafrost has been estimated to hold about twice as much carbon as there is in the atmosphere. Tundra describes the Arctic’s tree-less plains, where shrubs, grasses, and mosses grow and take in carbon dioxide through…