Abstract
Snow has been melting earlier in the spring in the Arctic in recent years, and this earlier melting is predicted to persist as the Arctic continues to warm. Some studies have suggested that earlier snowmelt, which can lead to longer growing seasons and increased photosynthetic activity, could help Arctic ecosystems sequester more carbon dioxide (CO2), thus helping to slow global warming. To determine whether this is indeed the case, Humphreys and Lafleur measured CO2 exchange between the tundra and the atmosphere at two sites in central Canada from 2004 to 2010. One site was a wet sedge meadow; the other was mixed upland tundra. (Geophysical Research Letters, doi:10.1029/2011GL047339, 2011)
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