Role of land-surface changes in arctic summer warming |
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| Authors: | Chapin F S Sturm M Serreze M C McFadden J P Key J R Lloyd A H McGuire A D Rupp T S Lynch A H Schimel J P Beringer J Chapman W L Epstein H E Euskirchen E S Hinzman L D Jia G Ping C-L Tape K D Thompson C D C Walker D A Welker J M |
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| Institution: | Institute of Arctic Biology; University of Alaska Fairbanks, Fairbanks, AK 99775, USA. terry.chapin@uaf.edu |
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| Abstract: | A major challenge in predicting Earth's future climate state is to understand feedbacks that alter greenhouse-gas forcing. Here we synthesize field data from arctic Alaska, showing that terrestrial changes in summer albedo contribute substantially to recent high-latitude warming trends. Pronounced terrestrial summer warming in arctic Alaska correlates with a lengthening of the snow-free season that has increased atmospheric heating locally by about 3 watts per square meter per decade (similar in magnitude to the regional heating expected over multiple decades from a doubling of atmospheric CO2). The continuation of current trends in shrub and tree expansion could further amplify this atmospheric heating by two to seven times. |
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