The greening and browning of Alaska based on 1982–2003 satellite data

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Increased plant growth in the northern high latitudes from 1981 to 1991

R. Myneni, C. D. Keeling, C J Tucker … (1997)

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An extended AVHRR 8-km NDVI dataset compatible with MODIS and SPOT vegetation NDVI data

Compton Tucker, Jorge H. Pinzón, Molly Brown … (2005)

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Role of land-surface changes in arctic summer warming.

F Chapin, M. Sturm, M Serreze … (2005)

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.