Role of land-surface changes in arctic summer warming.
Science
; 310(5748): 657-60, 2005 Oct 28.
Article
em En
| MEDLINE
| ID: mdl-16179434
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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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Efeito Estufa
País/Região como assunto:
America do norte
Idioma:
En
Revista:
Science
Ano de publicação:
2005
Tipo de documento:
Article
País de afiliação:
Estados Unidos