Portal de Periódicos da CAPES

Artigo Acesso aberto Produção Nacional Revisado por pares

BIBTEX RIS

Active layer and permafrost thermal regimes in the ice-free areas of Antarctica

2023; Elsevier BV; Volume: 242; Linguagem: Inglês

10.1016/j.earscirev.2023.104458

1872-6828

Filip Hrbáček, Marc Oliva, Christel Hansen, Megan R. Balks, Tanya O’Neill, Miguel Ángel de Pablo Hernández, Stefano Ponti, Miguel Ramos, Gonçalo Vieira, Andrey Abramov, Lucia Kaplan Pastíriková, Mauro Guglielmin, Gabriel Goyanes, Márcio Rocha Francelino, Carlos Ernesto Gonçalves Reynaud Schaefer, Denis Lacelle,

Cryospheric studies and observations

Ice-free areas occupy 5 m in bedrock sites in the Antarctic Peninsula. The deepest and most variable ALTs (ca. 40 to >500 cm) were found in the Antarctic Peninsula, whereas the maximum ALT generally did not exceed 90 cm in Victoria Land and East Antarctica. Notably, found that the mean annual near-surface temperature follows the latitudinal gradient of −0.9 °C/deg. (R2 = 0.9) and the active layer thickness 3.7 cm/deg. (R2 = 0.64). The continuous permafrost occurs in the vast majority of the ice-free areas in Antarctica. The modelling of temperature on the top of the permafrost indicates also the permafrost presence in South Orkneys and South Georgia. The only areas where deep boreholes and geophysical surveys indicates discontinuous or sporadic permafrost are South Shetlands and Western Antarctic Peninsula.