Detecção de Mudanças Ambientais na Antártica através de Dados de Sensoriamento Remoto e Mapas Históricos

JORGE ARIGONY NETO, JEFERSON CARDIA SIMÕES, ULISSES FRANZ BREMER, FRANCISCO ELISEU AQUINO

Resumo


Ice masses in the South Shetland Islands, Antarctica, are relatively thin and near or at the melting pressure point. They are, therefore, very sensitive to climatic variations. This work discusses glaciers retreat observed since 1950s in the Antarctic Specially Managed Area (ASMA) of Admiralty Bay in King George Island. From 1956 to 1979 this area lost 4.3 km2 (2%) of its ice cover. Further 4.9 km2 disappeared (10% of the original ice cover, i.e. in 1956). The ice retreat magnitude in this period cannot be attributed to in-built variations of the glacier system. Further, it is associated to similar glaciers retractions and ice shelves collapses in the northern most part of the Antarctic Peninsula. Probably this general ice retreat results from or is enhanced by the atmospheric warming recorded for the region since 1940s.


Palavras-chave


glacier retreat; King George Island; Antartica.

Texto completo:

PDF/A


DOI: https://doi.org/10.22456/1807-9806.20307

Apontamentos

  • Não há apontamentos.







Instituto de Geociências, Universidade Federal do Rio Grande do Sul
Av. Bento Gonçalves, 9500 - Prédio 43113
91.540-000, Porto Alegre, RS, Brasil
E-mail: pesqgeoc@ufrgs.br