COMPILATION OF GEOMORPHOLOGICAL MAP FOR RECONSTRUCTING THE DEGLACIATION OF ICE-FREE AREAS IN THE MARTEL INLET, KING GEORGE ISLAND, ANTARCTICA

Autores

  • Kátia Kellem Rosa Universidade Federal da Fronteira Sul, Universidade Federal do Rio Grande do Sul
  • Rosemary Vieira Universidade Federal Fluminense
  • Claudio Wilson Mendes Júnior Universidade Federal do Rio Grande
  • Enoil de Souza Júnior Universidade Federal do Rio Grande do Sul
  • Jefferson Cardia Simões Universidade Federal do Rio Grande do Sul

DOI:

https://doi.org/10.20502/rbg.v14i2.324

Palavras-chave:

retração glacial, geoformas glaciais, evolução da paisagem de áreas sem cobertura de gelo

Resumo

We compiled a geomorphological map and a reconstruction map of glacier extension and ice-free areas in the Martel Inlet, located in King George Island, South Shetlands, Antarctica. Glacier extension data were derived of the digitized over a orthophotomosaic (2003), SPOT (February, 1988; March, 1995 and 2000), Quickbird (October, 2006) and Cosmo-Skymed (February, 2011) images. This mapping was supported by fieldworks carried out in the summers of 2007, 2010 and 2011, and by topographic surveys and geomorphic map in the proglacial area. Several types of glacial deposits were identified in the study area, such as frontal and lateral moraines, flutes, meltwater channels and erosional features like rock moutonnés, striations and U-shaped valleys. These features allowed reconstructing the evolution of the deglaciation environment in the Martel Inlet ice-free areas, which has been affected by a regional climate warming trend. The mapped data indicated the glaciers in study area lost about 0.71 km² of their ice masses (13.2% of the 50.3 km² total area), without any advances during 1979-2011. Since those years these glaciers receded by an average of 25.9 m a-1. These ice-free areas were susceptible to rapid post-depositional changes.

Downloads

Não há dados estatísticos.

Biografia do Autor

Kátia Kellem Rosa, Universidade Federal da Fronteira Sul, Universidade Federal do Rio Grande do Sul

Professora da Universidade Federal da Fronteira Sul. Mestre em Geociências na Universidade Federal do Rio Grande do Sul. Doutoranda no Programa de Pós Graduação de Geociências na UFRGS.

Rosemary Vieira, Universidade Federal Fluminense

Laboratório de Processos Sedimentares e Ambientais

Claudio Wilson Mendes Júnior, Universidade Federal do Rio Grande

Laboratório de Monitoramento da Criosfera

Enoil de Souza Júnior, Universidade Federal do Rio Grande do Sul

Centro Polar e Climático

Jefferson Cardia Simões, Universidade Federal do Rio Grande do Sul

Centro Polar e Climático

Downloads

Publicado

21-03-2013

Como Citar

Rosa, K. K., Vieira, R., Mendes Júnior, C. W., Souza Júnior, E. de, & Simões, J. C. (2013). COMPILATION OF GEOMORPHOLOGICAL MAP FOR RECONSTRUCTING THE DEGLACIATION OF ICE-FREE AREAS IN THE MARTEL INLET, KING GEORGE ISLAND, ANTARCTICA. Revista Brasileira De Geomorfologia, 14(2). https://doi.org/10.20502/rbg.v14i2.324

Edição

Seção

Artigos

Artigos mais lidos pelo mesmo(s) autor(es)

> >>