A carregar...
Publicação
Interannual active layer variability at the Limnopolar Lake CALM site on Byers Peninsula, Livingston Island, Antarctica
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 780.28 KB | Adobe PDF |
Orientador(es)
Resumo(s)
In order to monitor the evolution of the active layer in the South Shetland Islands, in February
2009 we established a new Circumpolar Active Layer Monitoring (CALM) site in the Limnopolar Lake
basin on Byers Peninsula, Livingston Island. We monitored air, surface and ground (two boreholes of
135 and 80 cm deep) temperatures and Active Layer Thickness (ALT) was measured by mechanical
probing in early February 2009, 2010 and 2011. The mean ALT was 44 cm with a range of about 92 cm, but
where permafrost existed it was deeper than 1.0 m, as could be inferred from the borehole temperatures.
ALT at this site was very dependent on air temperature and snow cover thickness, the ALT spatial
distribution presenting the same pattern as soil penetration resistance, and higher values ALT coinciding
with sites where patterned ground, ponds, and a near surface ground water saturation were observed.
Additionally, ground temperature data provided an excellent tool for understanding the relationship between the
ALT measured during the thaw season and the thermal evolution of the ground throughout the year.
Descrição
Palavras-chave
Climate Hydrology Permafrost South Shetland Islands Temperature
Contexto Educativo
Citação
Pablo, M. A. de, Blanco, J. J., Molina, A., Ramos, M., Quesada, A., & Vieira, G. (2013). Interannual active layer variability at the Limnopolar Lake CALM site on Byers Peninsula, Livingston Island, Antarctica. Antarctic Science, 25(2), 167–180. https://doi.org/10.1017/S0954102012000818
Editora
Cambridge University Press