Thermal regime and spatial variability of the active layer in Deception Island, Antarctica

• Language: unknown
• Published: 2014
• Subjects: Active layer; Antarctica; Permafrost; South Shetland; Thermal state; air temperature; climate effect; crater lake; lithology; snow cover; solar radiation; spatial variation; thermal regime; topography; wind; Deception Island; South Shetland Islands; Refugio; Crater Lake; Irizar; Irizar Crater; Active layer monitoring; Active layer thickness; Antarc*; permafrost
• Online Access: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v71_n1_p_Goyanes; https://hdl.handle.net/20.500.12110/paper_00044822_v71_n1_p_Goyanes

The Circumpolar Active Layer Monitoring (CALM) program developed over the last two decades has a leading edge in comprehensive efforts to study the impacts of climate change in permafrost environments. This paper describes results obtained during the last six years, on the active layer thickness, thermal regime and spatial patterns of thaw, at the CALM-S Irizar, Crater Lake and Refugio Chileno sites in Deception Island. In Irizar and Refugio Chileno CALM-S sites the active layer depth varied interannually without any clear trend over the short record available. By contrast, Crater Lake CALM-S showed a slight thinning trend. In all sites, the spatial patterns of thaw and active layer thickness were mainly controlled by snow cover conditions, lithology and the effect of aspect on wind. The relief, the detailed topography and the effect of aspect on solar radiation also exert a local control over its patterns. Air temperature and snow cover controlled the thermal state of active layer. In absence of snow, the use of depth penetration model of the 0 °C isotherm allowed approximated satisfactorily active layer thickness.