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The Limnopolar Lake site (A25), of the Circumpolar Active Layer Monitoring-South network (CALM-S), is located on Byers Peninsula, where the activelayer thickness is monitored systematically (by mechanical probing during thethawing season and by temperature devices continuously since 2009). Air,surface, snow and ground temperature devices have been installed to monitorground thermal behavior, which is presented and characterized here. We usethe air and ground mean daily temperature values to define the followingparameters: maximum, minimum and mean temperatures, the zero annual thermalamplitude, and the depth and position of the top of the permafrost table. Thefreezing and thawing seasons (defining their starting dates as well as theirlength) and the existence of zero curtain periods have also been established.We also derive apparent thermal diffusivity and plot thermograms to study thethermal behavior of the ground at different depths and seasons. After thiscomplete thermal characterization of the active layer, we propose thepotential existence of a permafrost table at approximately 130 cm in depthas well as a former transitional layer above it, and discuss the role ofwater in connection with the thermal behavior of the ground during the studyperiod

Thermal characterization of the active layer at the Limnopolar Lake CALM-S site on Byers Peninsula (Livingston Island), Antarctica