【Title】Frozen ground and periglacial processes relationship in temperate high mountains: a case study at Monte Perdido-Tucarroya area (The Pyrenees, Spain)
【Author】SERRANO Enrique1*, LÓPEZ-MORENO Juan Ignacio2, GÓMEZ-LENDE Manuel1, PISABARRO Alfonso1, MARTÍN-MORENO Raúl3, RICO Ibai4, ALONSO-GONZÁLEZ Esteban
【Addresses】1 Dept. of Geography, University of Valladolid, Valladolid 47011, Spain; 2 Dept. of Geoenvironmental Processes and Global Change, Pyrenean Institute of Ecology, Zaragoza 50.080, Spain; 3 Dept. Specific Didactics. Autonom University of Madrid. Madrid, 28049, Spain; 4 Dept. of Geography, Prehistory and Archeology, University of the Basque Country, Vitoria 01006, Spain
【Corresponding author】SERRANO Enrique
【Citation】Serrano E, López-Moreno JI, Gómez-Lende M, et al. (2020) Frozen ground and periglacial processes relationship in temperate high mountains: a case study at Monte Perdido-Tucarroya area (The Pyrenees, Spain). Journal of Mountain Science 17(5). https://doi.org/10.1007s11629-019-5614-5
【Abstract】Seasonally frozen ground, mountain permafrost and cryogenic geomorphological processes are important components of the Pyrenean high mountains. This work presents the results of a study on the distribution of frozen ground in a marginal and paraglacial environment of temperate mountains. An inventory was made of landforms and indicators of frozen ground, and frozen ground was mapped accordingly. During 2014 and 2016 ground temperatures and thermal regimes were monitored, basal temperatures of snow-cover (BTS) were measured and a thermal map was drawn. Differential thermal behaviours were detected among different elevations and slope orientations. Periglacial processes are the most widespread, in which frost weathering and nivation, together with gelifluction and cryoturbation, are the most efficient processes; the latter two are generally linked to the presence of frozen ground. The fall in air and ground temperatures with altitude, slope orientations, and snowpack thickness and evolution determine ground thermal regimes. In the study area, three types of thermal regimes were established: climate-controlled, snowcover-controlled, and frozen ground-controlled. Seasonally frozen ground occurs across a broad range of elevation between 2650 and 3075 m asl, whereas possible permafrost only occurs above 2750 m asl.
【Keywords】Geomorphology; Periglacial; Seasonally frozen ground; Mountain permafrost; Pyrenees